VARDHAMAN COLLEGE OF ENGINEERING€¦ · embedded computing system. 8M b) Explain the major...

Hall Ticket No: Question Paper Code : A1430

VARDHAMAN COLLEGE OF ENGINEERING (AUTONOMOUS)

B. Tech VI Semester Regular/Supplementary Examinations, April - 2016 (Regulations: VCE-R11/R11A)

EMBEDDED SYSTEMS (Common to Computer Science and Engineering & Information Technology)

Date: 21 April, 2016 Time: 3 hours Max Marks: 75

Answer ONE question from each Unit All Questions Carry Equal Marks

Unit - I 1. a) List and explain what are the challenges need to be consider while designing an

embedded computing system. 8M

b) Explain the major abstraction levels in the embedded system design process.

7M

2. a) Explain the types of relationship that can exist between objects and classes. 7M b) Illustrate the use of UML to model system, with the help of model train controller.

8M

Unit - II 3. a) With an example explain the data transfer and logical instructions in 8051uc. 8M b) Write an Assembly language program to find the smallest among given 5 numbers.

7M

4. a) Write an 8051 assembly program to transmit the message “VCE” serially at 9600 baud, 8bit data, 1 slip bit.

8M

b) Differentiate between JMP and Call instruction. Explain with suitable examples the different ranges associated with call instructions.

7M

Unit - III 5. a) Explain the concept of semaphores. Discuss how it helps in solving shared data problem

in embedded system. 8M

b) Describe Round Robin architecture with an example.

7M

6. a) Explain the methods to save power and memory. 7M b) Explain how a separate Task helps control shared hardware taking printer as example.

8M

Unit - IV 7. a) Explain how the Linker/Locators use segment to decide where to put different parts of

the code and data. 7M

b) Briefly explain the debugging techniques employed in embedded systems.

8M

8. a) Discuss the goals of typical testing process and explain the basic method for testing the embedded software on the development host with the help of neat figure showing the Test System.

8M

b) What is Logical Analyzer? Explain the working, features and uses of Logical Analyzer with a neat sketch.

7M

Unit - V 9. a) What is the difference between the Harvard and von Neumann architectures, CISC and

RISC? 8M

b) Explain briefly any two network embedded system protocols.

7M

10. a) Write short notes on I2C and Internet Enabled systems. 8M b) With an example explain different addressing modes in ARM processor. 7M

Hall Ticket No: Question Paper Code: A1607

VARDHAMAN COLLEGE OF ENGINEERING

(AUTONOMOUS) B. Tech VI Semester Regular/Supplementary Examinations, April - 2016

(Regulations: VCE-R11/R11A)

NETWORK SECURITY AND CRYPTOGRAPHY

(Computer Science and Engineering)



Unit – I

1. a) By using Playfair cipher technique, find the cipher text for the following message: Plain

text = substitution cipher, Key = COMPUTER SCIENCE. 7M

b) How steganography differs from cryptography? Explain different steganographic forms, also list their merits and demerits.

8M

2. a) What is computer security? Define security ‘services’, ‘attacks’ and ‘mechanisms’. 7M

b) Encrypt the message COMPUTER using the Hill cipher with the key

7549

Show how Hill cipher succumbs to a known plaintext attack with the help of plaintext-ciphertext pairs obtained.

8M

Unit – II

3. a) Briefly explain the principles of block cipher. With schematic diagram explain the single round of DES encryption algorithm.

7M

b) How round keys are generated for each round of AES algorithm? Describe in detail the key expansion process.

8M

4. a) What are the problems associated with Electronic Codebook(ECB) mode of block cipher operation? How are they overcome in Cipher Block chaining (CBC) mode? Explain encryption and decryption operations of CBC mode along with expressions.

7M

b) i. Explain the Feistel Cipher with the block diagrams ii. Apply Feistel algorithm to prove that LD2 = RE14 and RD2 = LE14 Assume suitable

data

8M

Unit – III

5. a) Write key generation steps in RSA algorithm. In a public-key crypto system using RSA, you intercept the ciphertext C=25 sent to a user whose public key is e =7, n =35. What is the plaintext M?

7M

b) Along with the key-exchange protocol, explain diffie-Hellman key computation technique. Show how this protocol is vulnerable to Man-in-the-Middle attack.

8M

6. a) With a necessary block schematic, describe how hash value is computed in SHA algorithm.

7M

b) Along with public and private components used, write the DSA algorithm for signing and verification.

8M

Cont…2

:: 2 ::

Unit – IV

7. a) Describe the X.509 certificate format. 7M b) What is the significance of defining Cryptographic Message System (CMS) to MIME

content types? Describe signed data content type and Enveloped data content type used in S/MIME.

8M

8. a) What is meant by PGP? Explain the general format of PGP message. 7M b) How the access to a server is authenticated using Kerberos?

8M

Unit – V

9. a) Draw the SSL protocol stack and briefly explain the two important concepts of SSL. 7M b) What is the need for dual signature in SET? How are they constructed?

8M

10. a) What is a firewall? What are its characteristics? 7M b) What is a virus? List the phases through which a virus goes through. Also list the

approaches to antivirus software? 8M





LANGUAGE PROCESSORS

(Common to Computer Science and Engineering & Information Technology)

Date: 27 April, 2016 FN Time: 3 hours Max Marks: 75


Unit - I 1. a) Consider the declaration.

float i=1,j; int k=8; Demonstrate with explanation about each compiler phase operations and show the symbol table contents for the expression j=(i+k)*(i+k).

9M

b) Perform the Left recursion elimination and left factoring for the following grammars respectively: i. rexprrexpr + rterm | rterm

rtermrtermrfactor | rfactor rfactorrfactor * | rprimary rprimary a | b

ii. stmt if expr then stmt else stmt | if stmt then stmt | begin stmtlist end stmtliststmt; stmtlist | stmt

6M

2. a) Check whether the given grammar is LL(1) grammar or not: S 0 | A A AB | B1

8M

b) How will the compiler deal with errors in lexical analysis phase and perform the recovery? Analyze about each strategy by giving appropriate examples.

7M

Unit - II 3. a) What is handle pruning? Explain the conflicts during shift-reduce parsing. 6M b) Define augmented grammar. Construct an SLR parser for the following grammar:

S CC C cC C d

9M

4. a) Show shift reduce parsing for the input “aaa*a++”, using the given grammar. Validate the given input is right or wrong: G: SSS+ | SS* | a

6M

b) Construct the LR(1) items for CLR Parser for the given grammar: G: SS(S) S

9M

Cont…2

::2::

Unit - III 5. a) Write a grammar with Semantic rules to recognize logical expressions of C program. Show

the annotated parse tree, dependency graph and topological sorting for the following valid input string:((0&&1)|| 1 ).

7M

b) What are synthesized and inherited attributes? Construct annotated parse tree for the input string 5*6+7.

8M

6. a) What are the common three address instruction forms? Show any 8 of them with examples for each one of them.

8M

b) Using the translation scheme for Boolean expressions, translate the following expression: i. (a<b || a>c || a!=d) ii. (a==b&&b==g&& j==k)

7M

Unit - IV 7. a) With examples, explain the following :

i. Type systems ii. Type expressions

10M

b) Explain error recovery in type checking.

5M

8. a) With a diagram, explain typical subdivision of run-time memory into code and data areas.

8M

b) int sum ( int arr[], int n ) int result = 0 ; if ( n == 0 ) result += arr[ n ] ; return result ; else result += arr[ n ] ; sum( arr, n - 1 ) ; The above code is to find the sum of the elements in an array. Show the complete activation tree for sum (b, 5).What does the stack and its activation records look like when sum(b,0) is about to return? Determine all the calling and return sequences for the given function call sum(b,5). Consider the array is declared as int b[10]=1,2,3,4,5,6.

7M

Unit - V 9. a) Explain the following :

i. Code motion ii. Common sub expressions iii. Copy propagation iv. Dead-code elimination

12M

b) Explain the optimization of basic blocks.

3M 10. a) Explain the following issues in code generation:

i. Target program ii. Input to the code generator iii. Register allocation

9M

b) Formulate optimal machine code sequence for the given expression: G=(a*a+2*a*b+b*b)

6M





OBJECT ORIENTED DESIGN AND PATTERNS




Unit - I 1. a) Bring out differences between:

i. Class and Use case diagrams ii. State and activity diagrams

5M

b) Draw a class diagram for each group of classes: school, playground, principal, school board, classroom book, student, teacher, cafeteria, restroom, computer, desk, chair, ruler, door, swing. Add associations and generalizations and show multiplicity wherever it is applicable.

10M

2. a) Write guidelines to model different views of a system and different levels of abstraction.

5M

b) Explain the following terms with suitable examples and UML notations: i. Generalization ii. Aggregation iii. Multiplicity

10M

Unit - II 3. a) Illustrate the process of identifying classes and responsibilities from a functional

description using a suitable example. 8M

b) Write UML notations for Class diagram. Draw a class diagram for the following scenario: The commercial bank wants keep track of the customer’s information. The each customer will have exactly one account and account can be shared by any number of customers. The customer can take any number of loans from the bank and system will also keep track of the date of last transaction. We store the following details: i. Account: unique account-number, type and balance ii. Customer: unique customer-id, name and several addresses composed of

street, city and state iii. Loan: unique loan-number, type and amount

7M

4. a) What do you mean by class? State and explain three common relationships among classes.

8M

b) What are key elements of a sequence diagram? Explain them with UML notations. Write sequence diagram for leaving a message of voice mail system example.

7M

Unit - III 5. a) What is the importance of encapsulation? How do you enforce encapsulation

using accessor and mutator? List the accessor and mutator of date class. 8M

b) What is the significance of polymorphism? Discuss with suitable example and code segment.

7M

6. a) State and explain different criterias used to analyze the quality of the interface of a class.

8M

b) How user interface actions are performed by ActionListener interface type? Write a program to implement the ActionListener interface type to Timer class in order to set up to notify a listener once per second.

7M

Cont…2

::2::

Unit - IV

7. a) Explain the model view controller architecture. Draw a sequence diagram to show an appropriate action of the model.

10M

b) Illustrate putting patterns to work with an example.

5M

8. a) Explain the inheritance diagram of Swing component classes. Also explain each component class.

8M

b) What is an abstract class? Differentiate between abstract class and interface.

7M

Unit - V 9. a) What do you mean by framework? Discuss an overview of collections framework

with an example. 7M

b) Explain the context and solutions of command pattern with suitable class diagram.

8M

10. a) Explain with appropriate pattern with a class diagram, how a system can instantiate classes that are not known when the system is built.

8M

b) Explain the context and solutions of visitor pattern with suitable class diagram. 7M



(AUTONOMOUS) B. Tech VI Semester Regular/Supplementary Examinations, April/May - 2016


C# AND .NET FRAMEWORK


Date: 02 May, 2016 Time: 3 hours Max Marks: 75


Unit - I 1. a) List and explain the various solutions provided by .NET framework for application

development. 6M

b) Explain the different options of C# compiler csc.exe along with usage for application development.

9M

2. a) With suitable code explain how namespaces are accessed programmatically. 6M b) Explain with suitable diagram the working of Common Language Runtime in .NET

framework.

9M

Unit - II 3. a) Explain the Method Parameter modifiers. Demonstrate each modifier with an

Example. 7M

b) When interacting with databases the columns in a data table may be empty, provide a C# data type to handle the same.

8M

4. a) List and explain the String format character and Access Modifiers available in C#. 5M b) Create a namespace “StudentNamespace” for Student where marks is entered

and another namespace “CGPANamespace” for assigning the cgpa. Use both the namespace to display the student marks and cgpa.

10M

Unit - III 5. a) Define Interface. Write a program to demonstrate multiple base class type of

inheritance in C# language. 8M

b) Explain the various methods and properties of System exception class.

7M

6. a) Write a program to demonstrate Explicit casting, “is” and “as” keywords for invoking methods of base class.

8M

b) Write a program to demonstrate handling of multiple exceptions in C#.

7M

Unit - IV 7. a) A delegate type maintains three important pieces of information. Briefly explain. 5M b) List and explain the .NET assemblies elements.

10M

8. a) With a neat illustration, explain the digital signature generation and embedding into the assembly based in part on public and private key data.

8M

b) Explain <codebase> element and System. Configuration namespace.

7M

Unit - V 9. a) List and explain the core objects of ADO.NET data provider present in

System.Data.Common namespace. 8M

b) With syntax explain the various functions of DbProviderFactory class.

7M

10. a) Define Data Adapter Object. Explain with a neat diagram the features of data Adapter object.

8M

b) Define Dataset. Explain any four methods and properties of System.Data.Dataset class.

7M



B. Tech VI Semester Regular/Supplementary Examinations, April/May - 2016 (Regulations: VCE-R11/R11A)

ENTREPRENEURSHIP (Common to Computer Science and Engineering, Information Technology &

Electronics and Communication Engineering) Date: 04 May, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) What is entrepreneurship? Explain its importance. 8M b) What are the different stimulants to entrepreneurship? How would you guard against

the stimulants creating barriers?

