VARDHAMAN COLLEGE OF ENGINEERING · (Regulations: VCE-R14) ENVIRONMENTAL SCIENCE (Common to...

Hall Ticket No: Question Paper Code : A2510

VARDHAMAN COLLEGE OF ENGINEERING (AUTONOMOUS)

B. Tech IV Semester End Semester Regular Examinations, April - 2016 (Regulations: VCE-R14)

COMPUTER ARCHITECTURE AND ORGANIZATION (Common to Computer Science and Engineering & Electronics and Communication Engineering)

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 the steps needed to execute the machine instruction. Add R1, R2, R3 and also show

connections between the processor and the main memory. 7M

b) Explain in brief the 4 bit arithmetic circuit which can perform addition, subtraction, increment and decrement operations.

8M

2. a) Convert (9.75)10 in to floating point representation. 6M b) A digital computer has a common bus system for 16 registers of 32 bits each. The bus

constructed with multiplexers: i. How many selection lines are there in each multiplexer ii. What size of multiplexers are needed iii. How many multiplexers are there in the bus Also draw the bus system.

9M

Unit - II 3. a) Explain basic instruction format. 5M b) What is Addressing mode? Explain following addressing modes:

i. Direct addressing mode ii. Indexed addressing mode iii. Auto increment addressing mode iv. Auto decrement addressing mode v. Indirect addressing mode

10M

4. a) What is instruction cycle? Explain various steps involved in the instruction cycle. 7M b) What are the basic differences between a branch instruction, a call subroutine

instruction and a program interrupt?

8M

Unit - III 5. a) Define the following:

i. Microoperation ii. Microinstruction iii. Microprogram iv. Microcode

8M

b) Write Booth multiplier recoding table. Using Booth’s algorithm to multiply +13 *-6.

7M

6. a) Write the circuit of Microprogram sequencer for control memory, explain in brief. 8M b) List out the steps in non restoring division method to perform 83.

7M

Unit - IV 7. a) Discuss the design aspects of 1Kx1 memory chip with a neat block diagram. 7M b) List the applications of Vector processing, write in brief about vector operations. 8M

Cont…2

::2::

8. a) What is page fault? What does page fault signifies when occurred. Explain page replacement algorithms.

8M

b) Define hit rate and miss penalty. Calculate the total access time if miss rate is 0.12 miss penalty is 0.015ms and cache access time is 10microseconds.

7M

Unit – V

9. a) What is the purpose of system bus controller in system bus structure for multiprocessors? Explain how the system can be designed to distinguish between references to local memory and references to common shared memory.

8M

b) What is cache coherence? Why is it important in shared-memory multiprocessor systems? How can the problem be resolved with a snoopy cache controller?

7M

10. a) Explain 8x8 omega switching network for multistage switching networks to control processor-memory communication in a tightly coupled multiprocessor system.

8M

b) Explain in brief the serial arbitration (daily-chain) procedure. 7M

Hall Ticket No: Question Paper Code: A2011

VARDHAMAN COLLEGE OF ENGINEERING

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

(Regulations: VCE-R14)

ENVIRONMENTAL SCIENCE (Common to Computer Science and Engineering, Information Technology &

Electrical and Electronics Engineering) Date: 23 April, 2016 FN Time: 3 hours Max Marks: 75


Unit – I

1. a) Discuss about multidisciplinary nature of environmental studies. 7M b) Briefly explain the impacts on environment by the following human activities:

i. Mining ii. Industrialization

8M

2. a) Explain with examples in detail about renewable and non-renewable energy resources.

7M b) Explain the effect of usage of fertilizers and pesticides on land.

8M

Unit – II

3. a) Substantiate that India as a mega biodiversity nation. 7M b) Explain the energy flow models and material cycling through the various components of

the ecosystem.

8M

4. a) Define the term biodiversity, classify the types of biodiversity and explain in detail with example.

8M

b) Give the characteristic features types, structure and function of ecosystem.

7M

Unit – III

5. a) What is air pollution? What are the various sources of air pollution? Classify various types of air pollutants.

7M

b) Describe briefly about the collection and transportation of solid waste.

8M

6. a) Explain the term ‘Reuse’. Mention the advantages and disadvantages of reuse. 7M b) What is global warming? Discuss the observed and expected environmental effects of

global warming. 8M

Unit – IV

7. a) Is Information Technology necessary in environmental management? Explain. 7M b) Explain clean development mechanism and polluter pay principle to protect the

environment.

8M

8. a) What is nanotechnology? Mention its applications and benefit to environmental issues. 7M b) Discuss the scope and benefit of ISO14000 environment Quality management.

8M

Unit – V

9. a) Discuss the salient features of Air (Prevention and control of Pollution) Act. 7M b) Define Environmental protection Act (EPA), and explain general powers of the Central

Government under EPA.

8M

10. a) Discuss the issues involved in enforcement of environmental legislation. 7M b) What are the steps followed in conducting EIA? Explain in Brief. 8M





FORMAL LANGUAGES AND AUTOMATA THEORY (Common to Computer Science and Engineering & Information Technology)

Date: 26 April, 2016 FN Time: 3 hours Max Marks: 75


Unit - I 1. a) Obtain a DFA for accepting the set of all strings of 0’s and 1’s such that the 10th symbol

from the right end is 1 and remaining nine symbols are 0’s. 6M

b) Obtain an NFA to accept all strings of a’s and b’s ending with ab or ba. From this NFA, obtain an equivalent DFA.

9M

2. a) List the steps used for converting the given ε-NFA to an equivalent DFA. 4M b) Write the complete algorithm to minimize the given DFA and also minimize the

following DFA: A=( q1,q2,q3,q4,q5 ,q 6,a, b , , q1, q3,q6) ( q1 , a ) = q2 ( q4, a ) = q4 ( q5 , a ) = q4 ( q1 , b ) = q6 ( q4, b) = q2

( q5 , b ) = q5 ( q2 , a ) = q1 ( q3 , a ) = q 2 ( q2, b ) = q 3 ( q3 , b) = q4

( q6, a ) = q 5 ( q 6, b) = q4

11M

Unit - II 3. a) Write the regular expression for the following:

i. The set of all strings of a’s and b’s such that every block of four consecutive symbols contains at least two a’s

ii. L = anbm | m+n is even

7M

b) Construct ε-NFA for the following regular expressions: i. (a+b)*aa(a+b)* ii. a*+b*+c*

8M

4. a) Give and explain the recursive definition of regular expressions. 6M b) State and prove the pumping lemma for regular languages.

9M

Unit - III 5. a) What is meant by ambiguous grammar? Show that | |S aSbS bSaS ambiguous

Grammar. 6M

b) What is meant by CNF? Write a procedure to convert CFG into CNF and also give the CNF

for the following language *| , ,R RL ww w a b w reverse of string.

9M

6. a) Give the GNF grammar for the following CFG: | , |S AS a A SA b

9M

b) State and explain decision properties of CFL.

6M

Unit - IV 7. a) Give and explain the formal definitions of the languages accepted by a PDA by empty

stack and final state. 6M

b) Design PDA for the following language accepted by final state. : 0 , 0n m n mL a b c m n

9M

Cont…2

::2::

8. a) Write the algorithm to convert from the given CFG to a PDA. 5M b) Convert the PDA P = q0,q1, 0,1, Z0,X, , q1, Z0) to a CFG, if is given by:

(q1,1, Z0 )=(q1, X Z0) (q1,0,X )=(q0, X ) (q1,1, X )=(q1, X X) (q1, , X )=(q1, ) (q0,1, X )=(q0, ) (q0,0, Z0 )=(q1, Z0)

10M

Unit - V 9. a) Design Turing machine that converts unary number into binary conversion. 8M b) Discuss various types of Turing machines.

7M

10. a) Discuss Chomsky hierarchy of languages. 6M b) Write a short notes on Halting problem. 9M





SOFTWARE ENGINEERING (Common to Computer Science and Engineering & Information Technology)



Unit - I 1. a) Define a pattern. Explain the standard format of the pattern as suggested by Ambler. 8M b) Give the IEEE definition of software engineering. Software Engineering is a layered

technology. Comment on this statement.

7M

2. a) What are software characteristics? 7M b) Compare waterfall model and spiral model in detail.

8M

Unit - II 3. a) Explain the requirement elicitation and analysis activity in detail. What are the difficulties

in it? 10M

b) What are the different types of checks to be done on requirements in requirement document?

5M

4. a) Define software architecture. Explain any three architectural styles used in software construction.

9M

b) Explain the following design concepts: i. Abstraction ii. Function independence iii. Refactoring

6M

Unit – III 5. a) What are the different levels of software reuse? Explain them in detail. 6M b) Explain the three models of open source licenses. What suggestions you would give for

the organizations that operates on open source software?

9M

6. a) Discuss the different mechanisms that could be used to achieve the golden rule of UI 'Place the user in control.

7M

b) What are the mechanisms to perform the integration testing? Explain them in detail.

8M

Unit – IV 7. a) Explain the CK metrics suite in detail for object oriented systems. 10M b) Discuss the metrics for software quality.

5M

8. a) What are the characteristics of an effective software metric? Explain. 7M b) What strategy you would adopt to mitigate the risks?

8M

Unit – V 9. a) Discuss the Mccall's software quality factors. 10M b) Explain elements of software quality assurance.

5M

10. a) What guidelines you would suggest to conduct an effective review? 10M b) Discuss the cost effectiveness of reviews in your own words. 5M

Hall Ticket No: Question Paper Code:

A2513



UNIX PROGRAMMING (Common to Computer Science and Engineering & Information Technology)



Unit - I 1. a) Discuss the following features of Unix :

i. Pattern Matching ii. Programming Facility Also, explain the three tiered file access rights followed in Unix.

8M

b) Write suitable unix commands for the following: i. Display the last 5 lines of the file named stu.txt on the screen as well as store it in

the file named temp.txt ii. Create a hard link for the file emp.txt iii. Record the login session in a file log.txt

7M

2. a) Illustrate the three modes used in vi editor for text processing. How are the following functionalities achieved in vi editor: i. copy and paste ii. cut and paste iii. Writing selected lines to a file

9M

b) Explain the following commands with suitable syntax and example: i. head ii. cmp iii. ps

6M

Unit – II 3. a) What is the importance of here document? Give suitable example. Write a shell script

to create a menu which displays: i. The number of users who are logged in ii. Lists all .c files iii. Display the present working directory iv. Exit to shell

8M

b) Write the syntax and usage of the following functions: i. Open( ) ii. read( ) iii. lseek( ) iv. close( )

7M

4. a) Briefly discuss the role of shell with respect to the following: i. pattern matching ii. redirection iii. pipe iv. quoting

8M

b) Discuss the use of positional parameters in Shell programming with suitable examples. 7M

Cont…2

::2::

Unit - III 5. a) What is a zombie process? Explain with a program. 7M b) What is signal? Explain SIGALRM program.

8M

6. a) In earlier versions of the UNIX System, why were signals unreliable? 6M b) Discuss the importance of the following functions with syntax:

sleep ( ) raise( ) abort ( )

9M

Unit – IV 7. a) What is shared memory? Explain functions of shared memory. 8M b) What do you understand by named pipe? Write a program using FIFO using process 1

and process 2.

7M

8. a) Discuss the importance of the following functions with relevant syntax: shmctl() shmat()

6M

b) With suitable system calls, explain the use of message queues in IPC.

9M

Unit - V 9. a) Write the relevance and syntax of the following functions”:

accept( ) listen( )

5M

b) Write routines for the following: i. transient connect errors ii. Initialize a socket endpoint for use by a server

10M

10. a) Write the relevance and syntax of the following functions: socket( ) bind( )

6M

b) In a connection oriented network service how is connection established between client and server before data is transferred. Discuss the functions used.

9M


A2514



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

Date: 03 May, 2016 Time: 3 hours Max Marks: 75


Unit - I 1. a) Explain three schema architecture, the Logical data independence and Physical data

independence. 8M

b) Define entity, attribute and explain notations of ER diagram with an example.

7M

2. a) Explain DDL DML and DCL commands with syntax. 7M b) Define relationship and relationship set. Explain key constraint and participation

constraint with an example.

8M

Unit – II 3. a) Define view? Illustrate view with an example. 7M b) What is a relation convert ER model to relational model?

8M

4. a) Discuss with an example, the standard operations on sets are available in relational algebra.

6M

b) Consider the following relational schema: Account: Account_number, account_type, balance Customer: Customer_number, Name, Adhaar_number, address. Deposits: Account_number, Customer_number, Write the optimized SQL queries for the following: Write create command to create the table ‘deposits’ by considering all schema level constraints: i. Write SQL insertion query to insert few tuples to all the relations ii. Add 5% interest to the customer who have less than 10,000 balances and 6%

interest to remaining customers iii. Find the customers whose balance is more than the average balance of the

entire customers

9M

Unit – III 5. a) What is the need for normalization? Discuss all normal forms with a diagram and

example. 8M

b) Define BCNF? Compare BCNF and 3NF with an example.

7M

6. a) Illustrate lossless join decomposition. 6M b) i. Find the minimal cover of the following set of functional dependencies.

F=[A->D BC->AD C->B E->A E->D] ii. What is the key of R .Consider the universal relation? R(A,B,C,D,E,F,G,H,I,J) and the set of functional dependencies. F=[A,B-> C,A-> D,E, B -> F,F->G,H D-> I ,J]Decompose R into 2NF and then 3NF RELATIONS?

9M

Cont…2

::2::

Unit – IV 7. a) Describe Properties of a Transaction with state Transition diagram. 6M b) Discuss the anomalies of interleaved execution of transaction in detail with an

example.

9M

8. a) Write about Shadow paging. 7M b) Discuss Time-stamp ordering protocol for concurrency control. How does strict time

stamp ordering differ from basic time stamp ordering?

8M

Unit – V 9. a) What alternatives are available for the data entries in index? Are all of them suitable

for secondary indexes? Explain. 8M

b) What is clustered index organization? Illustrate with examples, the importance of clustered index on a range query, search key and aggregate operations.

7M

10. a) Discuss any two basic file organizations. Also compare I/O cost. 8M b) Explain all operations of B+ trees (search, insert, and delete). 7M


A2507



DESIGN AND ANALYSIS OF ALGORITHMS

(Information Technology)



Unit – I

1. a) List and explain any three active areas of research for the study of algorithms. 9M b) List any six pseudo code conventions used in algorithm writing.

6M

2. a) Write the binary search algorithm. 6M b) Show that the best, average and worst case number of comparisons for max-min

algorithm is 3n/2-2. Also write a tree of recursive calls for max-min algorithm for the following data: 22, 13, -5,-8, 15, 60, 17, 31, 47.

9M

Unit – II

3. a) Differentiate between feasible solution and optimal solution. 4M b) State knapsack problem. Consider the following instance of knapsack problem. n=3,

m=20, (p1,p2,p3)=(25,24,15) and (w1,w2,w3)=(18,15,10). Obtain all feasible solutions. Also write an algorithm for the solution to this problem.

11M

4. a) Trace the following graph using single source shortest path algorithm to find shortest path from vertex ‘a’ to all other vertices.

Fig. 1

8M

b) Solve the job sequencing problem given n=5, profits (1, 5, 20, 15, 10) and deadlines (1, 2, 4, 1, 3) using greedy strategy.

7M

Unit – III

5. a) With the help of a pseudo-code, explain Floyd’s algorithm. Apply the same for the given adjacency matrix graph.

0 2 1 86 0 3 2

0 42 0 3

3 0

abcde

a b c d e

12M

b) What are the advantages of dynamic programming compared to divide and conquer?

3M

6. a) Explain chained matrix multiplication in dynamic programming with an algorithm. 8M b) Explain the travelling salesman problem with an example.

7M

Cont…2

:: 2 ::

Unit – IV

7. a) Explain 4-queens problem to find at least one solution using state space tree. 7M b) Draw the portion of state space tree generated by FIFOBB for the knapsack instances:

n=5, M=12, (P1, P2…P5)=(10, 15, 6, 8, 4) and (W1, W2…W5)=(4, 6, 3, 4, 2).

8M

8. a) Differentiate between backtracking and branch and bound techniques with their applications.

8M

b) Explain the graph coloring problem. Consider the below graph and color the graph with three colors (red, blue, green).

Fig.2

7M

Unit – V

9. a) Explain Cook’s theorem and its significance for NP-Hard and NP- Complete problems. 8M

b) Justify how all comparison-based sorting algorithms require 2logn n time.

7M

10. a) Distinguish between P, NP and NP-Complete problems. Give example for each category.

8M

b) Can we write a polynomial algorithm for every NP-Complete problem? Justify. 7M



(AUTONOMOUS) B. Tech IV Semester End Semester Regular Examinations, April/May - 2016


MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS

(Common to Electronics and Communication Engineering & Mechanical Engineering)

Date: 03 May, 2016 Time: 3 hours Max Marks: 75 Answer ONE question from each Unit

All Questions Carry Equal Marks

Unit – I

1. a) Distinguish between Individual demand and Market demand. 5M b) Explain determinants of demand.

10M

2. a) What is the purpose of demand forecasting? 5M b) Discuss critically the different methods of demand forecasting.

10M

Unit – II

3. a) Explain External Economies of Scale. 5M b) Find out the break even units for a company whose selling price per unit is Rs.100,

variable cost per unit is Rs.60 and total fixed cost is Rs.1,20,000. Also find the number of units the company should sell to earn a profit of Rs. 50,000.

10M

4. Assuming that the cost structure and selling prices remain the same in periods I and II find out: i. P/V ratio ii. Break even sales iii. Profit when sales are 1,00,000 iv. Sales required to earn a profit of Rs.20,000 v. Margin of safety in period I and II

Period Sales(Rs) Profit(Rs) I 1,20,000 9,000 II 1,40,000 13,000

15M

Unit - III

5. a) What is Pure Monopoly? What are the causes and kinds of monopoly? 6M b) Write a note on price and output determination in the short run under monopolistic

competition. Illustrate with graphs.

9M

6. a) What is market structure? Explain the different types of market structure. 7M b) How pricing is done for a new product? Which are the two kinds of pricing strategies for

a new product? Explain.

8M

Unit – IV

7. a) Distinguish between a partnership firm and Joint stock company. 6M b) How changing business environment in post-liberalization scenario has affected India in

last two decades.

9M

Cont…2

:: 2 ::

8. a) Explain the sources of rising long term finance. 6M b) Calculate the net present value and payback period for the following cash flows.

Years 0 1 2 3 4 Cash flows (Rs.) 11,50,000 3,00,000 4,00,000 4,50,000 3,50,000

Cost of capital is 14 per cent.

9M

Unit – V

9. Pass Journal Entries for the following transactions. Jan 1 Started business with cash Rs.100,000

2 Deposited Rs.75,000 to bank 3 Purchased furniture Rs.20,000 and paid by cheque (Through Bank) 4 Purchased goods for cash Rs.15,000 and on credit for Rs.30,000 from

Ganesh 5 Paid shop rent Rs.2,500 cash 6 Sold goods for cash Rs.5,000 & on credit Rs.20,000 to Priya 7 Withdrew from bank for personal use Rs.1,000 8 Sold goods on credit Rs.6,000 to Jithesh 9 Received Rs.19,500 from Priya in full settlement of her account.

10 Received interest from bank Rs.600

15M

10. a) Distinguish between profit and loss account and balance sheet? 6M b) If current ratio = 2.8 acid-test ratio = 1.5 working capital = Rs.1,62,000 find out:

i. Current Assets ii. Current Liabilities iii. Liquid Assets

9M





PRINCIPLES OF ELECTRICAL ENGINEERING

(Electronics and Communication Engineering)

Date: 26 April, 2016 FN Time: 3 hours Max Marks: 75 Answer ONE question from each Unit


Unit – I

1. a) Explain about the concept of self inductance and mutual inductance. 7M b) Two 200turns, air cored solenoids, 25 cm long have a cross sectional area of 3cm2 each.

The mutual inductance between them is 0.5micro Henry. Find the self inductance of the coils and the coupling co-efficient.

8M

2. a) Derive the equation for the total inductance of two coupled coils if both are connected in parallel aiding and in parallel opposing.

9M

b) Two coils having 3000 and 2000 turns are wound on amagnetic ring. 60% of the flux produced in first coil links with the second coil(having 2000 turns).A current of 3amp produces a flux of 0.5m wb in first coil and 0.3mwb in the second coil. Determine the mutual inductance and co-efficient of coupling.

6M

Unit – II

3. a) Derive the expression for transient current equation of DC excited series RL circuit. 7M b) A series RL circuit with R = 50 ohm and L = 10 Henry has a constant voltage V = 100 volt

applied at t= 0 by the closing of a switch. Find: i. The equations for I,vR and vL ii. The current at t = 0.5 sec iii. The time at which vR = vL

8M

4. a) Derive the expression for transient current equation of DC series excited RC circuit. 7M b) Derive the expression for transient current equation of AC excited series RL circuit.

8M

Unit – III

5. a) Derive the EMF equation of a DC generator and explain the concept of back emf. 8M b) An 8 pole Dc generator has 320 conductors and its flux and speed are such that, the

average E.M.F generated in each conductor is 2V. The current in each conductor is 100A. Find the total current and the generated E.M.F, if the winding is: i. Lap connected ii. Wave connected. Also find the total power generated in each case

7M

6. a) Explain the characteristics of DC shunt motor and DC series motor. 6M b) The shunt field current in a DC shunt machine is 2A and the line current is 20A at 200V.

calculate: i. The generated e.m.f when working as generator ii. Torque in N-M when running at 1500 r.p.m as motor. Take the armature resistance

as 0.5Ω.