7M

2. a) What is the role of entrepreneurship in the economic development of a country? 6M b) Discuss various theories of entrepreneurship.

9M

Unit – II

3. a) Write short notes on: i. SISI ii. SIDBI

8M

b) Define MSME’s and explain its role in the economic development of a country.

7M

4. a) Elaborate on the Government policies towards entrepreneurship development. 8M b) Explain the role of DIC in the development of entrepreneurship.

7M

Unit – III

5. a) Explain the characteristics of women entrepreneurs. 10M b) Explain the problems faced by women entrepreneurs.

5M

6. a) Do you think that Indian women entrepreneurs are better contributors to economy in their host country?

7M

b) Explain the importance of women entrepreneurship.

8M

Unit – IV

7. a) How does project planning help an entrepreneur in his/her business? 8M b) What is social cost benefit analysis?

7M

8. a) What are the steps involved in project Management. 8M b) Explain Project appraisal and project financing.

7M

Unit – V

9. a) Explain the necessity of designing an appropriate training program to promote entrepreneurship.

8M

b) Explain the significance of entrepreneurial training.

7M

10. a) Explain the different ways of training for new and existing entrepreneurs. 8M b) Explain the need of feedback and performance analysis of trainees. 7M




WIRELESS AND MOBILE COMPUTING (Information Technology)



Unit - I 1. a) Mention any three problems do customers of a satellite system with mobile phones

face if they are using it in big cities. 9M

b) Mention and discuss the following design goals with respect to WLANs: i. Robust transmission technology ii. Transparency for applications iii. Safety and security

6M

2. a) Define infrastructure-based wireless networks. With a block diagram, discuss various issues pertaining to these networks.

7M

b) Write the system architecture of IEEE 802.11 standard. Discuss various components.

8M

Unit - II 3. a) Interpret protocol architecture for signaling in GSM. 8M b) Explain integration of teleservices, bearer services and supplementary services in GSM

Systems?

7M

4. a) Describe types of handover procedures in GSM and all possible scenarios. 8M b) Write complete GPRS architecture reference model and GPRS transmission plan

protocol reference model.

7M

Unit - III 5. a) With a neat block diagram, discuss the process of packet delivery to and from the

mobile node. 6M

b) Discuss two different ways of mobile node registration along with the packet formats used for registration request and reply.

9M

6. a) How DHCP is used for mobility and support of mobile IP? 6M b) Compare traditional TCP, Indirect TCP, mobile TCP with respect to congestion handling

and packet losses.

9M

Unit - IV 7. a) With an illustration, discuss the applications of push–based data dissemination

mechanism. 8M

b) Define context–aware computing. List and discuss some of the essential context parameters used while developing context-aware applications.

7M

8. a) Define Hoarding. Explain the technique of incremental data hoarding. 7M b) Why quality of service should be taken care in data management? Discuss in detail.

8M

Unit - V 9. a) Discuss the important components of J2ME environment. 8M b) Discuss in detail WAE in WAP 1.1.

7M

10. a) Discuss various security features supported in WTLS protocol. 9M b) With a neat diagram, discuss the application of master-slave communication model in

a piconet setup using Bluetooth devices. 6M

Hall Ticket No: Question Paper Code:

A1515



COMPUTER NETWORKS

(Electronics and Communication Engineering)



Unit – I

1. a) Explain the OSI reference model with a neat diagram. 10M b) What are the difference between connection oriented and connectionless networks?

Explain.

5M

2. a) List and explain the advantages of fiber optics over copper wire. 6M b) What are different multiplexing schemes available? Explain with the help of diagram.

9M

Unit – II

3. a) List the features of Point to point protocol. With the frame format explain the point to point full frame format for unnumbered mode of operation.

7M

b) A bit stream 1101011 is transmitted using the standard CRC method. The generator polynomial is G(x)=x4+x+1. Show the actual bit string transmitted. Suppose the third bit from the left is inverted during transmission. Show that the error is detected at receiver end.

8M

4. a) List distribution and station services provided by wireless LAN according to 802.1 standards. Explain all station services.

7M

b) A large population of ALOHA users manages to generate 50 requests/sec, including both originals and retransmissions. Time is slotted in units of 40msec: i. What is the chance of success on the first attempt ii. What is the probability of exactly k collisions and then a success iii. What is the expected number of transmission attempts needed

8M

Unit – III

5. a) List and explain the desirable properties of a routing algorithm. 7M b) The CPU router can process 2million packets/sec. the load offered to it is 1.5million

packets/sec. if the router from source to destination contains 10routers, how much time is spent being queued and serviced by the CPU?

8M

6. a) Explain the techniques used for achieving good quality of service. 7M b) Consider the network shown in Fig.1. Compute the shortest path between routers A

and D using the shortest path routing algorithm showing all the necessary steps:

Fig.1

8M

Cont…2

:: 2 ::

Unit – IV

7. a) What is remote procedure call? Explain how it works. 7M b) With the neat timing diagram discuss four protocol scenarios for releasing the

connection.

8M

8. a) With an example explain window management in TCP. 8M b) Suppose that the TCP congestion window is set to 18KB and timeout occurs. How big

will the window be if the next four transmission bursts are all successful? Assume that the maximum segment size is 1KB.

7M

Unit – V

9. a) Explain the principal DNS resource record types for IPv4. 7M b) Discuss RFC 822 header fields related to message transport.

8M

10. a) Give the format of HTTP Request and response methods. 5M b) Give the Architectural lay out of the Electronic mail (E-mail). In email what is the

functionality of the User Agent (UA) and Message Transfer Agent (MTA)? 10M




MICROPROCESSORS AND INTERFACING (Common to Electronics and Communication Engineering &

Electrical and Electronics Engineering) Date: 25 April, 2016 Time: 3 hours Max Marks: 75


Unit – I 1. a) List the features of 8086 microprocessor considering the architecture of 8086. 7M b) Given BX=5BECH, SI=3A93H, CX=2012H, DI=3356H, displacement=5719H and

DS=2100H, determine the effective address and addressing mode of the following instructions: i. MOV AX, (SI+8) ii. JMP (BX+DI) iii. LEA BX, displacement iv. ROL BX, CL

8M

2. a) Describe about various addressing modes. List and explain the categories of addressing modes with examples.

7M

b) How following signal lines work? Explain: i. BHE/S7 ii. TEST iii. LOCK iv. DEN

8M

Unit – II

3. a) What is the function of assembler directives? Briefly explain assembler directives like EXTRN, OFFSET, PROC, EQU and PUBLIC.

8M

b) Write an assembly language program to find the average of ‘N’ 16-bit unsigned integers.

7M

4. a) Distinguish between procedures and macros. 7M b) Write an ALP to find the GCD of two 16-bit unsigned integers.

8M

Unit – III

5. a) Design an interface between 8086 and two chips of each 32K8 EPROM and 32K8 RAM. Select the starting address of EPROM suitably. The RAM address must start at 00000H. Use 74138 for decoding.

8M

b) Interface D/A converter to 8086 through 8255 and write an assembly language program to generate square wave of frequency 1KHz, magnitude of 5V.

7M

6. a) Interface a stepper motor controller and write an ALP to rotate the shaft of stepper motor clockwise one rotation.

7M

b) Explain in brief various modes of operation of 8255 (PPI). 8M

Unit – IV

7. a) Explain with the help of block diagram of 8259 and explain the initialization sequence of the same.

8M

b) Describe and explain the maximum mode operation of 8086 microprocessor. 7M Cont…2

:: 2 ::

8. a) Briefly describe the conditions which cause the 8086 to perform each of the

following types of interrupts: Type0 to Type3. 8M

b) Draw the functional block diagram of Intel 8257 DMA controller and also explain the initialization process. What is the main purpose of DMA Controller?

7M

Unit – V

9. a) Differentiate between synchronous and asynchronous data transfer schemes with examples.

8M

b) Explain how 80286 can be used in protected mode to do the operations.

7M

10. a) Explain in brief, the addressing in protected mode of 80386 microprocessor. 8M b) Design the hardware interface circuit for interfacing 8251 with 8086. Set the

8251 in asynchronous mode as a transmitter and receiver with even parity enabled, 2 stop bits, 8 bit character length, frequency 160KHz and baud rate 10K. Write the required control word format.

7M





DIGITAL COMMUNICATIONS


Date: 27 April, 2016 Time: 3 hours Max Marks: 75 Answer ONE question from each Unit

All Questions Carry Equal Marks

Unit – I

1. a) Explain how Differential PCM (DPCM) transmission and reception is done for audio coding and its advantage over standard PCM.

9M

b) In DM system, voice signal is sampled at rate of 32,000samples/sec. The maximum signal amplitude Am=2v. i. Determine minimum value of step size required to avoid slope overload ii. Determine quantisation noise power if voice signal bandwidth is 4 kHz iii. Determine SNR required

6M

2. a) State the limitation of delta modulation and explain how ADM helps to overcome these errors.

7M

b) State the need for non- uniform quantisation in PCM system. A compact disc CD recording system samples each of two stereo signals with 16bit ADC at 44.1kbps: i. Determine output SNR for full scale sinusoid ii. Bit stream is now added with error correcting bits, clock extraction bits, control bits These additional bits amounts 100 % overhead. Determine bit rate of this system.

8M

Unit – II

3. a) With neat block diagram explain generation and reception of BPSK signal with constellation diagram and write expression for Pe.

8M

b) Binary data is transmitted over a microwave link at a rate of 10Mbps and PSD of noise is 10-10watts/hz. Find average carrier power required to maintain average Pe <= 10-4 for coherent BFSK. What is required BW?

7M

4. a) Explain importance of eyepattern in analyzing ISI. 7M b) What are the practical difficulties in implementing an ideal Nyquist low pass filter for

eliminating ISI? What is practical pulse shaping method employed.

8M

Unit – III

5. a) Find the relationship between Hartleys, nats and bits. 7M b) A code is composed of dots and dashes. Assuming that a dash is 3 times as long as dot

and has one third the probability of occurrence. Calculate: i. The information in a dot and in a dash ii. The entropy of dot-dash code iii. The average rate of information dot lasts fpr 10msec and this time is allowed

between the symbols

8M

6. a) State and explain properties of Entropy. 8M b) A source emits one of the four probable messages m1, m2, m3 and m4 with probabilities

of 7/16, 5/16, 1/8 and 1/8 respectively. Find the entropy of the source and show that H(S2)=2H(S).

7M

Cont…2

:: 2 ::

Unit – IV

7. a) Comment on the number of error detectability and correctability of block codes. 10M b) The parity check matrix of particular (7, 4) linear block code is:

1 1 1 0 1 0 0

H = 1 1 0 1 0 1 01 0 1 1 0 0 1

i. Find generator matrix ii. All possible code vectors

5M

8. a) What are advantages and drawbacks of cyclic codes? 6M b) Draw the encoder and syndrome calculator for generator polynomial g(x)=1+x2+x3, for

received codeword 1001011.

9M

Unit – V

9. a) Define the term code rate, impulse response and polynomial generators of encoder. 5M b) For the convolution encoder with generator g1=[1, 1, 0], g2=[1, 0, 1], g3=[1, 1, 1]draw

the encoder, trellis, state diagram. Find encoder output code for input message m=[1 0 0 1 1].

10M

10. a) Write note on use of trellis diagram for viterbi decoding. 7M b) For the convolution encoder with g1=[10 0], g2=[1 0 1]and g3=[1 1 1], draw state

diagram and output code word in transform domain approach for message u=[1 0 0 1 0].

8M





DIGITAL SIGNAL PROCESSING




Unit – I

1. a) For the following system illustrate whether the system is Linear, Time invariant, Memory, causal and stable: i. y n g n x n ii. 2y n x n

iii.

n

nkkxny

0

)(][

iv. 2ny n x

8M

b) An LTI system is characterized by n3

4h n = u n .

compute the output of the system at

time n=5,-5,10, when input x n =u n .

7M

2. a) Given nx n =α u n -u n-10 and nh n =β u n . Determine the response of a system using convolution sum for the condition 0<α<1 and 0<β<1.

8M

b) Solve the difference equation y n +3y n-1 =x n with x n =u n and the initial condition y(-1)=1.

7M

Unit – II

3. a) Determine the Discrete Time Fourier Series of the signal nx n = -1 ; - <n< . Also plot its magnitude and phase spectrum.

7M

b) State and prove the following properties of DFT: i. Circular time shift ii. Circular convolution

8M

4. a) Compute 8 point DFT of the sequence x n = 1 for 0 7n and x n =0 otherwise Using decimation in time FFT algorithm.

10M

b) Given 1x n = 1, -1, 1 and 2x n = 2, 2, 2 Compute the linear convolution.