9M

Unit – IV

7. a) Explain the operation of a single phase transformer on no load and load condition with phasor diagrams.

10M

b) Explain about various losses that occur in a single phase transformer. 5M

Cont…2

:: 2 ::

8. a) Explain about OC and SC tests conducted on a single phase transformer. 8M b) Explain about the working principle and constructional features of a single phase

transformer.

7M

Unit – V

9. a) Explain differences between squirrel cage and slip ring Induction motor. 7M b) Explain the working principle of single phase capacitor start motors.

8M

10. a) Draw and explain the power stage diagram of a 3 phase induction motor. 7M b) The power input to a 500V, 50Hz,6 pole, 3-phase squirrel cage induction motor running at

975rpm is 40kW. The stator losses are 1kW and the friction and the windage losses are 2kW. Calculate : i. Slip ii. Rotor copper loss iii. The efficiency

8M





PULSE AND DIGITAL CIRCUITS


Date: 30 April, 2016 Time: 3 hours Max Marks: 75 Answer ONE question from each Unit


Unit – I

1.

a) Verify RCTevv 2/1 1

, RCTevv 2/1 1

for a symmetrical square wave applied to high

pass RC circuit.

8M

b) Draw the output waveform for the first two cycles if the voltage wave shown in Fig. 1. is applied at t=0 to a low pass circuit. Initially the capacitor is not charged. The time constant of the circuit is 2msec.

Fig.1

7M

2. a) Draw the response of a series RLC network to a step input voltage, Derive the response in undamped case.

9M

b) The limited ramp shown in Fig.2. is applied to an RC differentiator. Draw to scale the output waveform for: i. T = RC ii. T = 0.2 RC iii. T = 5RC

Fig.2

6M

Unit – II

3. a) The input voltage Vi is applied to a two level clipper as shown in Fig.3. varies linearly from 0 to 150V, sketch the output Vo to the same time scale as the input voltage. Assume ideal diodes.

Fig.3

9M

Cont…2

:: 2 ::

b) Draw the wave form of the output voltage Vo of the clamping circuit shown in Fig.4 Assuming very large time constant RC and ideal diodes. The input is a symmetrical square wave of 20 volts excursion.

Fig.4

6M

4. a) State and prove the clamping theorem. 7M b) A square wave of amplitude 10V and frequency 10KHz is applied to the clamper circuit

shown in Fig5. Following parameters are given. Rf= Rs=100Ω, R =20KΩ, C =1μf, Draw the first few cycles of the response.

Fig.5

8M

Unit – III

5. a) With a neat circuit diagram explain the working of a collector coupled astable multivibrator. Derive the equation for the time period.

7M

b) Design a a Schmitt trigger circuit shown in Fig.6, with UTP=6 and LTP=3V. Assume Ge transistors with hFE(min) = 50 and IC = 4mA. Supply voltage =15V

Fig.6

8M

6. a) With a neat circuit diagram explain the working of an collector coupled monostable multivibrator. Derive the equation for the pulse width.

8M

b) Design a self-bias bistablemultivibrator with a supply voltage of –12 V. A p-n-p silicon transistors with hFE(min)= 50, VCE(sat)= –0.3V,VBE(sat)= –0.7 V and IC2= –4 mA are used.

7M

Unit – IV

7. a) Define the three errors that occur in a sweep circuit and obtain an expression for these errors for an exponential sweep circuit.

8M

b) For the bootstrap sweep generator shown in Fig.7, estimate: i. Sweep error ii. Sweep amplitude iii. Retrace duration Plot to scale the output and input waveforms on the same time scale. Given VCC = 10V, VEE = 10V R =10KΩ, C =0.05μf , Rb = 10KΩ, Re =5KΩ, hfe= 100, hie=2K, hoe= 1/40K. Assume that input is a 1kHz symmetrical square wave.

Fig.7

7M

Cont…3

:: 3 :: 8. a) With a neat circuit diagram explain the working of a simple current sweep generator

using necessary waveforms and derivations. 8M

b) Write important applications of time base circuits. With reference to time base circuits define the following terms: i. Fly back time ii. Transmission error

7M

Unit – V

9. a) With a neat diagram, explain how an unidirectional diode gate can be used to transmit positive pulses.

8M

b) With a neat circuit diagram explain the working of 2-input TTL NAND gate 7M

10. a) With reasons explain why the ECL is fastest of all the logic families? What are the main drawbacks? Write the important characteristics of ECL.

7M

b) In the circuit shown in Fig.8. 10b, RL = R1 = 100KΩ, R2 = 50KΩ and the signal has a peak value of 20V. Find: i. A ii. V(c) min iii. V(n) min iv. Ri when the diodes are ON

Fig.8

8M




ELECTROMAGNETIC THEORY AND TRANSMISSION LINES (Electronics and Communication Engineering)



Unit - I 1. a) State and prove Gauss’s Law. 6M b) A charge of -0.3 C is located at A (25,-30, 15) in cm, and a second charge of 0.5 C is

B(-10, 8, 12) cm. find Electric field intensity E

at

i. Origin ii. P(15, 20, 50) cm

9M

2. a) Calculate the work done in moving a charge of 15 C in an electro static field with 28 4 2 /y zxE xy a x a a V m

from point B(1, 7, 4) to (2, 17, 5), if the path selected

is y=3x2+z. and z =x+3

9M

b) Obtain an expression for electric potential at any point distance ‘r’ from a point charge Q at the origin.

6M

Unit - II 3. a) The positive y-axis (semi-infinite line with respect to the origin) carries a filamentary

current of 2A in–ay direction. Assume it is a part of large circuit. Find the magnetic field intensity at: i. A(2, 3, 0) ii. B(3, 12, -4)

7M

b) A circular loop located on x2+y2= 9, z=0 carries a direct current of 10A along aφ direction. Find H at (0, 0, 4). Also derive the required relation.

8M

4. a) Derive the expression for the magnetic field intensity H at a point P along the axis of a solenoid of length L and radius ‘a’ which consists of ‘N’ turns of wire carrying current I.

8M

b) Planes z=0 and z=4 carry current 10 xk a A/m and 10 xk a A/m respectively. Determine H at (1,1,1) and at (0,-3, 10).

7M

Unit - III 5. a) List the Maxwell’s equation for good conductor and time varying fields. 10M

b) If the 3 cos 6 ysin zH x a

: find J

, if fields are invariant with respect to time.

5M

6.

a) Do the field 0

sin sin cos cosMM y z

EE E x t a and H x t a

satisfy Maxwell’s equation. 7M

b)

Two extensive homogenous isotropic dielectric meet on plane z=0. For z>0 1

4r and

for z<0 2

3r . A uniform electric filed 1 5 – 2 3 /x y zE a a a kV m exists for z>0: i. Find E2 for z<0 ii. The angles E1 and E2 make with the interface iii. The energy density in medium-1

8M

Cont…2

::2::

Unit - IV 7. a) Derive the expression for electromagnetic wave propagating through lossy dielectric

medium. 8M

b) A plane wave propagating through a medium with 8r and 2r has

–z/3 8xE=e sin 10 t – βz a V/m . Determine β, intrinsic impedance and wave velocity.

7M

8. a) State and prove Poynting theorem. 8M b) In a homogenous non magnetic medium E=4sin(2πx107t–0.8x) ax v/m. Find relative

permitivity, intrinsic impedance and the time average of power carried by the wave.

7M

Unit - V 9. a) The primary constants for a coaxial cabel at f=1GHz are L=250 nH/m, C=95 pF/m,

R=0.06 /m and G=0 determine: i. ii. iii. Phase velocity iv. r

7M

b) Describe the single stub and double stub in a lossless line.

8M

10. a) A lossless transmission line with characteristic impedance 50 ohm and is 30m long operates at 2 MHz. The line is terminated with a load of 60 + 40j ohm. If u = 0.6c on the line. Find the reflection coefficient, standing wave ratio and input impedance using smith chart.

10M

b) A telephone line has R=6 /km, L=2.2mH/km, C=0.005 F/km and G=0.05 /km. Determine Z0, , @ 1KHz. If the line length is 100km, determine the attenuation and phase shift of the signal. Calculate the phase velocity of the signal.

5M





ANALOG COMMUNICATIONS




Unit – I

1. a) With a neat block diagram, relevant waveforms and expressions explain the generation of AM wave using square law modulator.

8M

b) When the modulation percentage is 75, an AM transmitter produces 10KW. How much of this is carrier power? What would be the percentage power saving if the carrier and one of the side bands were suppressed before transmission took place?

7M

2. a) With neat block diagram and necessary expressions explain the method of modulating the DSBSC modulated wave using balanced modulator.

7M

b) Consider a composite wave that is obtained by adding a non-coherent carrier AcCos(2∏fCt+φ) to a DSBSC wave m(t)Cos2∏fCt. The composite wave is then applied to an envelop detector. Evaluate the detector output for φ≠0, m(t)<<Ac/2.

8M

Unit – II

3. a) Explain the phase shift method of LSB (lower side band) generation, with the help of a neat block diagram and also prove mathematically.

8M

b) A certain transmitter radiates 9KW with the carrier unmodulated and 10.125KW when the carrier is sinusoidally modulated. Calculate the modulation index, if another sinewave, corresponding to 40% modulation, is transmitted simultaneously determine the total radiated power.

7M

4. a) Explain the filter method of VSB-SC modulation with the help of a block diagram and prove this mathematically.

8M

b) The single-tone modulating wave 2m mm t A Cos f t is used to generate the VSB

modulated wave 2 1 0 2m c c m m c c mS t aA A Cos f f t A A Cos f f t

where a is a constant, less than 1. Find the in-phase and quadrature components of VSB modulated wave S(t). The VSB wave S(t) plus the carrier is passed through on envelop detector. Determine the distortion produced by the quadrature component.

7M

Unit – III

5. a) Starting with basic concept of angle modulation, explain the generation of FM with neat block diagram.

8M

b) A 93.2MHz carrier is frequency modulated by a 5KHz sine wave. The resultant FM signal has a frequency deviation of 40KHz. Find the carrier swing of FM signal. When are the highest and lowest frequencies attained by the frequency modulated signal? Calculate the Modulation Index for the wave.

7M

Cont…2

:: 2 ::

6. a) Describe the generation of FM wave using Armstrong’s method. 8M b) Determine the bandwidth occupied by FM signal when carrier is modulated by a

modulating signal of 15KHz and frequency deviation is 75KHz with amplitude of modulation signal decreased by a factor 5 and frequency is increased by factor 3. What is the new Bandwidth?