5M

Unit – III

5. a) A causal system has input x(n) and output y n . Find the impulse response of the system if:

1 1x n =δ n + δ n-1 - δ n-24 8

3y n =δ n - δ n-14

8M

Cont….2

:: 2 ::

b) Draw the Direct Form-I and Direct Form-II implementation of the system:

1 2 0 1 2 3y n +a y n-1 +a y n-2 =b x n +b x n-1 +b x n-2 +b x n-3 .

7M

6. a) Determine the cascade realization for the system described by the system function:

-1 -1

-1 -1 -2

21+z 1-1.0166z +zH z =0.05634

1-0.683 z 1-1.446 z -0.7957 z

8M

b) Determine the Z-transform and sketch the ROC of:

i. n1x(n)=-u(-n-1)+ u(n)

2

ii. nx n =α u n

7M

Unit – IV

7. a) A lowpass filter has the desired frequency response:

-j3wiwd

πH e =e ,0<w<2

π=0, <w<2

Determine h n using Hanning window technique. Take N=7.

8M

b) The frequency response of an FIR filter is given by

jw -j3wH e =e 1+1.8cos 3w +1.2cos 2w +0.5cos w

Determine the coefficients of the impulse response h n of the FIR Filter.

7M

8. a) Design and realize a digital LPF using BLT to meet the following specifications: i. Monotonic passband and stopband ii. -3dB cutoff at 0.5 iii. -15dB attenuation at 0.75 rad/ sec

8M

b) For the analog transfer function:

)2)(1(2)(

sssH

Determine H(z) using invariance method. Assume T=1 sec.

7M

Unit – V

9. a) List and explain the advantages of multirate signal processing. 6M b) The input signal x n is down sampled by factor-M. Obtain the relationship between

the Fourier transform of the output and the input. Also comment on the aliasing effect of Down sampling.

9M

10. a) Explain the multistage implementation of Decimator by a factor D and interpolator by a factor I.

5M

b) Given 1x n = 2,6,3,0,1,2,3,4,5,7,4,2,1,3,4,6 and 2x n = 2,1,3,4,2,1,3,5,6,7,4,3,2,8,9, i. The signal 1x n and 2x n are applied to a decimator with decimation factor 3

and 4 respectively. Determine the decimated sequence ii. The signal 1x n and 2x n are applied to a interpolator with interpolation factor

2 and 3 respectively. Determine the interpolated sequence

10M





MICROWAVE ENGINEERING


Date: 02 May, 2016 Time: 3 hours Max Marks: 75 Answer ONE question from each Unit


Unit – I

1. a) List the Applications of microwaves. 7M b) From the field equations in rectangular wave guides for TEmn mode, obtain the

expressions for: i. Cut-off frequency fc ii. Phase velocity vg iii. Characteristic Impedance Zg iv. Wave length λg v. Propagation constant βg

8M

2. a) Briefly explain different losses in a microstrip line. 7M b) An air filled copper rectangular cavity of dimension 3cmX1cmX4cm operates at

TE101 mode. Given the conductivity of copper as 5.8 X 107mho/m, find the resonant frequency and Quality factor.

8M

Unit – II

3. a) Briefly explain the function of the following passive devices and give its S-matrix: i. Attenuator ii. 3 port- Circulator iii. Matched termination iv. Magic Tee v. Directional coupler

10M

b) A 5 dB waveguide attenuator is specified as having VSWR of 1.4. Assuming that it is reciprocal, calculate the scattering parameters and write its S-matrix.

5M

4. a) Explain the working of Faraday rotation Isolator with neat diagrams. 7M b) Give the Comparison between E-plane Tee and H-plane Tee.

8M

Unit – III

5. a) What is velocity modulation? Explain how amplification takes place in a two cavity Klystron amplifier.

7M

b) A Two – Cavity Klystron operates at 10GHz with Io=3.6mA, Vo=10KV.The drift space length is 2cm, the output cavity total shunt conductance Gsh=20μmho and beam coupling coefficient β =0.92. Find the maximum voltage gain.

8M

6. a) Explain the physical construction of high gain (>40dB), low noise, wideband microwave amplifier. Also discuss the process of bunch formation due to beam and field interaction in an amplifier.

9M

Cont…2

:: 2 ::

b) A dc beam voltage of 280 volts is applied to the anode of a Reflex Klystron whose cavity is tuned to a frequency of 9.75GHz. The length of repeller space is 1.2x10-

3m and is operated under 2 ଷସ mode of operation. If the resulting beam current is

15mA, determine the optimum value of RF power and the corresponding repeller voltage to be applied.

6M

Unit – IV

7. a) Give the constructional details and the electrical equivalent circuit of a Gunn diode. Explain two principal modes of operation.

9M

b) A pulsed cylindrical Magnetron is operated with the following parameters: Anode voltage=25KV Beam current =25A Magnetic flux density =0.34Wb/m2 Radius of cathode cylinder =5cm Radius of anode cylinder =10cm Calculate: i. The angular frequency ii. The cut-off voltage iii. The cut-off magnetic flux density

6M

8. a) Derive Hull Cut-off magnetic and Hull Cut-off voltage equations for a cylindrical magnetron oscillator.

7M

b) An IMPATT diode with nominal frequency 10GHz, has Cj =0.5pF, Lp =0.5nH, Cp =0.3pF at breakdown bias of 80V and bias current 80mA. The RF peak current is 0.65A for Rd =-2Ω. Find: i. Resonant frequency of oscillation ii. Efficiency

8M

Unit – V

9. a) Explain Bolometer sensor for power measurements. 5M b) In a slotted-line method of measurement of impedance, the voltage Vmax was

measured as 2V, Vmin as 1.6V and the distance between them as 1.25cm, when the device was connected at the output of the slotted line. When the device is replaced by a sliding short, the value of dVmin was measured as 0.48cm. Determine the magnitude and phase of the impedance of the device if the characteristic impedance of the line is 450Ω.

10M

10. a) Explain the insertion loss and attenuation measurements with a neat block diagram.

7M

b) In the double-minima method used for the measurement of high VSWR of a microwave device, the distance between successive 3dB points around a voltage minimum was measured as 1.1mm. The slotted waveguide line used in this measurement has a breadth of 2.5cm and width 1.25cm. Determine the VSWR and reflection coefficient of the microwave device if the frequency of the microwave signal is 10GHz in the dominant TE10 mode.

8M



(AUTONOMOUS) B. Tech VI Semester Supplementary Examinations, April/May - 2016

(Regulations: VCE-R11)

HUMAN RESOURCE MANAGEMENT




Unit – I

1. a) Define Human Resource Management. Explain its nature and Scope. 8M b) Why is managing human resources so important in an Industry?

7M

2. a) Explicate both Managerial and Operative Functions of Human Resource Management. 10M b) ‘Human Resource Planning is a highly important and useful activity.’ Elaborate.

5M

Unit – II

3. a) Write notes on recruitment policy and what are the considerations to formulate recruitment policy.

8M

b) List out the disadvantages of internal recruiting.

7M

4. a) What are the major challenges of recruitment? 8M b) Discuss about reasons why employees leave of an organization and briefly about their

retention strategies.

7M

Unit – III

5. a) Bring out the significance of Training Need Assessment in an organization. 10M b) Define Performance Appraisal and explain its objectives.

5M

6. a) Explain the each method of Performance Appraisal in brief. 8M b) Discuss both On the Job and Off the Job Training Methods.

7M

Unit – IV

7. a) Explain wage /salary management process. 8M b) Explain the need for extending benefits to employees.

7M

8. a) List the different types of fringe benefits. 5M b) What is need based minimum wage? Explain its need.

10M

Unit – V

9. a) Explain the meaning of Industrial relations and its components. 8M b) Explain Trade unions. Elaborate on why workers join trade unions?

7M

10. a) Explain the functions of Trade unions. 8M b) Explain the need for a grievance procedure. 7M



(AUTONOMOUS) B. Tech VI Semester Regular/Supplementary Examinations, April – 2016

(Regulations: VCE-R11/R11A) INDUSTRIAL MANAGEMENT AND PSYCHOLOGY

(Common to Electrical and Electronics Engineering, Mechanical Engineering & Civil Engineering)



Unit – I

1. a) What are the basic management functions for attainment of the desired goals of the organization?

8M

b) Elucidate Maslow’s Hierarchy of human needs.

7M

2. a) What do you comprehend by organization? Mention its main components. 7M b) With a neat schematic representation explicate on organization structure of a

manufacturing concern.

8M

Unit – II

3. a) What is the main purpose of plant layout in the industries? Also state the principles of plant layout.

8M

b) Deliberate the importance of plant layout. During different development stages of layout what type of methods can be implemented for development of plant layouts in industries?

7M

4. a) Define method study. How different is the basic procedure of solving problems than basic procedure of method study of solving problems?

8M

b) Define rating and standard performance. List the factors affecting the rate of working.

7M

Unit – III

5. The time and cost estimates and precedence relationship of the different activities constituting a project are given below:

Activity Predecessor activity Time(in weeks) Cost (in rupees) Normal Crash Normal Crash

A None 3 2 8000 9000 B None 8 6 600 1000 C B 6 4 10000 12000 D B 5 2 4000 10000 E A 13 10 3000 9000 F A 4 4 5000 5000 G F 2 1 1200 1400 H C,E,G 6 4 3500 4500 I F 2 1 700 800

i. Draw a project network diagram and find the critical path ii. If a dead line of 17 weeks is imposed for the completion of the project, what activities

will be crashed? What would be the additional cost and the critical activities after crashing the project

15M

Cont…2

:: 2 ::

6. a) What all should be considered for inspection of incoming materials or received materials?

5M

b) For a certain characteristics of a product of sample size 2, after 25 subgroups, =0.81, =27.635R X and specification limits are 1.12 0.087:

i. Is the process harmonized to the specifications ii. What is the percentage of rejections iii. Is the process capable of meeting the specifications iv. Harmonize the process to the specifications limits and obtain the control limits for

X R chart after harmonizing the process to the specifications

10M

Unit – IV

7. a) Deliberate on the various parameters that need to be well-thought-out while making purchase decision by the purchase department.

8M

b) What is inventory? Incline the roles of inventories.

7M

8. a) Describe different variables offered to the market at a particular point in time. 8M b) Give the procedural steps of ABC analysis and what each element of ABC analysis

furnishes?

7M

Unit – V

9. a) Define industrial psychology and identify its scope. How is it diverse from personal management?

8M

b) What are the categorized working conditions for human work behavior which influences the working environments?

7M

10. a) Illuminate industrial fatigue and how it affects the human in the working environment in the organization.

7M

b) Mention the causes of fatigue of employee and how to eliminate the fatigue of an employee in the organization.

8M




(Regulations: VCE-R11/R11A) COMPUTER METHODS IN POWER SYSTEMS

(Electrical and Electronics Engineering) Date: 27 April, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) Formulate ybus by inspection method for the data given below:

Bus Code R(pu) X(pu) 1-2 0.05 0.15 1-3 0.1 0.3 2-3 0.15 0.45 2-4 0.1 0.3 3-4 0.05 0.15

5M

b) Obtain the per unit reactance diagram of the power system shown in Fig.1. Choose a common MVA base of 30MVA and a voltage base of 3 KV on transmission line. Generator No. 1: 30MVA, 10.5kV, X” = 10% Generator No. 2: 15MVA, 6.6kV, X” = 12% Generator No. 3: 25MVA, 6.6kV, X” = 15% Transformer T1 (3phase) : 15MVA, 33/1 kV, X = 15.2% Transformer T2 (3phase) : 15MVA, 33/6.2kV, X = 16% Transmission line : 20.5Ohm/phase Load A : 15MW, 11kV, 0.9 p.f. lagging Load B : 40MW, 6.6kV, 0.85 lagging p.f.

Fig.1

10M

2. a) Explain the algorithm for modification of ZBUS to add a branch. 6M b) Construct the bus impedance matrix for the network shown in Fig.2:

Fig.2

9M

Cont…2

:: 2 ::

Unit - II 3. a) Explain the different types of buses. Also explain the significance of Slack bus. 6M b) Fig.3 shows a three bus power system. Using G-S method, determine the bus voltages at

the end of first iteration. The values shown are line impedances in pu. Bus data are given in table. Q limits are 20 1.5 . .Q p u

Bus Generation Load Voltage Bus type PG(PU) QG(PU) PD(PU) QD(PU) 1 -- -- -- -- 1.0500 Slack bus 2 3 -- -- -- 1.0 PV bus 3 -- -- 4 2 -- PQ bus

Fig.3

9M

4. a) List all the data required to carry out the load flow studies. 6M b) Explain the algorithm for Gauss Seidel method of load flow study.

9M

Unit – III

5. a) Compare various types of load flow methods. 6M b) Consider the three bus system of Fig.4. Each of the there lines has a series impedance of

0.02+j0.08 p.u. and a total shunt admittance of j0.02 p.u. The specified quantities at the buses are tabulated in table 5a. The controllable reactive power source is available at bus 3 with the constraint 0≤QG3≤1.5 p.u. Find the load flow solution using the NR method. The tolerance of 0.01 for power mismatch:

Fig.4

Bus Real load

demand

Reactive load

demand

Reactive load

Generation

Reactive power Generation

unspecified

Voltage specification

1 2.0 1.0 unspecified unspecified 1.04+j0 2 0.0 0.0 0.5 1.0 PQ Bus 3 1.5 0.6 0.0 Qg3=? |V3|=1.04(PV Bus)

9M

Cont…3

:: 3 ::

6. a) Explain the short circuit of a synchronous machine(on no load). 6M b) 25 MVA,11 KV generator with Xd”=20% is connected through a transformer, line and a

transformer to a bus that supplies three identical motors as shown in Fig.5. Each motor has xd”=25% and xd’=30% on the base of 5 MVA, 6.6 KV. The three phase rating of the step-up transformer is 25 MVA, 11/66 KV with a leakage reactance of 10% and that of the step-down transformer is 25 MVA, 66/6.6 KV with a leakage reactance of 10%. Three phase fault occurs at a point F. For the specified fault, calculate i. The subtransient current in the fault ii. The subtransient current in the breaker B iii. The momentary current in breaker B and d) the current to be interrupted by breaker B in five cycles

Fig.5

9M

Unit – IV

7. a) Define symmetrical components of a set of three phase unbalanced voltages. Obtain the matrix equation for a set of 3 phase unbalanced voltaged in terms of symmetrical components.

7M

b) Draw the zero sequence network for the system described in Fig.6. Assume zero sequence reactances for the generators and motors of 0.06 p.u. Current limiting reactors of 2.5 each are connected in the neutral of the generator and motor no.2.The zero reactance of the transmission line is 300

Fig.6

8M

8. a) Explain the power angle curve for a single machine connected to infinite bus. 7M b) A 50 Hz, four pole turbo generator rated 100 MVA, 11KV has an inertia constant of 8.0

MJ/MVA. i. Find the stored energy in the rotor at synchronous speed ii. If the mechanical input is suddenly raised to 80MW for an electrical load of 50MW, find rotor acceleration, neglecting mechanical and electrical losses iii. If the acceleration calculated in part (ii) is maintained for 10 cycles, find the change in torque angle and rotor speed in revolutions per minute at the end of this period

8M

Unit – V

9. a) Explain the equal area criterion for one machine is swinging with respect to an infinite bus.

6M

b) Find the critical clearing angle for the system shown in Fig.7 for a three phase fault at the pint p. The generator is delivering 1.0 p.u. power under prefault conditions. Find the critical clearing angle for the system shown in Fig. 9b for a three phase fault at the point p. The generator is delivering 1.0 p.u. power under prefault conditions. Find the critical clearing angle for the system shown in Fig.8 for a three phase fault at the point p. The generator is delivering 1.0 p.u. power under prefault conditions fault conditions:

Fig.7

9M

Cont…4

:: 4 ::

10. a) Explain the point-by-point solution of swing equation of one machine connected to an

infinite bus bar. 7M

b) A 20MVA, 50Hz generator delivers 18MW over a double circuit line to an infinite bus. The generator has kinetic energy of 2.52MJ/MVA at rated speed. The generator transient reactance is X’d= 0.35p.u. Each transmission circuit has R=0 and reactance of 0.2p.u. on a 20MVA base |E’|=1.1p.u. and infinite bus voltage V = 1.000. A three phase short circuit occurs at the midpoint of one of the transmission lines. Plot swing curve with fault cleared by simultaneous opening of breakers at both ends of the line at 2.5 cycles after the occurrence of fault.

8M




(Regulations: VCE-R11/R11A) ELECTRICAL MEASUREMENTS

(Electrical and Electronics Engineering) Date: 29 April, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) With a neat sketch explain the construction and working of a permanent magnet moving coil instrument.

8M

b) A moving coil meter gives a full scale deflection of 10mA when the potential difference across its terminals is 100mV. Calculate: i. The shunt resistance for a full scale deflection corresponding to 100A ii. The series resistance for full scale reading with 1000V

7M

2. a) Explain with a neat sketch the construction and operation of a single phase power factor meter.

8M

b) A current transformer with 5 primary turns has a secondary burden consisting of a resistance of 0.16Ω and an inductive reactance of 0.12Ω, when the primary current is 200A. The magnetizing current is 1.5A and the iron loss current is 0.4A. Find the number of secondary turns needed to make the current ratio 100.1 and the phase angle.

7M

Unit – II

3. a) Describe with neat sketch the working of a single phase induction type energy meter. 7M b) Starting from the equation T= i1 i2 dM/dθ prove that the deflecting torque is proportional

to power in an electrodynamometer type wattmeter.

8M

4. a) Mention the need of Low power factor wattmeter. Explain the special features incorporated in an electrodynamometer wattmeter to make it a low power factor type of wattmeter

7M

b) With a neat sketch, explain the construction and working of a Ferrodynamic resonance type frequency meter.

8M

Unit – III

5. a) Explain with a neat sketch, the principle and operation of DC Crompton’s potentiometer. 7M b) Explain the various applications of AC potentiometers.

8M

6. a) Explain: i. How unknown voltage is measured using DC potentiometer ii. Standardization of potentiometer

8M

b) Explain how DC potentiometer is used for the measurement of: i. Unknown resistance ii. Calibration of ammeter

7M

Unit – IV

7. a) Derive the balance condition of Kelvin’s double bridge network and hence obtain the expression for the low resistance subjected for measurement.

7M

b) A 4 terminal resistor of approximately 50µΩ resistance was measured by means of a Kelvin bridge having the following component resistances: Standard resistor=100.03µΩ; Inner ratio arms=100.31Ω and 200Ω; outer ratio arms=100.24Ω and 200Ω; resistance of link connecting the standard and the unknown resistance=700µΩ. Calculate the unknown resistance.

8M

Cont…2

:: 2 ::

8. a) Explain loss of charge method of measuring high resistance. 7M b) A resistance of actual value 1Ω is measured by ammeter – voltmeter method. The current

carrying capacity of the resistance is 100mA and the measurement is done at this value of current. A 100mV of 5Ω resistance is used to measure the drop across the resistance. Find the measured value of the resistance and the error in measurement.

8M

Unit – V

9. a) Explain the operation of the Wein Bridge with a neat circuit diagram. Derive the expression for frequency.

7M

b) Explain the working of a dual slope type digital voltmeter with the help of block diagram.

8M

10. a) Obtain the balance equation for Owen’s Bridge with Phasor diagrams. 8M b) Explain the principle of successive approximation technique adopted in digital voltmeters. 7M





POWER ELECTRONICS

(Electrical and Electronics Engineering)



Unit - I 1. a) Compare a SCR, power BJT and IGBT with its working, switching operation, voltage and

current. 10M

b) A thyristor has a forward characteristic which may be approximated over its working range to be straight line shown in Fig.1. Calculate the power loss for Continuous ON state current of 2.1A:

Fig.1

5M

2. a) Discuss the need of dv/dt and di/dt protection for an SCR in power electronic circuits. 8M b) Discuss in brief the thyristor UJT firing circuit.

7M

Unit - II 3. a) Explain the operation of single phase converter as line commutated inverter with the aid

of circuit and neat waveforms. 7M

b) Derive an expression for average load voltage, average load current, RMS voltage, RMS current and load ripple factor of single phase half wave bridge rectifier with resistive load.

8M

4. a) Explain the effect of freewheeling diode in detail, also justify the statement “freewheeling diode improves the power factor”.

7M

b) Single phase full bridge converter has R load having, R=2.5ohm, and E=10V, input voltage=120V(RMS ) at 60HZ, determine: i. Load current at wt=0 and wt=60 degree ii. Load voltage at wt=0 and wt=60 degree

8M

Unit - III 5. a) With a neat circuit diagram explain the operation of three phase full wave controlled

rectifier with resistive load. Derive the expression for RMS load voltage in continuous mode.

9M

b) An ACVC has a resistive load of R=10 and RMS input voltage of 120V, 60Hz. The thyristors switch on for n=25 and off for m=75 cycles. Determine RMS value of output voltage, input power factor, average and RMS values of thyristor currents.

6M

Cont…2

::2::

6. a) Explain and compare two commonly used dual converter configurations. 7M b) A single phase half wave A.C voltage controller with feeds power to a resistive load of 6Ω

from 230V, 50Hz source. The firing angle is 900 Calculate: i. RMS value of the output voltage ii. The input power factor iii. The average input current

8M

Unit - IV 7. a) Explain the operation of single phase center tapped cycloconverter with resistive load.

Draw relevant waveforms. 8M

b) With help of neat waveforms, explain time ratio control for DC choppers.

7M

8. a) Explain the operation of step down chopper and derive an expression for output voltage and current.

8M

b) A step down dc chopper has a resistive load of R=15Ω and input voltage=200V, when chopper is ON, its voltage drop is 2.5V. The chopper frequency is 1kHz. If the duty cycle is 50%, determine: i. Average output voltage ii. RMS output voltage iii. Chopper efficiency

7M

Unit - V 9. a) With the help of neat diagram and wave form, explain the operation of single phase

series inverter. 8M

b) Explain the principle and operation of Mcmurray inverter.

7M

10. a) Explain the necessity to vary the output voltage of inverter also explain the external AC output voltage and PWM techniques.

8M

b) Design a series inverter for operation in the frequency range of 5KHZ, the load resistance may vary from 25ohms to 100ohms, the peak load current is limited to 3A and supply voltage is 100V.

7M





DATABASE MANAGEMENT SYSTEMS

(Electrical and Electronics Engineering)



Unit – I

1. a) Explain how Database approach is different from traditional approach of programming with files.

7M

b) An Organization wanted to maintain Research projects information. Provide an ER-Diagram for Research project database. Assume your own entities (minimum 5 entities), attributes and relationships. Mention the cardinality ratio and participation constraints.

8M

2. a) Explain Database Management System Architecture with a neat diagram. 8M b) Define Data independence. Explain the importance of Logical and Physical data

independence.

7M

Unit – II

3. a) Define a Join operation. What are the different types of JOIN operations in Relational algebra. Explain with an example.

8M

b) Explain the aggregate functions in relational algebra with an example.

7M

4. a) How the violation of referential integrity constraints are handled in SQL? Explain with an example.

6M

b) Explain the different clauses of SELECT command with an example.

9M

Unit – III

5. a) Discuss the need for normalization. Explain First, Second and Third Normal Forms with an example. .

10M

b) Consider the universal relation R=A,B,C,D,E,F,G,H,I,J and set of functional dependencies F= AB->C,A->DE,B->F,F->GH,D->IJ find key for R.

5M

6. a) Explain the Armstrong rules. 10M b) Define transitive dependency. Explain the 3NF with an example. 5M

Unit – IV

7. a) Define a transaction. What are the desirable properties of a transaction? 6M b) Discuss the different types of anomalies caused by interleaved execution of transaction

with an example.

9M

8. a) Consider a database with objects X and Y and assume that there are two transactions T1 and T2. Transaction T1 reads objects X and Y and then writes object X. Transaction T2 reads objects X and Y and then writes objects X and Y: i. Give an example schedule with actions of transactions T1 and T 2 on objects X and

Y that results in a write-read conflict ii. Give an example schedule with actions of transactions T1 and T 2 on objects X and

Y that results in a read-write conflict iii. Give an example schedule with actions of transactions T1 & T2 on objects X and Y iv. that results in a write-write conflict v. For each of the three schedules, show that Strict 2PL disallows the schedule

10M

Cont…2

:: 2 ::

b) Contrast the timestamps assigned to restart transactions when timestamps are used for

deadlock prevention versus when timestamps are used for concurrency control.

5M

Unit – V

9. a) Define RAID? Discuss Data Stripping and Redundancy with example. 8M b) Explain how clustered and un-clustered indexes effect the efficiency of searching.

7M

10. a) Explain B+ tree. Give the main characteristics of B+ tree. 8M b) Explain about ISAM briefly. Discuss the operations that are considered for appropriate

file organization. 7M




VLSI DESIGN (Elective for Electrical and Electronics Engineering)



Unit – I

1. a) Write short notes on: i. Channel Length Modulation ii. Body bias effect

6M

b) For a NMOS Transistor tox=500Ao, Substrate doping NA=1.10016/cm3, oxide interface fixed charge density Nox=2x1010/cm3. Calculate VT for an MOS transistor.

9M

2. a) With necessary diagrams, derive an expression for current through an NMOS transistor from basic principles, for both linear region and saturated region.