7M

Unit – IV

7. a) What is PWM[Pulse width modulation.] describe the generation and demodulation of PWM signal.

8M

b) Describe the following with related equations and diagrams: i. FM threshold effect. ii. Pre and de-emphasis

7M

8. a) Derive an expression for the destination SNR of a baseband system. How is the receiver modeled for this case?

8M

b) An AM system, employing an envelope detector in the receiver, is operating at threshold. Determine the increase in transmitting power (in dB) needed if an (s/n)0 of 40dB is desired. Assume m=1 and tone modulation.

7M

Unit – V

9. a) State the problems of TRF and how it is overcome in Super heterodyne receivers. Explain with Block diagram.

8M

b) What is threshold effect in FM? How do you achieve threshold reduction in FM receiver? Explain briefly with block diagram.

7M

10. a) Prove that the figure of merit of DSB-SC receiver is equal to 1 with relevant diagram and equation.

7M

b) i. Describe the model of AM receiver showing noise effect and derive the figure of merit in terms of signal to noise ratio with block diagram

ii. Find the figure of merit when the depth of modulation is, 100%, 50%, 30%

8M




SIGNALS AND SYSTEMS (Electrical and Electronics Engineering)



Unit - I 1. a) A Continuous-time signal x(t) shown in Fig.1. Draw the signal y(t)=x(t)+x(t-2)u(t):

Fig.1

7M

b) Find the Fourier series coefficients for the signals given below: i. x1(t)=sin(2πt)+cos(3πt) ii. x2(t)=cos4t+sin8t

8M

2. a) A discrete time signal x(n) and h(n) are shown in Fig.2 and Fig.3 respectively. Sketch the following signals: i. y(n)=x(n).u(2-n) ii. z(n)=h(3n).δ(n-1)

Fig.2 Fig.3

7M

b) Find the Exponential Fourier series of the signal x(t) shown in Fig.4:

Fig.4

8M

Cont…2

::2::

Unit - II 3. a) Obtain the Fourier transform of the signal:

x(t)=e-atu(t); a>0, Draw its Magnitude and Phase spectrum. 7M

b) Find the Fourier transform of the following using appropriate properties of Fourier transform: 2sin tx t t e u t

8M

4. a) State and prove the properties of Fourier transform: i. Frequency differentiation ii. Parsavel’s theorem

8M

b) Find the Fourier transform representation for the periodic signal x(t)=cos(w0t) and draw the spectrum.

7M

Unit - III

5.

a) Find the output voltage of the RCLPF shown in Fig.5, for an input attetx )(

Fig.5

8M

b) Consider a LTI system with unit impulse response h(t)= e-t u(t), if the input applied to the system is x(t)=e-3t u (t)-u(t-2). Find the output y(t) of the system.

7M

6. a) Impulse response of the LTI system are given below, determine whether the corresponding system is (i) Memory less (ii) Causal (iii) Stable: i. h(n)=2u(n)-2u(n-2) ii. h(t)=e2tu(t-2)

7M

b) Consider a LTI system with input x(n)=2nu(n) and unit impulse response h(n)=u(n). Compute the signal y(n)=x(n)*h(n).

8M

Unit - IV 7. a) Find the Laplace transform and the associated ROC for following functions:

i. X(t)=e-atu(t) + e-btu(-t) ii. X(t)=e-tu(t)+e-4tu(t)

8M

b) Find the inverse Laplace transform of:

i. 3

1( )( 2)

X ss s

ii. 2 2 2( )( )

sX ss a

7M

8. a) By first determining x(t), verify the initial and final value theorems for each of following :

i. )2(

1)(

s

sX

ii. )3)(2(

1)(

ssssX

7M

b) The Laplace transform of a signal x(t) is given by:22

2

2)(

nn

n

wswswsX

;where nw and

are the natural frequency and damping factor respectively. For what values of , 11 , can the Fourier transform be computed from the Laplace transform.

8M

Cont…3

::3::

Unit – V 9. a) A signal tttx 2202cos1002cos)( is sampled at fs=300Hz, B=150 Hz. Assuming

ideal sampling, sketch the frequency spectrum of y(t). 7M

b) Specify the Nyquis rate and Nyquist intervals for each of the following signals: i. g1(t)=sin(200t) ii. g2(t)=sin2(200t) iii. g3(t)= sinc(200t)+sinc2(200t)

8M

10. a) Prove that the sequences: i. 1( ) ( )nx n a u n

ii. 2 ( ) ( 1)nx n a u n Have the same X(z) and differ only in ROC, Also plot their ROC’s.

7M

b) Find the inverse Z-transform for the following sequence:

i. 2 2( ) ; 13 2( 3 3 1)

zX z zz z z

ii. 22 ( 1)( ) 2( 1)

z zX zz

8M




(Regulations: VCE-R14) POWER SYSTEM GENERATION

(Electrical and Electronics Engineering) Date: 03 May, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) Discuss about base load and peak load power station. 6M b) Discuss briefly the various modes of classification of hydro -electric power plant.

9M

2. a) Discuss about different types of conventional and non-conventional sources of energy. 6M b) Calculate the average power in kW that can be generated in a hydro-electric project

from the following data: Catchment area= 5× 109m2 Annual rain fall= 1.25m Mean head= 30mt Yield factor =80% Overall efficiency of plant=70% If the load factor is 40%, what is the maximum demand?

9M

Unit – II

3. a) What are the types of steam turbine? Briefly discuss their use and characteristics. 8M b) A thermal power plant spends 25lakhs in one year as coal consumption. The coal has

heating value of 5000Kcal/Kg. and costs 500 per ton. If the thermal efficiency is 35% and electrical efficiency is 90%. Find the average load on the power plant.

7M

4. a) Describe the schematic arrangement of a thermal power station and explain the function of each briefly.

10M

b) The relation between water evaporated, coal consumption and energy generated for 8hours shift in a thermal power plant is given by M =15000+10KWh, C = 5000 + 5KWh. To what limiting value does the water evaporation per Kg of coal consumed approach as the station output increases?

5M

Unit – III

5. a) With a neat sketch explain the working of a nuclear power plant. 7M b) Briefly explain about nuclear chain reaction and reactor control.

8M

6. a) With a neat sketch explain the working of a boiling water reactor. Also mention its disadvantages over pressurized water reactor.

6M

b) Explain the methods adopted to improve the thermal efficiency of a gas power plant.

9M

Unit – IV

7. a) Define substation and explain about indoor and outdoor substation. 6M b) Explain with a neat sketch in detail about single bus bar and single bus bar with bus

sectionalizer. 9M

Cont…2

:: 2 ::

8. a) Explain about SF6 gas insulated substation mentioning its merits and demerits. 7M b) Define the following term with respect to substation:

i. Relay ii. Isolator iii. Surge arrestor iv. Main and transfer bus

8M

Unit – V

9. a) What is tariff? Briefly explain about two part tariff. 6M b) A factory has a maximum load of 240kW at 0.8p.f. lagging with an annual consumption

of 50,000 units. The tariff is Rs 50perkVA maximum demand plus 10paisa per unit. Calculate the flat rate of energy consumption. What will be annual saving if p.f. is raised to unity?

9M

10. a) Discuss about causes of low power factor and different methods of improving power factor.

9M

b) A 3 phase, 5kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in delta across the supply terminals and p.f. raised to 0.9 lagging. Determine the kVAR rating of the capacitors connected in each phase. Consider efficiency of the motor as 100%.

6M





ELECTRICAL MACHINES-II

(Electrical and Electronics Engineering)



Unit – I

1. a) Show that the stator output of a 3 phase induction motor is the rotating magnetic field. 8M b) The power input to the rotor of a 400V, 50Hz, 6 pole, 3 phase induction motor is 75KW.

The rotor electromotive force is observed to make 100 complete alterations per minute. Calculate: i. Slip ii. Rotor speed iii. Rotor copper losses per phase iv. Mechanical power developed

7M

2. a) Draw the slip-torque characteristics of the induction motor and obtain the condition for maximum torque.

8M

b) Explain the principle of operation of double cage induction motor.

7M

Unit – II

3. a) Why starter is necessary for the three phase induction motors? Explain the working of a star/delta starter.

7M

b) A 3 phase, 6 pole, 50Hz induction motor takes 60A at full load speed of 940rpm develops a torque of 150Nm. The starting current at rated voltage is 300A. What is the starting torque, If a star/delta starter is used to determine the starting torque and starting current?

8M

4. a) Explain the rotor resistance control method of speed control of induction motor. Mention the advantages of using this method.

7M

b) A 30H.P, 500V, 50Hz, 4 pole, delta connected cage motor gave the following test data: I. No load Test: 500V , 8A, 1.5kW

II. Block rotor Test: 150V, 50A , 3.5kW Draw the circle diagram and obtain the values of: i. Line current ii. PF iii. Slip at full load Assume stator and rotor resistances to be equal.

8M

Unit – III

5. a) Derive the expression for emf induced in an alternator including the effects of pitch factor and distribution factor.

7M

b) Calculate the speed and open - circuit line and phase voltages of a 4 pole, 3-phase, 50Hz, star connected alternator with 36 slots and 30 conductors per slot. The flux per pole is 0.05Wb sinusoidally distributed. Assume the coils to be full pitched.

8M

Cont…2

:: 2 ::

6. a) Explain the Potier method of finding regulation of an alternator. 7M b) A 3 phase, star connected alternator gives 575V on open circuit when field current is

10A.For the same field current, a full load current of 75A is observed on short circuit. The armature resistance between the terminals is 2.16 . On 0.8 leading pf of full load condition, induced emf per phase is 6100V. Find its rated terminal voltage per phase and between the lines. Also calculate the kVA rating of the alternator.

8M

Unit – IV

7. a) What are the advantages of connecting the alternators in parallel? What conditions are required to be fulfilled for the successful parallel operation of alternators?

8M

b) Two 50MVA, 3 phase alternators operate in parallel. The setting of the governors are such that the rise in speed from full load to no load is 2% in one machine and 3% in the other, the characteristics being straight lines in both cases. If each machine is fully loaded when the total load is 100MW, what would be the load on each machine when the total load is 60MW.

7M

8. a) Explain with neat sketches the principle of operation of a 3-phase synchronous motor. Also explain why it will not run at other than synchronous speed.

9M

b) A 2300V, 3phase, star connected synchronous motor has a resistance of 0.2 per phase and a synchronous reactance of 2.2 per phase. The motor is operating at 0.5 power factor leading with a line current of 200A. Determine the value of the generated emf per phase.