7M

b) For each of the bias conditions clearly identify the region of operation and hence calculate the drain current. kn’=100µA/V2, kp’=40µA/ V2, VTN=|VTP|=0.5V, VSB=0v, VDD=3v, Ignore channel length modulation and secondary effects: i. NMOS device with W=1.5µm, L=0.6µm, Vs=0v, VG=2V, VD=1v ii. Same NMOS device as above, VGS=1.5v, VDS=2.5v

8M

Unit – II

3. a) Write notes on: i. Isolation in a MOS transistor ii. use of polysilicon for gate material

6M

b) With neat diagrams describe in detail the steps necessary to fabricate a CMOS inverter in the N-Well CMOS process.

9M

4. a) Write notes on the following with necessary diagrams: i. Oxidation process ii. Diffusion

8M

b) With necessary diagrams explain a PMOS can be fabricated in a nwell process.

7M

Unit – III

5. a) Draw the circuit diagram and stick diagram for two inputs CMOS NAND gate. 8M b) Derive the equations for rise time of CMOS inverter with equivalent circuits.

7M

6. a) Briefly explain the dynamic power dissipation in CMOS inverter. 9M b) Explain and derive the expression for sheet resistance and standard unit capacitance.

6M

Unit – IV

7. a) Explain the CMOS Domino logic with relevant circuit diagram. 8M b) Draw the circuit to implement two input XOR gate using complementary pass transistor

logic.

7M

8. a) Draw the typical 2- input NAND and 2- input NOR gate symbolic layouts. 8M b) Draw the CMOS logic for the function Z=(D+E+A)(B+C). 7M

Cont…2

:: 2 ::

Unit – V

9. a) What is meant by adhoc testable design technique? Discuss any two of them in detail. 7M b) What do you mean by Controllability and Observability? Use one example to make your

point.

8M

10. a) With necessary diagram, explain scan-based design techniques. 6M b) Give a logic circuit example in which stuck at-1 fault and stuck at-0 fault are

indistinguishable. 9M




PRODUCTION PLANNING AND CONTROL (Mechanical Engineering)



Unit - I 1. a) Explain types of production system. 7M b) A lathe manufacturer had noted the sales invoices from January to August and noticed

the sales during each month as 10, 11, 10, 11, 14, 15, 14 and 15 units respectively. What would be his estimate of sales for September: i. If he has followed 4 month weighted moving average (with weights 0.4, 0.3, 0.2 and

0.1) ii. If he has followed SES with α=0.2 and his estimated sales for January is 11

8M

2. a) Explain functions of production planning and control department. 5M b) Find the seasonal fluctuation by the method of moving averages. Use the data given

below. Aslo find the forecast for the year 2017:

QUARTERS YEAR Qtr I Qtr II Qtr III Qtr IV 2012 2013 2014 2015 2016

30 34 40 54 80

40 52 58 76 92

36 50 54 68 86

34 44 48 62 82

10M

Unit - II 3. a) Explain the inpuits to MRP system. 6M b) i. Explain different types of inventories

ii. Explain graphically EOQ

9M

4. a) Explain VED analysis. 6M b) The store of an oil engine repair shop has 10 items whose details are shown in table.

Apply ABC analysis to the store:

Component code Price / unit (Rs) Annual demand units/ Year

C01 100 100 C02 200 30 C03 50 700 C04 300 400 C05 500 1000 C06 3000 30 C07 1000 100 C08 7000 500 C09 5000 105 C10 60 1000

9M

Cont…2

::2::

Unit - III 5. a) Explain various costs associated with aggregate planning strategies. 5M b) The following list defines the precedence relationships and element times for a new

model toy:

Element Te (Min) Immediate predecessors 1 0.5 - 2 0.3 1 3 0.8 1 4 0.2 2 5 0.1 2 6 0.6 3 7 0.4 4, 5 8 0.5 3, 5 9 0.3 7, 8

10 0.6 6, 9

i. Construct the precedence diagram for this job ii. If the ideal cycle time is to be one minute, determine the assignment of work

elements to stations using RPW method

10M

6. a) Briefly explain factors affecting Routing. 5M b) Demand forecast for a non automatic washing machine is given in the following table for

3-periods:

Period Q Demand forecast

Supply capacity (units) Regular time Overtime Subcontract

1 600 975 225 150 2 1050 975 225 150 3 1600 975 225 150

Initial inventory=0, ending inventory=200 Unit production cost (Regular)=Rs 5000/- Overtime production cost/unit=Rs 8000/- Subcontracting cost/unit=Rs 12000/- Inventory carrying cost=Rs 100/unit/ period Formulate the transportation matrix for the above problem and give a starting solution

10M

Unit - IV 7. a) Differentiate between Line balancing and Line of Balancing. 5M b) The time for processing five jobs on lathe and Drilling machine is given below:sequebce

the job and determine the total elapsed time and idle time for each machines Processing time(in hrs):

Job A B C D E Drilling machine 5 3 8 10 7

Lathe 2 6 4 7 12

10M

Cont…3

::3::

8. a) Today is day 25 on XYZ food production schedule. Three jobs are on order as indicated below. Compute the sequence of jobs by least slack method:

Job Due date Work days remaining A B C

30 28 27

4 5 2

5M

b) Two Jobs are to be processed through four machines A,B,C,D with the following technological ordering:

Job 1 A B C D Job 2 D B A c

Processing times are given in the following table: Machines

A B C D Job 1 20 40 50 10 Job 2 20 50 30 60

Find the minimum elapsed time and idle time for both the Jobs.

10M

Unit - V 9. a) List and explain various Forms used in Dispatching. 5M b) Explain Production Scheduling for Fluctuation demand.

10M

10. Write short notes on: i. Expediting procedure ii. Types of followups iii. Activities of dispatcher

15M



B. Tech VI Semester Regular Examinations, April - 2016 (Regulations: VCE-R11/R11A)

DESIGN OF MACHINE MEMBERS-II (Mechanical Engineering)



Unit - I 1. a) Define the terms:

i. Bearing characteristic number ii. Bearing modulus

5M

b) A bearing, 50mm in diameter and 75mm in length; supports a overhanging shaft, running at 900rpm. The room temperature is 30o C, and the bearing temperature is 75o C. The viscosity of the oil used is 0.012kg/m-s at the operating temperature of 120o C. The diametral clearance is 0.05mm, and the bearing is to operate in still air, without any artificial cooling. Determine: i. The permissible load on the bearing ii. Power loss

10M

2. a) What are the advantages and dis-advantages of rolling contact bearing? 5M b) A shaft, 150mm in diameter, rotates in a bearing at 2000rpm. The length of the bearing

is 1.4 times its diameter. The bearing pressure is 1N/mm2, and the coefficient of friction at the bearing surface is 0.005. Determine the power loss in friction. The temperature of the bearing is entirely controlled by the flow of oil through the bearing. If the difference between the outlet and inlet temperatures is 15o C, determine the quantity of coolant oil required, if the specific heat of the oil is 1900 J/kgoC.

10M

Unit - II 3. A four stroke diesel engine has the following specifications:

Brake Power = 5 kW Speed = 1200 rpm Indicated mean effective pressure = 0.35 N/mm2

Mechanical Efficiency = 80% Determine: i. Bore and length of the cylinder ii. Thickness of the cylinder head iii. Size of studs for the cylinder head

15M

4. Design a cast iron piston for a single acting four stroke engine for the following data: Cylinder bore = 100 mm Stroke = 125 mm Maximum gas pressure = 5 N/mm2

Indicated mean effective pressure = 0.75 N/mm2

Mechanical Efficiency = 80% Fuel consumption = 0.15 kg per brake power per hour Higher calorific value of fuel = 42 X 103 kJ/kg Speed = 2000 rpm. Any other data required for the design may be assumed.

15M

Cont…2

::2::

Unit - III 5. Two spur gears are to be used for a rock crusher drive and are to be of minimum size. The

gears are to be designed for the following requirements: power to be transmitted is 18kW, speed of pinion 1200rpm, velocity ratio 3.5 to 1, tooth profile 200 stub involute. Determine module and face width for strength requirements only. Take number of teeth on pinion=16, σ01=σ02=515MPa, Cs=1.5, b=10m.

15M

6. Design a pair of helical gears to transmit power of 15KW at 3200rpm with speed reduction 4:1 pinion is made of cast steel 0.4% C untreated (σ01=69.6MPa). Gear is made of high grade CI (σ02=31MPa). Helix angle is limited to 26o and not less than 20 teeth are to be used on either gear. Suggest suitable surface hardness for the gear pair. Assume pressure angle in the normal plane=20o full depth. Take b=10mn.

15M

Unit - IV 7. Design a pair of bevel gears to transmit 12kW at 300 rpm of the gear and 1470rpm of the

pinion. The angle between the shaft axes is 90o. The pinion has 20 teeth and the material for gears is cast steel (σo=183.33N/mm2, BHN=320) Take service factor as 1.25 and check the gears for wear and dynamic load. Suggest suitable surface hardness for the gear pair.

15M

8. The following data refer to a worm and worm gear drive: a. Centre distance 200mm b. Pitch circle diameter of the worm 80mm c. Number of start 4 d. Axial module 8mm e. Transmission ratio 20 f. The worm gear is made up phosphor bronze with an allowable bending stress of 55MPa g. The worm is made of hardened and ground steel h. Tooth form is 20o full depth involute Determine the following: i. Number of teeth on the worm gear ii. Lead angle iii. Face width of worm gear to transmit 15kW of power at 1750rpm of the worm based on

the beam strengths of the worm gear

15M

Unit - V 9. a) Explain the following with neat sketches:

i. ACME thread ii. Square Thread

6M

b) A load of 12kN is raised by a screw, with single start square threads of 50mm mean diameter and 12mm pitch. The screw is operated by a hand-wheel, the boss of which is threaded to act as a nut. The load is resisted by a thrust collar, which supports wheel boss, and has a mean radius of 30mm. The coefficient of friction is 0.15 for the screw, and 0.18 for the collar. If the tangential force applied by each hand on the wheel is 120N, determine the diameter of the hand-wheel required.

9M

10. a) Briefly discuss the main requirements of the slide ways. Also, explain in brief the main factors that predominate in machine tool beds.

9M

b) Write short note on design for strength and rigidity of machine tool elements. 6M





HEAT TRANSFER

(Mechanical Engineering)



Unit - I 1. a) Derive three dimensional heat conduction equation in Cartesian co-ordinates if the

material is homogeneous, that is properties like specific heat, density, thermal conductivity are same.

10M

b) A carbon steel plate 600mm X 900mm X 25mm of 45W/m°C thermal conductivity is maintained at 310°C. Air at 15°C blows over the hot plate. If convection heat transfer coefficient is 22 W/m2°C and 250W is lost from the plate surface by radiation. Calculate the inside plate temperature.

5M

2. a) Derive one dimensional general heat conduction equation in cylindrical co-ordinates. 10M b) Sheets of brass and steel each of thickness 1cm are placed in contact. The outer surface

of brass is kept at 100°C and the outer surface of steel is at 0°C. What is the temperature of the common interface? The thermal conductivity of brass and steel are in the ratio of 2:3.

5M

Unit - II 3. a) Obtain a temperature distribution equation for a steady state heat transfer through a

hollow sphere without heat generation. 9M

b) A hollow sphere of inside radius 4cm and outside radius 6cm is electrically heated at the inner surface at a constant rate of 105W/m2. At the outer surface it dissipated heat by convection into a fluid at a temperature of 100°C and a heat transfer coefficient of 450W/m2K. The thermal conductivity of the solid is 20W/mK. Calculate the inner and outer surface temperature.

6M

4. a) Derive the expressions for the instantaneous heat flow and total heat flow for a lumped capacity system.

8M

b) A solid copper sphere 10cm diameter initially at a uniform temperature of 250°C is suddenly immersed in a well stirred fluid which is maintained at 50°C. The heat transfer coefficient between the sphere and the fluid is 200W/m2K. Determine the temperature of the copper block 5 minutes after immersion.

7M

Unit - III 5. a) With reference to fluid flow over a flat plate discuss the concept of velocity boundary

layer and thermal boundary layer, with necessary sketches. 5M

b) A horizontal plate 1mX0.8m is kept in a water tank with the top surface at 60oC providing heat to warm stagnant water at 20oC. Determine the value of h. Repeat the problem for heating on bottom surface.

10M

Cont…2

::2::

6. a) Using dimensional analysis show that Nusselt number is the function of Prandtl and

Grashoff number that is Nu=C(Pra, Grb). 9M

b) Air at 20oC and 1 bar pressure flows over a flat plate at 35m/s. The plate is 75cm long and is maintained at 60oC. Assuming unit depth in the z-direction calculate the 'h' from the plate

6M

Unit - IV 7. a) With a neat diagram explain the regimes of pool boiling. 8M b) A vertical cooling fin approximates a flat plate of 40cm height and is exposed to

saturated steam at 100oC (hfg=2257kJ/kg). The fin is maintained at a temperature of 90oC. Calculate: i. Thickness of the film at the bottom of fin ii. Average heat transfer coefficient iii. Heat transfer rate after incorporating McAdam's correction Take density as 965 kg/m3, k=0.68W/m-k and dynamic viscosity-3.53X10-6 Pa-s

7M

8. a) With proper assumption derive an expression for LMTD of a parallel flow heat exchanger.

8M

b) A heat exchanger has an effectiveness of 0.5, when the flow is counter and thermal capacity of one fluid is twice that of the other fluid calculate the effectiveness of the heat exchanger if the direction of flow of one of the fluids is reversed with the same mass flow rate as before.

7M

Unit - V 9. a) Clearly defined:

i. Blackbody ii. Plank's law iii. View factor iv. Radiation shield

8M

b) Assuming that the sun is a black body emitting radiation with maximum intensity at λ=0.49 µm, calculate the following: i. The surface temperature of the sun ii. The heat flux at the surface of the sun

7M

10. a) Define the following terms: i. Total emissive power ii. Monochromatic emissive power iii. Emissivity iv. Intensity of radiation v. Solid angle

10M

b) Liquid oxygen whose boiling temperature is -182°C is to be stored in spherical container of 30cm diameter. The system is insulated by an evacuated space between inner space and surrounding 45cm inner diameter concentric sphere. For both spheres ε=0.03 and temperature of the outer sphere is 30°C. Estimate the rate of heat flow by radiation to the oxygen in the container.

5M





FINITE ELEMENT METHODS

(Mechanical Engineering)



Unit – I

1. a) Distinguish between FEM vs Classical methods. 7M b) Derive the equations of equilibrium for 2D problems including body forces.

8M

2. a) State and explain minimum potential energy. 5M b) For the spring system shown in Fig.1 using the principle of minimum potential Energy,

determine the nodal displacements. Take F1 = 75 N and F2 = 100 N:

Fig.1

10M

Unit – II

3. For the two-bar truss shown in Fig.2, determine the reaction forces, nodal displacements, and element stresses. E=200Gpa.

Fig.2

15M

4. A beam is fixed at one end and supported by a rollers as shown in Fig.3. Calculate the reactions and deflection at mid-point of first span with UDL of 12 kN/m. E=200Gpa and I=4x106mm4.

Fig.3

15M

Cont…2

:: 2 ::

Unit – III

5. In the element shown in Fig. 4 ‘P’ is the point (6, 5). On this point the load components in x and y directions are 8kN and 12kN respectively. Determine the nodal equivalent forces.

Fig.4

15M

6.

a) Evaluate the integral 1 2

1cos

2xx dx

using three point Gaussian quadrature (use

appropriate values).

7M

b) Derive the expression for consistent load vector due to self weight in a CST element.

8M

Unit – IV

7. a) Derive shape functions for 2 noded one dimensional heat transfer element in global coordinates.

6M

b) Determine the temperature distribution in the rectangular fin shown in Fig.5 Heat generated inside the fin is 500W/m3.Neglect convection heat transfer.

Fig.5

9M

8. Write equations for the following in torsion analysis of noncircular cross section using torsional triangular elements. Explain different terms used. i. Prandtl governing equation ii. B matrix iii. Stiffness matrix iv. Load vector v. Evaluation of shear stress components vi. Twisting torque

15M

Unit – V

9. Determine the eigen values and eigenvectors for the stepped bar shown in Fig.6 E = 200Gpa, = 7830kg/m3.

Fig.6

15M

10. Using one finite beam element, determine the first two natural circular frequencies of a cantilever beam. Assume constant values of E,, I and A. Use consistent mass matrix.

15M




FATIGUE AND FRACTURE MECHANICS (Mechanical Engineering)



Unit - I 1. a) Describe the correction factors to be applied to endurance limit. 8M b) What is stress concentration? How is it evaluated? Mention the methods of improving

fatigue strength of shafts with holes, grooves, splines and keyways?

7M

2. a) Illustrate the modified Goodman diagram and elaborate on its significance in design of machine components.

6M

b) A steel rod of ultimate strength 600MPa and yield strength 400MPa is subjected to a cyclic torque ranging from 350Nm to -100Nm. Calculate the diameter of the rod using a factor of safety of 1.8. Given, Torsional yield stress=70% Y, Average endurance limit=50% u, and shear stress concentration factor=1.3.

9M

Unit - II 3. a) Differentiate High cycle and low cycle fatigue. Give examples. 8M b) Write Coffin-Manson relation for low cycle fatigue. Explain the significance of each of the

terms involved.

7M

4. a) What is cumulative fatigue damage? Explain the Miner’s rule for prediction of fatigue life of a component.

8M

b) Enumerate the various cycle counting methods and explain any one for variable amplitude loading.

7M

Unit - III 5. a) Derive expression for energy release rate in terms of potential energy for an advancing

crack. 7M

b) What are the common features of a typical fatigue fracture surface? Illustrate with a sketch and explain.

8M

6. a) Describe the Griffith’s theory as applied to crack propagation. Show that stress required to advance a given crack for plane stress case is given by:

10M

b) Discuss the effect of stress corrosion on crack propagation.

5M

Unit - IV 7. a) Differentiate Stress concentration factor and Stress Intensity Factor. 6M b) A steel plate (YS=350MPa) of width 80mm and thickness 5mm has a centre crack of

40mm length. If the far field stress is 150MPa, determine the stress intensity factor. What would be variation in value of SIF if the crack were to be an edge crack of length 40mm.

9M

Cont…2

::2::

8. a) Discuss the effect of thickness on fracture toughness of a specimen. How does thickness

affect plastic zone? 9M

b) What kind of finite elements are used to analyse stress-field around a crack-tip? How are these elements different from the regular elements?

6M

Unit - V 9. a) Explain Safe-life and Fail-Safe design and Importance of fracture mechanics in Aerospace

structure. 7M

b) Define energy release rate and obtain the mathematical formulation for the energy release rate (G) using change in compliance approach.

8M

10. a) Explain the different conditions that can cause the failure of a structural component. 8M b) Explain experimental determination of Inter laminar toughness of a composite laminate. 7M




AIR POLLUTION AND CONTROL METHODS (Elective for Mechanical Engineering)



Unit – I

1. a) What are the harmful effects of the following on humans: i. Sulphur dioxide ii. Carbon monoxide iii. Hydrocarbons iv. Insecticides

8M

b) What is acid rain? What are the causes for acid rain? What are the effects of acid rain?

7M 2. a) What is meant by smog? Discuss its causes and effects. 8M b) Explain the following with respect to leaf damage due to air pollution:

i. Necrosis ii. Chlorosis iii. Abscission iv. Epinasty

7M

Unit – II

3. a) Write notes on carbon monoxide control. 7M b) Explain control of gaseous contaminants by Adsorption process.

8M 4. a) Explain primary meteorological parameters influencing air pollution. 8M b) Write explanatory note on:

i. Dispersion models ii. Estimation of plume rise

7M

Unit – III

5. Describe with neat sketches, how different atmospheric conditions give rise to different kinds of plumes.

15M

6. a) Explain the following: i. Temperature inversions ii. Wind rose

8M

b) Explain with examples how topographical features influence air movement.

7M

Unit – IV

7. Explain with a neat sketch construction, working, advantages, disadvantages and applications of a settling chamber.

15M

8. Explain with a neat sketch principles, construction and operating problems of fabric filter.

15M

Unit – V

9. a) Define Emission standard and explain emission standards for Mobile source and stationary source.

8M

b) Explain briefly the source correction methods used in various industrial operations to control air pollution.

7M

10. a) Discuss any two methods for monitoring nitrogen oxides and state their limitations. 8M b) Discuss briefly the various factors to be considered for environment management. 7M




(Regulations: VCE-R11/R11A) CONTROL SYSTEMS

(Aeronautical Engineering) Date: 22 April, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) Develop block diagram for armature controlled D.C. servomotor and find its transfer function.

7M

b) Obtain differential equations describing the mechanical system shown in Fig.1. Draw electric circuit based on F-V analogy.

Fig.1

8M

2. a) Derive the transfer function of A.C. Servomotor stating the assumptions made. 7M b) Write the differential equations for the mechanical rotational system shown in Fig.2.

Obtain the torque-current analogy of the system.

Fig.2

8M

Unit – II

3. a) Determine the transfer function for the block diagram shown in Fig.3 by block diagram reduction technique.

Fig.3

8M

b) Draw the signal flow graph for the block diagram shown in Fig.4, determine the transfer function using Mason’s gain formula.

Fig.4

7M

Cont…2

:: 2 ::

4. a) Determine the transfer function of the block diagram shown in Fig.5 by block diagram reduction method.

Fig.5

7M

b) Using Mason’s gain formula determine the TF for the signal flow graph shown in Fig.6.

Fig.6

8M

Unit – III

5. a) Given the poles of a second order system as -3 ± j7, find the damping ratio, natural frequency, peak time, percentage overshoot and settling time.

7M

b) Consider a unity feedback system with forward transfer function 120 2

3 4

sG s

s s

.

Find the steady state errors for inputs 5u t , 5 ru t and 24t u t where u(t) is unit step and ur(t) is unit ramp.

8M

6. a) Check the stability of the given characteristic equation using Rouths method. 6 5 4 3 22 8 12 20 16 16 0.s s s s s s

7M

b) Consider a unity feedback system with forward transfer function

2 4 20

2 4

K s s

s s

. Sketch

the root locus showing salient points and comment on the stability.

8M

Unit – IV

7. a) Draw the bode diagram for the unity feedback system with open loop transfer function

20

1 7 50s

s s s

.

8M

b) Sketch the Nyquist diagram for the open loop transfer function 20 3

1 4s

s s s

and

comment on stability.

7M

8. a) Explain in brief frequency domain specifications. 5M b) Draw the bode plots for a unity feedback system with open loop transfer function

5 20 50s s sKGs

. Find the range of gain K within which the system is stable.

Find the gain margin and phase margin for K = 10,000.

10M

Cont…3

:: 3 ::

Unit – V

9. a) What are the advantages of state variable approach for the analysis of control systems? 5M b) List the properties of state transition matrix. Find the state transition matrix for

xx

200120012

10M

10. a) Obtain a state space representation of the mechanical system shown in Fig.7, where u(t) is the input to the system and displacement y(t) is the output.

Fig.7

7M

b) Consider the system described by 1 1

22

4 1 13 1 1

x xu

xx

, 1

2

1 0x

yx

.

Obtain the transfer function of the system.

8M





AEROSPACE PROPULSION-II

(Aeronautical Engineering)



Unit – I

1. a) With help of need diagrams explain functioning of film cooling and transpiration cooling?

8M

b) With a neat sketch explain the working principle of turbo jet engine.

7M

2. a) Explain the limiting factors in gas turbine engines. 5M b) What are the methods of blade cooling?

10M

Unit – II

3. a) With a neat sketch, explain the working principle of turbo fan engine. 8M b) With a neat sketch, describe the working principle of solid propellant rocket engine.

7M

4. a) What is the working principle of scram jet? Explain it with a sketch. 10M b) Explain thrust augmentation technique.

5M

Unit – III

5. a) What are the different propellant grain design considerations? 5M b) What are different solid propellant ingredients?

10M

6. a) Explain the working principle and combustion process in liquid propellant rocket system. 10M b) What are advantages and disadvantages of solid propellant rockets?

5M

Unit – IV

7. A rocket projectile has the following characteristics. Initial mass=200Kg Mass after rocket operation=130Kg Payload, non-productive structure =110Kg Rocket operating duration=3sec Average specific impulse of the rocket =240sec Determine: i. Mass Ratio ii. Propellant mass fraction iii. Propellant flow rate iv. Thrust v. Thrust to weight ratio

15M

8. A rocket operates at sea level (p=0.1013MPa) with a chamber pressure of p1=2.068MPa or 300psia, a chamber temperature of T1=222K, and a propellant consumption o of m=1 kg/sec. (Let k=1.30, R= 345.7 J/kg-K). Show graphically the variation of A, v, V, and M, with respect to pressure along the nozzle. Calculate the ideal thrust and the ideal specific impulse.

15M

Cont…2

:: 2 ::

Unit – V

9. a) Classify different types of nuclear rocket engines. 6M b) Explain the preliminary concepts of nozzle less rockets.

9M

10. a) Write a note on turbo pump feed system of liquid propellant rocket propulsion. Draw a neat sketch.

7M

b) Explain ion propulsion rocket engine with approximate power distribution concept. 8M



(AUTONOMOUS) B. Tech VI Semester Regular Examinations, April - 2016


FLIGHT VEHICLE DESIGN




Unit - I 1. a) Describe design and explain different types of aircraft design by using neat diagrams. 8M b) Write a note on design of wheel in aircraft design and write the design considerations of

aircraft wheels.

7M

2. a) What is the airfoil and explain the airfoil geometry by using neat diagram. 5M b) What is Initial takeoff weight build-up? How is empty weight estimation done?

10M

Unit - II 3. Explain tail geometry and arrangement considerations in aircraft conceptual design process.