6M

Unit – V

9. a) Explain the cross field theory applied to a single phase induction motor. 6M b) Explain with neat diagrams the following types of single phase induction motors:

i. Split phase induction motor ii. Capacitor start induction motor

9M

10. a) Write short notes on: i. A.C. series motor ii. Permanent magnet motor

9M

b) A 250W, 230V, 50Hz capacitor start motor has the following constants for the main and auxiliary windings, main winding Zm=(4.5+j3.7) . Auxiliary winding Za=(9.5+j3.5) . Determine the value of the starting capacitor that will place the main and auxiliary winding currents in quadrature at starting.

6M





CONTROL SYSTEMS (Electrical and Electronics Engineering)



Unit – I

1. a) An automobile driver uses control systems to maintain the speed of a car at a prescribed level. Sketch the block diagram to illustrate this feedback control system.

7M

b) For the mechanical system shown in Fig.1, draw an electrical network based on force-voltage analogy.

Fig.1

8M

2. a) For the mechanical system shown in Fig.2, draw an electrical network based on force-voltage analogy.

Fig.2

7M

b) For the rotational system shown in Fig.3, determine the transfer function

)()(2

sTs

.

J1 = 1Kg-m2, K2 = 1Nm/rad, K1 = 1 Nm/rad, B1 = B2 = 1 Nm/rad/sec.

Fig.3

8M

Cont…2

:: 2 ::

Unit – II

3. a) Obtain the transfer function c(s)/R(s) for the system shown in Fig.4 using block diagram reduction method.

Fig.4

8M

b) Determine the gain

1

8

xx

of the system described by signal flow graph given in Fig.5.

Fig.5

7M

4. a) Using the Mason’s gain formula, obtain the overall transfer function whose signal flow graph is shown in Fig.6.

Fig.6

8M

b) Use SFG to obtain

)()(

1

2

sVsV

for the network shown in Fig.7.

Fig.7

7M

Unit - III 5. a) Obtain expressions for rise time, peak time and % peak over shoot of a 2nd order under

damped control system subjected to unit step input. 8M

b) The open loop transfer function of an unity feedback system is 15

kG ss s

if

K=225. What change must be made to reduce the peak over shoot by 50%. Without change in settling time also find the new transfer function assuming 2% tolerance.

7M

Cont…3

:: 3 ::

6. a) Determine the range of K for stability of an unity feedback control system with

1 21 1KG s

S T S T S

using R-H criteria.

6M

b) Sketch the complete root locus diagram of the system whose open loop transfer function

2 6 10KG s H s

S S S

9M

Unit – IV

7. a) Explain Nyquist stability criteria. 5M b) Draw bode plot and hence determine maximum value of K for stability for the system

with 1 0.02 1 0.2kG s H s

s s s also determine GM, PM for K=1.

10M

8.

a) For an unity feed back systems with 1 0.1 1 0.025

kG ss s s

draw bode plot

and determine maximum value of K for stability and GM for K=1.

10M

b) Draw polar plot for the system with

1 .1

G sST

5M

Unit – V

9. a) What is a PI controller? Write the transfer function and its effect on system performance.

6M

b) A linear time-invariant system is characterized by homogeneous state equation.

2

1

2

1

1101

xx

x

x . Compute the solution of the homogeneous equation assuming the

initial state vector X0 =

01

.

9M

10. a) What are the characteristics of Lead compensation? When lead compensation is employed?

6M

b) Construct a state model for a system characterized by the differential equation: 3 2

3 26 11 6 4 0.d y d y dy ydt dt dt

9M




ELECTRONIC CIRCUITS (Electrical and Electronics Engineering)



Unit – I

1. a) Briefly explain the low frequency response of an FET amplifier including the capacitive elements.

9M

b) Given IE=2.5mA,hfe=140,hoe=20us,hob=0.5us, determine: i. The Common emitter hybrid equivalent circuit ii. Represent the CE hybrid equivalent circuit parameters

6M

2. a) Draw and explain the output characteristics of a BJT in CE configuration. 5M b) DC analysis of the following source follower network results in VGSQ=-2.86V, IDQ=4.56mA,

IDSS=16mA, Vp=4V and yOS=25us. Determine: i. gm ii. rd iii. zi iv. zo with and without rd v. Av with and without rd

10M

Fig.1

Unit – II

3. a) Explain the classification of power amplifiers. 7M b) Explain the working of a class B push pull amplifier. Prove that the maximum efficiency is

78.5%.

8M

4. a) With necessary diagrams and equations deduce an expression for a class A series fed amplifier.

10M

b) Calculate the harmonic distortion components for an output signal having fundamental amplitude of 2.5V,second harmonic amplitude of 0.25V,thirdharmonic amplitude of 0.1V and fourth harmonic amplitude of 0.05V. Also calculate the total harmonic distortion.

5M

Cont…2

:: 2 ::

Unit – III

5. a) Explain the working of a RC phase shift oscillator. 7M b) For a trans conductance amplifier with series feedback has the following parameters.

RB=470Ω, Rc=2.2KΩ, RE=510Ω, β=120, re=7.5Ω. Compute gain, input impedance and output impedance with and without feedback.

8M

6. a) Mention the different feedback configurations with neat diagrams. 8M b) Deduce an expression for gain, input impedance and output impedance for voltage

shunt feedback.

7M

Unit – IV

7. a) Draw the circuit of a two level clipper circuit which is used to convert a sinusoidal signal into an approximate square wave. Draw its transfer characteristics, input and output characteristics and explain its operation.

8M

b) A high voltage generator gives a linear pulse rising for 0.05sec. remaining constant thereafter for 1sec. The rate of rise of the pulse is measured with an RC differential circuit whose time constant is 150Psec. if the positive output voltage from the differentiate has a maximum values 15V, determine the peak voltage of the generator.

7M

8. a) Draw a high pass circuit, derive response for a ramp input of this circuit and show input and output characteristics.

7M

b) Draw the transfer characteristics and output waveform for the two level clipper shown in Fig.2. Assume ideal diodes. The input is a sinusoidal signal of 40V peak value.

Fig.2

8M

Unit – V

9. a) Explain the working of a self-biased Bistable multivibrator. 7M b) Explain the working of a Schmitt trigger with a circuit diagram and necessary waveforms.

8M

10. a) With the help of circuit and waveforms, explain the working of emitter coupled astable multivibrator.

7M

b) Design a collector coupled one shot multivibrator circuit using NPN transistor. Neglect ICBO and junction voltages of the transistor in saturation. Assume hfe(min) = 20. The stable state of the transistor has VBE = -1. The on transistor has base current IB which is 50% in excess of the IB(min) value. VCC = 8V, IC(sat) = 2mA, Delay time = 2500sec. Choose R1 = R2.

8M





ELECTRICAL TECHNOLOGY

(Mechanical Engineering)



Unit – I

1. a) A wheat stone network has the following resistances: AB=10Ω, BC=15Ω, CD=25Ω, DA=20Ω, and BD=10Ω. A cell of 2V with negligible internal resistance is connected across AC, calculate the current in the branch BD.

8M

b) Obtain the potential difference Vxy in the circuit of.

Fig.1

7M

2. a) Define KVL and KCL with an example. 7M b) Determine the current in 4Ω branch in the circuit shown in Fig.2

Fig.2

8M

Unit – II

3. a) Determine the current I in the circuit shown in Fig. 3 and verify the result using reciprocity theorem.

Fig.3

8M

b) Using Millman’s theorem determine the source current and current in 10Ω resistance in the circuit shown in Fig. 4.

Fig.4

7M

Cont…2

:: 2 ::

4. a) State Tellegen’s theorem. 5M b) Using Thevenin’s theorem determine the current in the galvanometer resistance of 10Ω

in a Kelvin’s double bridge shown in Fig. 5.

Fig.5

10M

Unit – III

5. a) State and explain Faraday’s laws of electromagnetic induction and self - induced emf. 8M b) Derive the EMF equation of a D.C. Generator.

7M

6. a) Explain the swinburn’s test and derive the efficiency equation for generator. 8M b) Explain back emf and derive the torque equation of a D.C. motor.

7M

Unit – IV

7. a) Derive the EMF equation of a transformer. 5M b) A 250 KVA, 11000/415V, 50Hz single phase transformer has 80 turns in the secondary,

calculate: i. The rated primary and secondary currents ii. The number of primary turns iii. The maximum value of flux iv. Voltage induced per turn

10M

8. a) A 4 kVA, 400/200V, 50 Hz, single phase transformer gave the following results: No-load test : 200V, 0.7A, 60W (lv side) Short-circuit test: 15V, 10A, 61W (hv side). Calculate: i. Components of no-load current ii. Efficiency on full-load at 0.8pf lagging iii. Regulation at full load at 0.8pf lagging

10M

b) Explain different losses available in transformer and then explain how to minimize the losses.

5M

Unit – V

9. a) Explain the principle of operation of a three phase induction motor. 6M b) Draw slip-torque curve of an induction motor and obtain the relationship between, slip,

rotor input and rotor copper loss.

9M

10. a) Explain the starting methods of 3 phase induction motor and explain any one method. 7M b) The power input to the rotor of a 440V, 50Hz, 6 pole 3 phase induction motor is 100KW.

The rotor electromotive force is observed to make 120 cycles per minute. Calculate i. Slip ii. Rotor speed iii. Mechanical power developed iv. The rotor copper loss per phase v. Speed of stator field with respect to rotor

8M





THERMAL ENGINEERING-I (Mechanical Engineering)



Unit - I 1. a) State the functions of the following in an IC engine:

i. Valve spring ii. Fins iii. Piston Rings iv. Connecting rod v. Piston vi. Crank shaft vii. Cam Shaft viii. Engine Bearings

8M

b) Draw a typical Valve time diagram of a 4 stroke engine. What is valve overlapping and what is its necessity?

7M

2. a) With the help of P-V diagrams distinguish the Theoretical and Actual diesel cycle. 8M b) With the help of a P-V diagram show how blowdown loss is affected by exhaust valve

opening.

7M

Unit - II 3. a) With the help of P-θ diagram explain the different stages of SI engine combustion. 8M b) What is the effect of the following engine variables on SI engine Ignition lag:

i. Self Ignition temperature of the fuel, ii. Mixture strength, iii. Initial temperature and iv. Turbulence

7M

4. a) How do the following variables affect the Delay period in CI engines: i. Intake Temperature ii. Intake pressure iii. Speed iv. A/F ratio

8M

b) With sketches show how Swirl and Squish are induced in the CI engine combustion chamber.

7M

Unit - III 5. a) Define the following terms:

i. Indicated Power ii. Brake Power iii. Mechanical Efficiency iv. Brake mean effective pressure v. Volumetric efficiency

10M

b) The following observations have been made from the test of a four-cylinder, two-stroke gasoline engine. Diameter=10 cm, Stroke=15cm, Speed=1600rpm, Area of the positive loop of indicator diagram=5.75 cm2, Area of the negative loop of indicator diagram=0.25 cm2, Length of indicator diagram=55mm, Spring constant=3.5bar/cm, find the indicated power of the engine.