15M

4. a) Describe the selection of thrust-to-weight ratio and wing loading. 8M b) What do you understand from the term of sizing and explain control surface sizing in the

conceptual design process.

7M

Unit - III 5. a) What are various landing gear arrangements considered in the aircraft design process. 8M b) What is the shock, explain various types of shock absorbers used in aircraft design

process.

7M

6. What are the different loads are acting on aircraft and explain gust loads with the help of suitable diagrams.

15M

Unit - IV 7. Explain the effect of wind on aircraft performance and write aircraft performance

characteristics.

15M

8. Write a note on aircraft parts and their working by using detail drawings, and write about airline economics.

15M

Unit - V 9. Draw the Boeing-747 aircraft:

i. Front view ii. Side view iii. Top view

15M

10. Draw the detail diagram of Airbus-380: i. Front view ii. Side view iii. Top view

15M




FINITE ELEMENT MODELING AND ANALYSIS (Aeronautical Engineering)



Unit – I

1. a) A simply supported beam subjected to a point load at center. Determine the maximum deflection using variational method.

10M

b) Derive a relationship between Natural Co-ordinate and Global Co-ordinate systems.

5M

2. a) Explain node numbering scheme for Finite Element Mesh. 5M b) Using the Principal of Minimum Potential Energy, determine the displacements of nodes

of spring system shown in Fig.1.

10M

Fig.1

Unit – II

3. a) Derive shape function for 1-D bar elements in natural co-ordinate system. 5M b) Considering the stepped bar shown in Fig.2, determine the Nodal displacement by using

elimination approach.

Fig.2

10M

4. a) Derive quadratic shape function for a bar element using Lagrange’s methods. 5M b) Derive shape function for a 9-noded quadrilateral element using Lagrange’s methods.

10M

Unit – III

5. a) Derive strain matrix and Jacobian matrix for CST element. 10M b) What are ISO-parametric, Sub-parametric and Super-parametric elements?

5M

6. Derive the element stiffness matrix for the two noded beam element. 15M

Cont…2

:: 2 ::

Unit – IV

7. a) For the following matrices given solve by Gauss elimination method:

1 2 3 45 3 2 4,x x x x 1 2 3 44 3 3 2 5,x x x x 1 2 3 41 2 2 3 6x x x x and

1 2 3 44 3 5 2 7.x x x x

12M

b) Evaluate 1 2

1

132

xI e x dxx

using two point Gauss quadrature method.

3M

8. a) Solve the following system by Gauss elimination Method: 9,x y z 2 3 8x y z and 2 3.x y z

8M

b) Integrate 1 3 2 3 2

12 2 1I x x y y dydx

using 2-point and 3-point Method.

7M

Unit – V

9. a) What are axisymmetric solids? Write down their stress strain relation. 5M b) Briefly explain the following stages of FEA:

i. Pre-processor ii. Processor iii. Post-processor

10M

10. a) Bring out the difference between Continuum Method and Finite Element Method. 5M b) Using neat sketches describe a library of 1D, 2D and 3D elements used in practice. 10M




OPERATIONS RESEARCH (Common to Aeronautical Engineering & Civil Engineering)



Unit – I

1. a) Define operations research. Briefly Explain the industrial applications of operations research.

5M

b) A company distributes TWO products and it can either buy them from another company or it can make them in its own plant. The cost of each alternative and the production rates are as follows:

Decision Product A Product B Buy Rs.10/- per unit Rs.17/- per unit Make Rs.12/- per unit Rs.15/- per unit Production rate 3 units per hour 5 units per hour

The company must have 100 units of A and 200 units of B at least per week. There are 40hrs of production time for the given week and idle time cost is Rs.25/hr. Furthermore, no more than 60 units of A and 120 units of B can be made each week. Formulate this as a Linear programming model.

10M

2. a) What are the limitations of graphical method of solving LPP? 3M b) Using Simplex method, solve the following LPP:

Maximize 1 25 4Z x x Subject to the following constraints,

1 2

1 2

1 2 1 2

3 2,4 9,2 2 1 and , 0

x xx xx x x x

12M

Unit – II

3. a) Explain the steps in the Hungarian method for solving assignment problems. 7M

b) Solve the travelling salesman problem given by the following data: C12 =20, C13 =4, C14 = 10, C23 = 5, C34 = 6 C25 = 10, C35 = 6, C45 = 20 where Cij = Cji. and there is no route between cities i and j if the value for Cij is not shown.

8M

Cont…2

:: 2 ::

4. a) List the various steps involved in solving transportation problem using Vogel’s approximation method.

3M

b) A company has four manufacturing plants and five warehouses. Each plant manufactures the same product which is sold at different prices in each warehouse area. The cost of manufacturing and cost of raw materials are different in each plant due to various factors. The capacities of the plants are also different. The data are given in the following table:

Plants Item 1 2 3 4 Manufacturing cost (Rs.) per unit 12 10 8 8 Raw material cost (Rs.) per unit 8 7 7 5 Capacity per unit time 100 200 120 80

The company has five warehouses. The sale prices, transportation costs and demands are given in the following table:

Warehouse Transportation Cost (Rs.) per

Unit Sale Price

Demand per Unit (Rs.) 1 2 3 4

A 4 7 4 3 30 80 B 8 9 7 8 32 120 C 2 7 6 10 28 150 D 10 7 5 8 34 70 E 2 5 8 9 30 90

i. Formulate this problem as a transportation problem to maximize profit ii. Find the IBFS solution using VAM method iii. Test for optimality and find the optimal solution

12M

Unit – III

5. a) What is sequencing? Write the procedure to graphically schedule 2 jobs on ‘m’ machines.

7M

b) Determine the sequence that minimizes the total time for performing the following jobs in the order CAB. Find the idle time for each machine in hours:

Jobs M/c 1 2 3 4 5 6 7 8

A 4 6 7 4 5 3 6 2 B 8 10 7 8 11 8 9 13 C 5 6 2 3 4 9 15 11

8M

6. The rate of arrival of customers at a public telephone booth follows Poisson’s distribution, with an average time of 12minutes between successive customers. The duration of a phone call is assumed to follow exponential distribution, with a mean time of 4 minutes: i. What is the probability that a person arriving at the booth will not have to wait ii. What is the average length of the non-empty queues that form from time to time iii. What is the probability that an arrival will have to wait more than 10 minutes before the

phone is free

15M

Unit – IV

7. a) Explain different types of inventory models. 6M b) A Fleet owner finds from this past experience that the cost/year of running the truck

whose purchase price rises to Rs.60000/- are given below: Year 1 2 3 4 5 6 7 8

Maintenance 10000 12000 14000 18000 23000 28000 34000 40000 Depreciation 30000 45000 52500 56250 58000 58000 58000 58000

At what age the truck is to be replaced?

9M

Cont…3

:: 3 ::

8. a) The annual demand for an item is 3200 units. The unit cost is Rs.6 and inventory carrying

charge is 25% per annum. If the cost of one procurement is Rs. 150, determine: Economic order quantity Number of orders per year

4M

b) The following mortality rate have been observed from a certain type of light bulbs:

Week 1 2 3 4 5 % of bulbs failing by the end of week 10 25 50 80 100 Individual failure at the end of week 0.1 0.15 0.25 0.3 0.2

There are 1000 bulbs in use and it costs Rs.2/- to replace an individual bulb which has burnt out. If all the bulbs are replaced simultaneously, it would cost 50paise per bulb. It is proposed to replace all bulbs at fixed intervals whether or not they have burnt out and to continue replacing burnt out bulbs as they fail. At what intervals should all the bulbs be replaced?

11M

Unit – V

9. a) State the dominance rules used in Game Theory. 3M b) A vessel is to be loaded with stocks of 3 items. Each item ‘i’ has a weight of wi and a

return of ri. The maximum cargo weight the vessel can take is 5 tons and the details of the three items are as follows:

Item, i wi, in tons ri in thousands of Rs. 1 1 30 2 3 80 3 2 65

Determine the number of units of each item that will maximize the total return without exceeding the maximum cargo weight using dynamic programming.

12M

10. a) What is dynamic programming problem? List the major steps in solving dynamic programming problem.

6M

b) Solve the following game. Also find value of the game:

Player A

Player B I II III I - 4 6 3 II - 3 -3 4 III 2 -3 4

9M





COMPOSITE MATERIALS




Unit – I

1. a) Differentiate between Composite materials and other engineering materials. State the specific advantages of composite materials.

7M

b) List and discuss different types of reinforcing materials used in making of composites.

8M

2. a) List the various applications of composite materials. 8M b) Classify composite materials based on nature of reinforcement. Discuss continuous and

discontinuous reinforcement.

7M

Unit – II

3. a) What are dispersion strengthened composites? Explain. 7M b) What are whiskers? Explain the method of processing of SiC whiskers using rice hull as

starting material.

8M

4. a) With a neat flow diagram explain the production of carbon fibres by carbonization process using PAN precursor.

8M

b) How Glass fibres are produced by melt drawing technique? Explain with neat sketch.

7M

Unit – III

5. a) Discuss the four basic steps involved in composite manufacturing. 8M b) Giving the salient features, explain injection molding method used for the production of

polymer matrix composites.

7M

6. a) Explain how pre-pegs are manufactured which are starting materials for bag molding process?

6M

b) Explain the differences between spray-up and hand lay-up methods used for the production of PMC’s with respect to starting materials, process details and advantages.

9M

Unit – IV

7. a) What is the principle behind solid state processing of MMC’s? Name the different solid state methods used for the production of MMC’s. Explain any one solid state method of producing MMC’s.

8M

b) Discuss the salient features and advantages of carbon-carbon composites.

7M

8. a) With the help of neat sketch, explain how Al-SiCp metal matrix composites are produced using vortex method.

8M

b) With examples explain Insitu method of synthesizing metal matrix composites.

7M

Cont…2

:: 2 ::

Unit – V

9. a) Derive rule of mixture for calculating strength and stiffness of FRP’s under Iso-Strain Condition stating clearly the assumptions made.

8M

b) Calculate the longitudinal modulus and strength of a unidirectional composite containing 60% by volume of carbon fibres (E1f=294GPa, fu=5.6GPa) in a toughened epoxy matrix (Em=3.6GPa, mu=105MPa). Compare these values with the experimentally determined values of E1=162GPa, 1u=2.94GPa.

7M

10. a) Give the differences between macro and micro mechanical analysis. Also mention the advantages and limitations of micro mechanical analysis.

8M

b) Boron (=2.54gm/cc) fiber reinforced Aluminium (=2.68 gm/cc) composite is produced using 40Vol% of boron fibres having modulus of elasticity 500GPa and tensile strength of 2GPa and Aluminium with a modulus of 70GPa and Tensile strength of 80MPa. Calculate: i. Density ii. Modulus of elasticity

7M





DESIGN OF STEEL STRUCTURES

(Civil Engineering)



Unit – I

1. a) What are the factors that influence the ductility, elasticity, strength and toughness of steel?

8M

b) Explain the limit state of strength and limit state of serviceability.

7M

2. a) Compare the properties of cast iron, wrought iron and steel. Why is steel considered superior for structural applications compared to the other two materials?

8M

b) Explain briefly various types of loads to be considered in design of steel structures.

7M

Unit – II

3. a) What are the advantages and disadvantages of welded connections? 7M b) Two plates 14mm thick are joined by:

i. A double-V butt weld ii. A single-V butt weld. Determine the strength of the welded joint in tension in each

case. Effective length of the weld is 20cm. Yield strength of steel=250N/mm2,

Partial safety factor for strength=1.10.

8M

4. Determine the design tensile strength of the plate 120mmx8mm connected to a 12mm thick gusset plate with bolt holes as shown in Fig.1. The yield strength and ultimate strength of the steel used are 250MPa and 400MPa. The diameter of the bolts used is 16mm.

Fig.1

15M

Unit – III

5. Determine the design Bending strength of laterally unsupported beam ISMB300 section of span 5m supported laterally only at the ends and subjected to uniform bending moment over the entire length.

15M

6. a) With neat sketches explain different types of the following: i. Splices ii. Base connection

8M

b) Explain “web buckling” and “web crippling” in flexural member. 7M

Cont…2

:: 2 ::

Unit – IV

7. a) With neat sketches explain different types of roof trusses. 6M b) Determine the design loads on purlins of an industrial building near Vishakapatnam

given, Terrain category=2, max dimension=40m, width of building=15m, height at eaves level=8m, topography θ<3o, span of truss=15m. Pitch =1/5, AC sheeting of roof, spacing of purlins=1.3m, spacing of truss=4m.

9M

8. a) Enumerate the design procedure of purlins. 5M b) A power plant structure having maximum dimension more than 60m is proposed to be

built on down hill side near Dehradun. The height of hill is 400m with a slope of 1 in 3. If the location is 250m from the crest of the hill on down ward slope and its eaves board is at a height of 9m, design the wind pressure as per IS 875 code.

10M

Unit – V

9. a) State the advantages and disadvantages of plate girder with trusses. 7M b) Explain the design of stiffeners with appropriate equations.

8M

10. Design the mid span section of a plate girder of span 20m for a superimposed load of 40kN/m. Adopt critical stress method.

15M




(Regulations: VCE-R11/R11A) GEO TECHNICAL ENGINEERING-II

(Civil Engineering) Date: 27 April, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) Explain Standard Penetration test. Discuss the corrections applied to the observed N-values.

7M

b) A seismic refraction study of an area has given the following data:

Distance of geophone from Source (m) 15 30 60 90 120 Time to receive wave, sec 0.025 0.05 0.1 0.11 0.12

Plot the time travel data and determine the seismic velocity for the surface layer and underlying layer. Determine the thickness of the upper layer.

8M

2. a) List the objectives of soil exploration. 6M b) During a soil exploration programme, a soil sample of length 550mm was recovered

using a split spoon sampler. The penetration length of the sample was 610mm. Dimensions of the sampler is given below: Inside and outside diameter of the sample tube = 5 and 38mm respectively Inside and outside diameter of the driving shoe = 35 and 51mm respectively Determine inside clearance, outside clearance, area ratio and recovery ratio and make comment about the degree of disturbance of the soil sample.

9M

Unit – II

3. a) Explain different types of slope failures with sketches. 7M b) A 5m deep canal has side slopes of 1:1. The properties of soil are cu = 20kN/m2, Φu = 10°,

e = 0.8 and G =2.8. If Taylor’s stability number is 0.108, determine the factor of safety with respect to cohesion when the canal runs full. Also find the same in case of sudden drawdown, if Taylor’s stability number for this condition is 0.137.

8M

4. a) Explain the method of slices for stability analysis of slopes. 7M b) An embankment is to be constructed with c = 20kN/m2, = 20°, = 18kN/m3, FS =1.25

and height is 10m. Estimate side slope required. Taylor’s Stability Numbers are as follows for various slope angles:

Slope angle 90 75 60 45 30 20 10 Sn 0.182 0.134 0.097 0.062 0.025 0.005 0

Also find the factor of safety, if the slope is 1V: 2H given = 20°.

8M

Unit – III

5. a) Explain active earth pressure, passive earth pressure and earth pressure at rest with sketches.

7M

b) A vertical excavation was made in a clay deposit having weight of 20kN/m3. It caved in after the depth of digging reached 4m. Taking the angle of internal friction to be zero, calculate the value of cohesion. If the same clay is used as a backfill against a retaining wall upto a height of 8m, calculate: i. Total active earth pressure ii. Total passive earth pressure

8M

Cont…2

:: 2 ::

6. a) How is the structural and foundation stability of a retaining wall checked? 7M b) A retaining wall 6m high, with smooth vertical back is pushed against a soil mass having

c' = 40kN/m2 and ' = 15°; γ = 19kN/m3. What is the total Rankine passive pressure, if the horizontal soil surface carries a uniform load of 50kN/m2? What is the point of application of the resultant thrust?

8M

Unit – IV

7. a) What are the limitations of plate load test? Draw a typical load-settlement curves for: i. Cohesive soil and ii. Dense cohesionless soil

5M

b) Determine the safe bearing capacity for a square footing of size 2m x 2m at a depth of 1.5m for the following cases: i. Water table at a depth of 2m ii. Water table at a depth of 3.5m Take γ = 18kN/m3 above the water table, γsat = 21kN/m3, = 36˚, c = 8 kN/m2, factor of safety=3. Use Terzaghi’s bearing capacity theory. Bearing Capacity factors can be chosen from the table given below:

Nc Nq N 35 57.8 41.4 42.4 40 95.7 81.3 100.4

10M

8. a) Differentiate between general and local shear failure. 6M b) A square footing is to be constructed on a deep deposit of sand at a depth of 0.9m to

carry a design load of 300kN with a factor of safety of 2.5. The ground water table may rise to the ground level during rainy season. Design the dimension of footing given sat = 20.8 kN/m3, Nc = 25, Nq = 34 and N =32.

9M

Unit – V

9. a) Explain how the load carrying capacity of a group of piles in: i. Cohesionless soil ii. Cohesive soil is determined

7M

b) 200mm diameter, 8m long piles are used as foundations for a column in a uniform deposit of medium clay (qu = 100kN/m2). The spacing between the piles is 500mm. there are 9 piles in the ground arranged in a square pattern. Calculate the ultimate pile load capacity of the group. Assume adhesion factor =0.9.

8M

10. a) Explain the considerations govern the fixing of the depth of a well foundation. 7M b) Explain the methods to rectify tilt and shift:

i. Controlled dredging ii. Pulling the well

8M




(Regulations: VCE-R11/R11A) WATER RESOURCES ENGINEERING-II

(Civil Engineering) Date: 29 April, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) Explain the importance of dead storage in a reservoir with a neat sketch. 3M b) You are in charge of a project in the following situations. Explain what type of reservoir

you recommend and why? i. A perennial river where floods are common ii. A non perennial river in a southern state iii. A river flowing very near to city

12M

2. a) Classify the dam based on construction materials. 5M b) The mean monthly discharges of a river in a dry year are as given below:

Month Mean Flow Month Mean Flow Jan 32.0 July 44.0 Feb 62.0 Aug 71.0 Mar 83.0 Sept 97.0 April 59.0 Oct 75.0 May 24.0 Nov 47.0 June 23.0 Dec 35.0

Determine the minimum capacity of a reservoir if the entire annual flow is to be drawn off at an uniform rate.

10M

Unit – II

3. a) Explain the various forces acting on the gravity dam. 5M b) A masonry dam 10m high is trapezoidal in section with a top width 1.0m and bottom

width of 8.25m. The face exposed to water has a batter of 1:10. Test the stability of the dam. Assume unit weight of masonry as 2240kg/m3, specific weight of water=1000kg/m3 and permissible shear stress of Joint=14 kg/m2.

Fig.1

10M

4. a) With neat sketches explain the types of earth dams. 6M b) Explain the various seepage control measures required for the earth dam. 9M

Cont…2

:: 2 ::

Unit – III

5. a) What do you understand by a fall in a canal? Why it is necessary? How do you select its location?

7M

b) Explain the procedure of designing Sarda type fall.

8M

6. a) What do you understand by a head regulator? State functions of a distributary head regulator and a cross-regulator.

5M

b) Design a cross-regulator for a distributary channel taking off from the parent channel, for the following data. Assume necessary data where applicable. i. Discharge of parent channel = 100cumecs ii. Discharge of distributary = 15cumecs iii. F.S.L. of parent channel: u/s = 218.1m d/s = 217.9m iv. Bed width of parent channel: u/s = 42m d/s = 38m v. Depth of water in parent channel: u/s = 2.5m d/s = 2.5m vi. F.S.L. of distributary = 217.10m vii. Bed width of distributary = 15m viii.Depth of water in distributary = 1.5m ix. Permissible exit gradient = 1/5

10M

Unit – IV

7. a) With a neat sketch explain the difference between weir and a barrage. 5M b) Fig.2 shows the section of a hydraulic structure on a permeable foundation. Calculate

the average hydraulic gradient according to Bligh’s creep theory. Also find the uplift pressures at A, B, and C as shown in the Fug.2. Also the floor thickness at these points:

Fig.2

10M

8. a) With a neat sketch mention the components of a diversion head work. 5M b) An impervious floor of a weir on permeable soil is 16m long and has sheet piles at both

the ends. The upstream pile is 4m deep and the downstream pile is 5m deep. The weir creates a net head of 2.5m. Neglect the thickness of the weir floor, calculate the uplift pressure at the junction of the inner faces of the pile with the weir floor, by using Khosla’s theory.

10M

Unit – V

9. a) Write a notes on ogee shaped spillway. 7M b) Compute the discharge over an ogee weir with coefficient of discharge equal to 2.4 at a

head of 2.0m. The length of spillway is 100m. The weir crest is 8m above the bottom of the approach channel having the same width as that of the spillway.

8M

10. a) Explain in detail about super passage? With a neat sketch show the components. 5M b) Design a siphon aquaduet (water way and canal water way) for the following data:

Discharge of the canal=25m3/s, bed width of canal=20m, depth of water in the danal=1.5m, bed level of canal=160m, high flood discharge of drainage=400m3/s, HFL of drainage =160.50m, bed level of drainage=158.0m and general ground level is 160m.

10M




AIR TRANSPORTATION SYSTEMS (Civil Engineering)



Unit – I

1. a) Explain the impact of air transportation industry on personal and pleasure travel. 8M b) List the elements air transportation system, explain any two in detail.

7M

2. a) What are the different types of passenger transfers encountered in airports, that affect the passenger handling capacity, explain them briefly.

8M

b) Write a note on Ideal aspects of an aircraft.

7M

Unit – II

3. a) Explain the Earths physical issues affecting surface, core and continents. 6M b) What is the purpose of demand forecasting? Give brief account of different

methods of forecasting.

9M

4. a) What are the structure and functions of ICAO and IATA, explain in brief. 8M b) Write a note on International air service agreements.

7M

Unit – III

5. a) Explain briefly the Instrument landing system, Microwave landing system and Satellite based navigation system.

9M

b) Write a note on Automatic Flight Control System.

6M

6. a) How the cost of aircraft should be compatible with the operational infrastructure? 8M b) Explain the terms associated with effectiveness in service quality of an aircraft.

7M

Unit – IV

7. a) What are the components of airline planning process? Explain any one in brief. 9M b) ‘Getting the right sized aircraft for the job with payload –range capability’ Discuss

it.

6M

8. a) What are the runway declared distances? Explain them briefly. 7M b) What are the requirements of passenger terminals in airport?

8M

Unit – V

9. a) Narrate the salient features of stage-3 and stage-4 procedural systems in air traffic control system.

8M

b) Write notes on categories of airspace in connection with ATC.

7M

10. a) What are the separation minima followed in case of ATC operations, discuss. 8M b) What were the state-of-the-art practices in the fields and the emerging

capabilities when FANS committee was constituted? 7M




ENVIRONMENTAL ENGINEERING-I (Civil Engineering)



Unit – I

1. a) List different methods of forecasting population of a city. Comment on their relative merits and demerits.

7M

b) The following is the population data of a city, available from past census records. Determine the population of the city in the year 2031 by: i. Arithmetic increase method ii. Geometrical increase method Year 1951 1961 1971 1981 1991 2001 2011

Population 12000 16500 26800 41500 57500 68000 74100

8M

2.

a)

What is Design period, mention design period for various components of a water supply scheme?

8M

b) What is fire demand? Calculate the fire demand of a city having a population of 140000 using various formulae.

7M

Unit – II

3. a) With a neat sketch explain Jar test apparatus for determining “optimum dosage” of coagulant in the laboratory.

7M

b) Chlorine usage in the treatment of 25000m3/day is 9kg/day. The residual chlorine after 10minutes of contact is 0.20mg/l. Calculate the dosage in milligrams per liter and the chlorine demand of the water.

8M

4. a) Differential between slow sand filters and rapids sand filters. 7M b) Design a set of circular settling tanks to treat 5million liters of water per day. Detention

period may be taken as 2hour and depth of liquid in the tank as 3m. Calculate overflow rate and weir loading. Also sketch the designed settling tank.

8M

Unit – III

5. a) With a neat sketch explain automatic flushing tank. 8M b) During BOD test conducted on a 5% dilution of waste, the following observations were:

DO aerated water used for dilution = 3.6mg/l DO of original sample = 0.8mg/l DO of diluted sample after 5 day incubation = 0.7mg/l Compute: i. 5 day BOD ii. Ultimate BOD Assume deoxygenation constant at test temperature as 0.12.

7M

6. a) What are sewer appurtenances? List the various appurtenances and explain any one of them with a neat sketch.

8M

b) What are inverted siphons? Mention its applications. 7M

Cont…2

:: 2 ::

Unit – IV

7. a) What do you understand by the term unit operations and unit processes? Explain them. 8M b) Draw a typical flow diagram of a sewage treatment plant for a city. List and explain the

function of each unit.

7M

8. a) What is a grit chamber and explain the principle of working with a neat sketch? 7M b) Design suitable dimensions of a circular trickling filter unit for treating 5million liters of

sewage per day. The BOD of sewage is 150mg/L. Assume the value of organic loading rate=1500kg/ha-m and depth of filter as 2m. Assume any other data if required.

8M

Unit – V

9. a) Explain the working of an oxidation pond with a neat sketch. 8M b) Describe the Hardy cross method of pipe design.

7M

10. a) What is septic tank and explain the principle of working with a neat sketch. 8M b) List various types of joints used in sewer lines and describe any one of them with a neat

sketch. 7M

Date post:	21-Nov-2020
Category:	Documents
Upload:	others
View:	0 times
Download:	0 times

VARDHAMAN COLLEGE OF ENGINEERING€¦ · embedded computing system. 8M b) Explain the major...

Documents