5M

Cont…2

::2::

6. a) Schematically explain the use of the study of the heat balance of an engine. 5M b) The following data were recorded during a test on single-cylinder four-stroke oil engine.

Bore=150mm, Stroke=300mm, Speed=18000rph (revolutions per hour), Brake Torque=200N-m, indicated mean effective pressure=7 bar, fuel consumption=204kg/hr, cooling water flow rate=5kg/min, cooling water temperature rise=300C. Air-fuel ratio=22, exhaust gas temperature=4100C, Specific heat of exhaust gases=1kJ/kgK, Room temperature=200C, calorific value of fuel=42MJ/kg. Determine: i. Mechanical efficiency ii. BSFC iii. Draw heat balance sheet on minute basis and percent basis

10M

Unit - IV 7. a) Derive the expression for work done on a Single stage Compressor without clearance. 7M b) Define the following:

i. Volumetric efficiency ii. Clearance ratio of a compressor and derive the expression for volumetric efficiency

in terms of clearance ratio and pressure ratio

8M

8. a) A single stage reciprocating air compressor takes 1m3 of air/minute at 1.013bar and 150C and delivers it at 7bar. Assuming that the law of compression is pV1.35=const and with no clearance calculate the indicated power.

7M

b) A single stage double acting air compressor is required to deliver 14m3 of air/minute measured at 1.013bar and 150C. The delivery pressure is 7bar and the speed 300rpm. The clearance is 5% of the swept volume with the compression and expansion index n=1.3. Calculate: i. Swept volume of the cylinder ii. Delivery Temperature iii. Indicated power

8M

Unit - V 9. a) With a neat sketch analyze the variation of pressure and velocity of air passing through

the impeller and the diffuser of a centrifugal compressor. 7M

b) Compare the Axial Flow and Centrifugal Flow compressors.

8M

10. a) Compare the work inputs required for a Roots blower and a Vane type compressor having the same induced volume of 0.03m3/rev, the inlet pressure being 1.013bar and the pressure ratio 1.5 to 1. For the vane type assume that internal compression takes place through half the pressure range.

7M

b) An axial flow compressor having 8 stages and with 50% reaction design compresses air in the pressure ratio of 4:1. The air enters the compressor at 200C and flows through it with a constant velocity of 90m/s. The mean speed of rotating blades of the compressor is 180 m/s. Isentropic efficiency of the compressor may be taken as 82%. Calculate: i. Work done by the machine ii. Blade Angles

8M





MANUFACTURING TECHNOLOGY-I (Mechanical Engineering)



Unit – I 1. a) What is manufacturing process? Explain the steps involved in a casting process. 10M b) List the advantages of casting process.

5M

2. a) What is a pattern? Explain the various pattern allowances. 10M b) Explain solidification in pure metals and alloys.

5M

Unit – II 3. a) With a neat sketch explain transferred and non transferred arc of plasma arc welding

process. 8M

b) Mention the classification of welding process.

7M

4. a) Mention the principle of resistance welding, list its types and explain any one. 8M b) With a sketch explain the features of different types of flames in gas welding.

7M

Unit - III 5. a) With a neat sketch explain about friction welding and mention its advantages,

disadvantages and application. 10M

b) List the types of destructive and non destructive test done for checking the quality of welds.

5M

6. a) With a neat sketch explain the welding process used for joining micro components with advantages and disadvantages.

9M

b) Differentiate between soldering and welding.

6M

Unit - IV 7. a) Distinguish between hot and cold working process. 6M b) Explain with sketch any 3 types of rolling mill.

9M

8. a) Explain the various defects that occur in forging process. 6M b) Explain the following with sketch:

i. Blanking ii. Punching iii. Coining

9M

Unit – V 9. a) Differentiate between Direct and Indirect methods of extrusion with sketches. 8M b) With neat sketch, explain Hydrostatic Extrusion process.

7M

10. a) Explain the process of injection molding with a neat sketch. 9M b) Explain the properties of thermoplastics and their application. 6M





HYDRAULIC MACHINERY AND SYSTEMS

(Mechanical Engineering)



Unit – I

1. a) State and explain the Impulse momentum principle. 5M b) A Jet of water of diameter 7.5cm strikes a curved plate at its centre with a velocity of

20m/s, which is moving with a velocity of 8m/s in the direction of the jet. The Jet is deflected through an angle of 165˚. Assuming the plate as smooth, find: i. The force exerted by the Jet on the plate ii. The power of the Jet iii. The efficiency of the Jet

10M

2. a) Prove that the force exerted by the Jet of water on a fixed semicircular plate in the direction of the jet when the jet strikes at the centre of a semicircular plate is two times the force exerted by the Jet on a fixed vertical plate.

7M

b) A Jet of water of diameter 50mm, having a velocity of 20m/s strikes a curved vane, which is moving with a velocity of 10m/s in the direction of jet. The Jet leaves the vane at an angle of 60˚ to the direction of motion of vanes at outlet. Determine the following: i. The force exerted by the Jet on the vane in the direction of motion ii. The work done by the Jet per sec

8M

Unit – II

3. a) Discuss the suitability of hydraulic turbines based on available head. 6M b) A pelton wheel is supplied with a75mm diameter jet having a velocity of 100m/s. The

buckets deflect the jet by 170o when stationery. The ratio of their vane speed to jet speed is 0.47. Neglecting losses find: i. Wheel diameter ii. Power developed iii. Kinetic energy head of the jet leaving the pelton wheel. Take speed of the turbine

as 600rpm

9M

4. a) With the help of sketches explain briefly any four types of draft tubes. 5M b) Determine the absolute pressure head at the inlet of a vertical divergent draft tube from

the following data. Total length of draft tube is 5.75m, length of draft tube 1.25m, head loss due to friction is 0.25 X kinetic head at outlet velocity, velocity of water at inlet is 5m/s. Tube inlet diameter is 0.6m, outer diam of tube is 0.9m. Find the efficiency of draft tube.

10M

Unit – III

5. a) Define unit speed, unit power and unit discharge with respect to turbines and write their corresponding mathematical expressions.

9M

b) A pelton wheel turbine is to operate under a head of 400m at 400rpm. If a single jet of 150mm diameter is used. Find the specific speed of this turbine. The following data may be used. Cv=0.98, v=0.45 , overall efficiency as 85%. Find also pitch circle diameter.

6M

:: 2 ::

6. a) What is the effect of acceleration in suction pipe on the pressure head in the cylinder of

a reciprocating pump? 8M

b) A single acting reciprocating pump has a plunger of diameter 125mm and a stroke of 300mm. The length of the suction pipe is 9m and the diameter is 75mm. Find the acceleration pressure head at the beginning of the suction stroke when the pump is running at 30rpm. If the axis of the pump is 3m above the sump level. Find the absolute pressure head in the cylinder at the beginning stroke. Take atmospheric head as 10.3m of water.

7M

Unit – IV

7. a) What is meant by manometric efficiency, mechanical efficiency and overall efficiency of a centrifugal pump?

6M

b) A centrifugal pump is running at 1000 rpm. The outlet vane angle of the impeller is 45˚ and velocity of flow at outlet is 2.5m/s. The pump is working against a total head of 20m and discharge through the pump is 0.2cumecs. If the manometric efficiency of the pump is 80%, determine the diameter of the impeller and width of impeller at outlet.

9M

8. a) Draw and discuss the operating characteristics curves of a centrifugal pump. 6M b) Two geometrically similar pumps are running at the same speed of 1000rpm. One pump

has an impeller diameter of 0.3m and lifts water at the rate of 20litres per sec, against a head of 15m. Determine the head and impeller diameter of the other pump to deliver half of the discharge.

9M

Unit – V

9. a) Derive an expression for power transmission through pipes. What is the condition for maximum transmission of power and corresponding efficiency of transmission?

6M

b) A Pipe of diameter 300mm and length 3500m is used for transmission of power by water. The total head at the inlet of the pipe is 500m. Find the maximum power available at the outlet of the pipe, if the value of f is 0.006.

9M

10. a) Derive an expression for the propelling force and the work done per sec on a tank which is provided with an orifice through which a jet of water is coming out and tank is free to move?

6M

b) The water in a Jet propelled boat is drawn amid-ship and discharged at the back with an absolute velocity of 20m/s. The cross sectional area of the jet at the back is 0.02m2 and the boat is moving in sea water with a speed of 30Km/h. Determine the: i. Propelling force on the boat ii. The power required to drive the pump iii. The efficiency of Jet propulsion

9M





KINEMATICS OF MACHINERY (Mechanical Engineering)



Unit – I

1. a) What are quick return mechanisms? Where they are used? Sketch and explain the functioning of Whitworth’s quick return mechanism.

10M

b) Sketch the following: i. Spherical pair ii. Sliding pair

5M

2. a) With the help of neat diagrams explain any two inversions of single slider crank mechanism.

8M

b) Explain crank and slotted lever quick return mechanism with a neat sketch.

7M

Unit – II

3. a) Explain the mechanism of Pantograph with a neat diagram. 7M b) Prove that the Peaucellier mechanism can be used to draw exact straight line motion.

8M

4. a) Write a short note on Grasshopper mechanism. 7M b) Explain briefly Scott Russel’s mechanism with suitable diagram.

8M

Unit – III

5. For the configuration of the crank and slotted lever mechanism shown in Fig.1 below find the velocity and acceleration of tool S and the angular velocity and angular acceleration of link RS. The crank OP rotates at 210 rpm.

Fig.1

15M

6. a) Explain with neat sketch Ackerman steering gear mechanism. 7M b) In a pin jointed four bar mechanism ABCD, link AB = 300 mm, BC = CD=360 mm, and the

fixed link AD = 600 mm. Link AB makes an angle of 60° with the link AD. Locate all the instantaneous centers.

8M

Unit – IV

7. Design a cam for operating the exhaust valve of an oil engine. It is required to give equal uniform acceleration and retardation during opening and closing of the valve each of which corresponds to 60° of cam rotation. The valve must remain in the fully open position for 20° of cam rotation. The lift of the valve is 37.5mm and the least radius of the cam is 40mm. The

15M

follower is provided with a roller of radius 20mm and its line of stroke passes through the axis of the cam.

Cont…2

::2:: 8. a) A shaft runs at 80rpm and drives another shaft at 150rpm through belt drive. Diameter

of the driving pulley is 600mm. Determine the diameter of the driven pulley in the following cases: i. Neglecting the belt thickness ii. Taking belt thickness as 5 mm iii. Assuming for case iv. a total slip of 4% v. Assuming for case vi. a slip of 2% on each pulley

8M

b) The driving pulley of an open belt drive is of 800mm diameter and rotates at 320rpm while transmitting the power to a driven pulley of 250mm diameter. The Young’s modulus of elasticity of the belt material is 110N/mm2. Determine the speed lost by the driven pulley due to creep if the stresses in the tight and slack side of the belt are found to be 0.8N/mm2 and 0.32N/mm2.

7M

Unit – V

9. a) State and prove law of gearing. 7M b) Two 20 degree involute spur gears mesh externally and give a velocity ratio of 3. The

module is 3mm and the addendum is equal to 1.1module. If the pinion rotates at 120rpm, determine the: i. Minimum number of teeth on each wheel to avoid interference ii. Contact ratio

8M

10. An epicyclical gear train shown in Fig.2, is composed of fixed annular wheel ‘A’ having 150 teeth. The wheel ‘A’ is meshing with wheel ‘B’ which drives wheel ‘D’ through an ideal wheel ‘C’. ‘D’ being concentric with ‘A’, the wheels ‘B’ and ‘C’ are carried on an arm which revolves clockwise at 100 rpm about the axis of ‘A’ and ‘D’. If the wheels ‘B’ and ‘D’ have 25 teeth and 40 teeth respectively, find the number of teeth on ‘C’ and the speed and sense of rotation of ‘C’.

Fig.2

15M




(Regulations: VCE-R14) CONCRETE TECHNOLOGY

(Civil Engineering) Date: 21 April, 2016 FN Time: 3 hours Max Marks: 75

Answer ONE question from each Unit All Questions carry Equal Marks

Unit – I

1. a) Distinguish between Dry process and Wet process with regard to manufacture of cement.

7M

b) What are the chemical compounds of cement? Discuss briefly the role of these compounds on the development of strength.

8M

2. a) Discuss Alkali-Aggregate reaction and Bulking of fine aggregate. 7M b) Discuss the two opposing effects on strength that are caused by increasing the

maximum size of the aggregate in a concrete mixture.

8M

Unit – II

3. a) What are chemical admixtures? Discuss the mechanism of action of superplasticizer with the help of a neat sketch.

8M

b) What do you understand by workability of concrete? Explain the factors which affect the workability.

7M

4. a) Explain the role of mineral admixtures on the properties of concrete. 8M b) List the tests conducted to measure the workability of concrete. Explain the merits of

each test.

7M

Unit – III

5. a) Explain the term Non-destructive testing of concrete. Discuss Rebound hammer and Ultra sonic pulse velocity test methods.

8M

b) Write a note on the relationship between compressive strength and tensile strength of concrete.

7M

6. Define creep and shrinkage of concrete. Mention the different types of shrinkage of concrete. Explain the factors affecting the shrinkage of concrete.

15M

Unit – IV

7. Design a mix for structure located in coastal region for following data: Grade of Concrete: M30 Specific Gravity: Cement-OPC 43 grade-Specific Gravity – 3.15 Natural River Sand – 2.65 Coarse Aggregate – 2.7 Type of aggregate: angular, nominal size – 20mm W/C ratio: 0.38 use SP with specific gravity 1.08 Slump required: 75mm Minimum cement content: 340kg/m3 Water Absorption: CA=0.5% Fine Aggregate=1.5% Sand confirm to Zone-II

15M

Cont…2

:: 2 ::

8. a) Explain the significance of mix design. List the factors influencing the choice of mix design.

7M

b) Explain the significance of durability of concrete. Explain the factors which affect the durability.

8M

Unit – V

9. a) List out the different tests available for finding the fresh properties of SCC based on EFNARC and ASTM guidelines with their acceptable values.

8M

b) List the applications of High Density Concrete.

7M

10. a) Explain the orientation, distribution and failure of fibers in FRC. 8M b) What is high performance concrete? Explain the properties. 7M





STRENGTH OF MATERIALS-II

(Civil Engineering)

Date: 26 April, 2016 FN Time: 3 hours Max Marks: 75 Answer ONE question from each Unit


Unit – I

1. a) What do you understand buy the theories of failure? Explain principal stress theory. 7M b) A bolt is subjected to an axial pull of 12kN together with a transverse shear force of

6kN. Determine the diameter of bolt using maximum principal stress theory.

8M

2. At a point in strained material there is a tensile stress of 80N/mm2 upon a horizontal plane and a compressive stress of 40N/mm2 upon a vertical plane. There is also a shear stress of 40N/mm2 upon each of these planes. Determine the maximum stresses at the point. Determine also the resultant stresses on the plane and sketch the resultant stresses.

15M

Unit – II

3. a) Using Euler’s theory derive an equation for the crippling load for long column both ends fixed.

10M

b) Calculate the critical load Pcr for a 8 X35 steel column (see Fig.1) having length L =24m and E =30 X106 Mpa under the following conditions: i. The column buckles by bending about its strong axis (axis 1-1) ii. The column buckles by bending about its weak axis (axis 2-2) iii. In both cases, assume that the column has pinned ends

Fig.1

5M

4. A steel bar has a square cross section of width b = 2.0m. (see Fig2). The bar has pinned supports at the ends and is 3.0m long. The axial forces acting at the end of the bar have a resultant P =20kN located at distance e =0.75m. from the center of the cross section. Also, the modulus of elasticity of the steel is 29,000Mpa. i. Determine the maximum compressive stress in the bar ii. If the allowable stress in the steel is 18,000Mpa, what is the maximum permissible

length of the bar?

Fig.2

15M

Cont…2

:: 2 ::

Unit – III

5. a) Derive the torsion equation for circular shafts. 7M b) A solid shaft transmits 250kN at 100rpm. If the shear stress is not to exceed 75N/mm2,

what should be the diameter of the shaft. If this shaft is to be replaced by a hollow one whose internal diameter =0.6 times the outer diameter, determine the size of shaft.

8M

6. a) A railway wagon weighing 65kN and moving with a speed of 18kmph has to be stopped any four buffer springs. The maximum compression allowed in each spring is 200mm. Calculate the no. of turns required in each spring if the diameter of the wire of the spring is 20mm.The mean diameter of each coil is 200mm. C=0.84x105 N/mm2.

8M

b) An open coiled helical spring is subjected to an axial load of 50kN.Determine the deflection of the spring and maximum shear stress in the spring wire where number of coils =4, mean radius of coil =30mm, diameter of spring wire =5mm.C=80000MPa, angle of helix=10o , E=1x105N/mm2.

7M

Unit – IV

7. a) List the stability requirements of masonry dams. 5M b) A concrete dam of trapezoidal section having water in its vertical face is 16meters

heigh.Thebase of dam is 8m wide and top is 3m wide. Find: i. Resultant thrust per meter length of dam ii. Intensities of maximum and minimum stress across the base. Weight of

concrete=24kN/m3.Water level coincides with top of dam

10M

8. A masonry retaining wall of trapezoidal section is 6m high and retains earth which is level upto the top. The width at the top is 1m and exposed face is vertical. Find the minimum width of the wall at the bottom in order the tension may not be induced at the base. The density of masonry and earth is 2300 and 1600kN/m3 respectively. The angle of repose of the soil is 30°.

15M

Unit – V

9. Determine the magnitude and the nature of forces in the members of the truss shown in Fig.3. Use method of sections.

Fig.3

15M

10. Evaluate the forces in the members of the truss shown in Fig.4, by the method of joints and indicate their nature.

Fig.4

15M





STRUCTURAL ANALYSIS-I (Civil Engineering)



Unit – I

1. Analyse the propped cantilever loaded as shown in Fig.1. Draw BMD and SFD. Assume constant EI throughout the span.

Fig.1

15M

2. Determine the deflection at quarter span points for the prop as shown in Fig 2.

Fig.2

15M

Unit – II

3. Analyse a fixed beam of span ‘L’ with an eccentric point load ‘P’ for fixed end moments. Draw SFD and BMD.

Fig.3

15M

4. Analyse the given continuous beam using three moment theorem. Draw SFD and BMD.

Fig.4

15M

Unit – III

5. A train of wheel loads as shown in Fig.5. crosses a simply supported beam of span 24 m from left to right. Calculate the maximum negative shear and maximum positive shear force values at the centre of the span and also the absolute maximum bending moment anywhere in the span.

Fig.5

15M

Cont…2

:: 2 ::

6. Two wheel loads of 160kN and 400kN spaced 2m a part move on a simply supported beam

girder of span 16m as shown in Fig.6. Find the maximum positive and negative shear force at a section: i. 4m from the left end ii. 6m from the left end

Fig.6

15M

Unit – IV

7. Determine the vertical and horizontal deflection at point E in the frame shown in the Fig.7. Assume EI constant throughout.

Fig.7

15M

8. Analyse the two span continuous beam shown in Fig.8. by slope deflection method and draw BMD and SFD and elastic curve.

Fig.8

15M

Unit – V

9. Determine the horizontal displacement at B for the truss loaded as shown in Fig.9. The area of cross section of each member is given in adjoining circle in mm2. E=200GPa.

Fig.9

15M

10. Find the degree of static indeterminacy for the structures as shown in Fig.10.

Fig.10

15M





HYDRAULICS AND HYDRAULIC MACHINES (Civil Engineering)



Unit – I

1. a) State Buckingham’s -theorem. What do you mean by repeating variables? How are the repeating variables selected in dimensional analysis?

7M

b) Find an expression for the drag force on smooth sphere of diameter D, moving with a uniform velocity V in a fluid of density ρ and dynamic viscosity μ.

8M

2. a) Define the following non-dimensional numbers: i. Reynold’s Number ii. Froude’s Number iii. Mach Number iv. Euler’s Number

8M

b) A pipe of diameter 1.5m is required to transport an oil of sp. gr. 0.90 and viscosity 3 x 10-2

poise at the rate of 3000litre/s. Tests were conducted on a 15cm diameter pipe using water at 200C. Find the velocity and rate of flow in the model. Viscosity of water at 200C is 0.01poise.

7M

Unit – II

3. a) Prove that the force exerted by a jet of water on a fixed semi-circular plate in the direction of the jet when the jet strikes at the centre of the semi-circular plate is two times the force exerted by the jet on a fixed vertical plate.

10M

b) A jet of water of diameter 50mm moving with a velocity of 40m/sec, strikes a curved fixed symmetrical plate at the centre. Find the force exerted by the jet of water in the direction of the jet, if the jet is deflected through an angle of 120o at the outlet of the curved plate.

5M

4. a) Derive an expression for the force exerted by a jet of water on moving inclined plate in the direction of jet.

7M

b) A jet of water having a velocity of 45m/s impinges without shock a series of vanes moving at 15m/s, the direction of motion of the vanes being inclined at 20o to that of the jet. The relative velocity at outlet is 0.9 of that at inlet and the absolute velocity of water at exit is to be normal to motion of the vanes. Find: i. Vane angles at entrance and exit ii. Work done on vanes per unit weight of water supplied by the jet

8M

Unit – III

5. a) Define the term most economical section of a channel. What are the conditions for the rectangular channel of the best section?

8M

b) A rectangular channel carries water at the rate of 400litres/s when bed slope is 1 in 2000. Find the most economical dimensions of the channel if C = 50.

7M

Cont…2

:: 2 ::

6. a) Explain the following terms: i. Specific energy of a flowing liquid ii. Minimum specific energy iii. Critical depth iv. Critical velocity

8M

b) A rectangular channel 2m wide carries a discharge of 6m3/s. Calculate the critical depth, critical velocity and specific energy at critical depth.

7M

Unit – IV

7. a) Obtain an expression for work done per second by water on the runner of a Pelton wheel. Hence derive the expression for maximum efficiency.

8M

b) A Kaplan turbine produces 60,000kW under a net head of 25m with an overall efficiency of 90%. Taking the value of speed ratio as 1.6 and flow ratio as 0.5. Assume hub diameter as 0.35 times the outer diameter. Find the diameter and speed of the turbine.

7M

8. a) Explain different characteristic curves of a hydraulic turbine. 8M b) The quantity of water available for a hydroelectric station is 275m3/s, under a head of

18m. Assuming the speed of the turbine to be 150rpm, and their efficiency 82%, determine the number of turbines required if: i. Francis turbine whose specific speed must not exceed 395rpm ii. Kaplan turbine whose specific speed must not exceed 690rpm

7M

Unit – V

9. a) Define suction head, delivery head, static head and manometric head in a centrifugal pump.

8M

b) The diameters of an impeller of a centrifugal pump at inlet and outlet are 30cm and 60cm respectively. The velocity of flow at outlet is 2.0m/s and the vanes are set back at an angle of 45o at the outlet. Determine the minimum starting speed of the pump, if the manometric efficiency is 70%.

7M

10. a) Explain various efficiencies applicable to single stage centrifugal pumps. 8M b) The internal and external diameters of the impeller of a centrifugal pump are 200mm

and 400mm respectively. The pump is running at 1200rpm. The vane angles of the impeller at inlet and outlet are 20o and 30o respectively. The water enters the impeller radially and velocity of flow is constant. Determine the work done by the impeller per unit weight of water.

7M





BUILDING PLANNING AND DRAWING (Civil Engineering)



Unit – I

1. a) Explain the needs of lighting and ventilation requirements for a building. 7M b) Explain plinth area, floor area and carpet area with examples.

8M

2. a) Write a brief note on classification of buildings. 7M b) How do you justify the open area requirements for a building? Explain briefly.

8M

Unit – II

3. Develop a line diagram to a suitable scale for a bank building with the following requirements: i. Manager’s cabin with attached toilet ii. Banking hall iii. Cash counter iv. Waiting hall, entrance lobby v. Strong room vi. Toilet block

15M

4. Prepare a line diagram for a canteen with the following requirements(capacity 100) i. Kitchen with store ii. Entrance lobby with cash counter iii. Dining area iv. Service counters v. Toilet block vi. Wash area vii. Utility

15M

Unit – III

5. a) Draw a neat sketch and explain one and a half brick thick wall in English bond. 8M b) Draw the sign conventions of the following:

i. Brick ii. Stone iii. Concrete iv. Glass v. Timber vi. Sand filling vii. Cinders

7M

6. With a neat sketch explain plan and view of odd and even courses of one and a half brick thick wall in Flemish bond.

15M

Cont…2

:: 2 ::

Unit – IV

7. Draw any two of the following sketches with dimensions: i. Framed and panelled door ii. Glazed window iii. King post truss

15M

8. Draw any two of the following sketches with dimensions: i. Queen post truss ii. Couple roof or collar roof iii. Steel window

15M

Unit – V

9. For the given line diagram of a residential building Fig.1, arrange doors, windows, ventilators and open spaces at required places and draw the plan and elevation along A-B. Assume suitable dimensions for foundation, doors and windows etc.

Fig.1

15M

10. Draw plan and section for the given line diagram of a residential building Fig.2, arrange doors, windows, ventilators and open spaces at required places and assume suitable dimensions for foundations, doors and windows etc.

Fig.2

15M




(Regulations: VCE-R14) SURVEYING-II

(Civil Engineering) Date: 03 May, 2016 Time: 3 hours Max Marks: 75


Unit – I

1. a) Derive the formula for calculation of area by Simpson’s rule. What are its limitations? 7M b) The contour plan of a proposed reservoir provides the following data, determine the

capacity of the reservoir if the full reservoir level is 125.00mts, both by prismoidal and trapezoidal rules.

Contour.(mts.) 100 105 110 115 120 125 Area.(Hectare) 3 8 10 15 20 25

8M

2. a) Draw the sketch of a leveled trapezoidal section in cutting and embankment and derive expression for the area.

7M

b) The following perpendicular offsets were taken from a chain line to an irregular boundary, compute the area between chain line, the boundary and end offsets.

Chainage.(mts.) 0 8 20 35 47 60 offsets.(mts.) 14.5 24.5 30.8 27.4 28.4 18.4

8M

Unit – II

3. a) Explain the fundamental axis of the theodolite with a neat sketch and mention the conditions between fundamental axis.

7M

b) How do you determine the height of a chimney if the base of the chimney is accessible?

8M

4. a) How would you measure a horizontal angle by repetition method? What are its advantages?

9M

b) The top of a hill subtends an angle 9⁰30’ at a point A. The same point on the top of the hill subtends an angle of 12⁰30’ at a point B which is in line with point A and the point on the top of the hill. Distance AB was found to be 1600m, determine the elevation of the top of the hill and its distance from point A, given elevation of point A is 430.650m.

6M

Unit – III

5. a) Explain anallatic lens. What are its advantages? 7M b) A leveling staff is held vertical at distances of 100m and 300m from the axis of a

tachometer and the staff intercept for horizontal sights are 0.99m and 3.00m respectively. Find the constants of the instrument.

8M

6. a) Derive the distance and elevation formula for the line of sight horizontal and staff held vertical.

7M

b) A tacheometer is setup at an intermediate point on a traverse course PQ and the following observations are made on a vertically held staff.

Staff station Vertical angle Staff intercept Axial hair reading. P 8° 36’ 2.350 2.105 Q 6° 6’ 2.055 1.895

The instrument is fitted with an anallatic lens and the constant is 100. Compute the length of PQ and reduced level of Q, that of P being 321.50metrs.

8M

Cont…2

:: 2 ::

Unit – IV

7. a) Explain the basic features of total station. 8M b) Define Geographic Information System (GIS). Mention the basic objectives of GIS.

7M

8. a) Compare the features of a total station with conventional survey instruments. 7M b) Explain the principle of Global Positioning System.

8M

Unit – V

9. a) Draw a neat diagram of compound circular curve and label the components. 7M b) Determine the chainages of PC, PCC and PT of a right hand compound curve, given the

following data: Total deflection angle = 800

Radius of 1st arc = 200m Radius of 2nd arc = 250m Chainage of point of intersection = 1504.8m Deflection angle of 1st arc = 500

8M

10. a) Draw a neat diagram of simple curve and label the components. 7M b) Calculate the necessary data for setting out a simple curve of radius 250m to connect two

tangents by methods of offsets from chord produced, if the deflection angle is 46030’, chord length of 20mts, chainage of intersection point being 2032.0m.

8M




(Regulations: VCE-R11A)

ELECTRONIC CIRCUIT ANALYSIS (Electronics and Communication Engineering)



Unit – I

1. a) A CE transistor amplifier is driven by a voltage source VS of internal resistance RS=1200Ω. The load impedance is a resistor RL=1200Ω. The h parameters of the transistor are hie=1100Ω, hfe=51, hre=2.5x10-4 and hoe=25x10-6 A/V. Calculate: i. Ai ii. Zi iii. Av iv. AIS v. AVS vi. Z0

9M

b) Calculate the following for the circuit in Fig.1with rd=100KΩ and gm=3000μs: i. Input impedance ii. Output impedance iii. Voltage gain

Fig.1

6M

2. a) Sketch the circuit of common source JFET amplifier. Derive the expression for the voltage gain using low frequency small signal model of JFET.

9M

b) The circuit shown in Fig.2, calculate: i. Ap ii. Zi and iii. Z0. The h parameters of the transistor are given as, hie=3KΩ, hfe=100, hre=6.5x10-4, hoe=30μA/V:

Fig.2

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Cont…2

::2::

Unit – II

3. a) What are the two conditions to be satisfied for sustained oscillations? How they are satisfied in an RC phase shift oscillator?

6M

b) An amplifiers total harmonic distortion is reduced from 8% and 2%. When 5% negative feedback is used: i. What was the initial voltage gain of the amplifier when distortion was 8% ii. What was the gain with 2% distortion iii. How much distortion would be there if the gain with feedback were reduced to 10

9M

4. a) Derive expressions for Rif and R0f of voltage-series feedback amplifier. 8M b) With a neat circuit diagram, explain the working of a Wien bridge oscillator.

7M

UNIT – III

5. a) Explain the type of distortions in an amplifier. 6M b) Draw the circuit of two stage RC-coupled amplifier using BJT, give the voltage gain of

each stage and calculate voltage gain, output voltage, input impedence and output impedence for the following values of R1=15kΩ, R2=4.7kΩ, RE=1kΩ, RC=2.2kΩ, IE=4mA and Vin=25µv.

9M

6. a) Derive the following expressions for Darlington-emitter follower circuit: Zi, Zo and Av. 9M b) Derive the expression for CE- short circuit current gain Ai as a function of frequency.

6M

UNIT – IV

7. a) Explain why even harmonics are not present in a push-pull amplifier and give additional advantages of push-pull over that of a single transistor amplifier.

9M

b) Show that the maximum conversion efficiency of the idealized class B push-pull circuit is 78.5%.

6M

8. a) Define conversion efficiency of a power stage, derive an expression for it and compare the maximum efficiency of a series and transformer coupled class A single transistor power stage.

8M

b) Derive an expression for the output power of a class A large signal amplifier in terms of Vmax, Vmin, Imax and Imin and also explain its working.

7M

UNIT – V

9. a) Discuss the circuit operation of double tuned amplifier. It is required to obtain a bandwidth of 200KHz at an operating frequency of 10MHz using a double tuned circuit. What value of Co-efficient of coupling should be used?

8M

b) A single tuned transistor amplifier is used to amplify modulated RF carrier of 600KHz and bandwidth of 15KHz. The circuit has a total output resistance Rt=20KΩ and output capacitance Co=50PF. Calculate value of inductance and capacitance of the tuned circuit.

7M

10. a) What are tuned amplifiers, explain the following aspects in context to tuned amplifiers: i. Frequency response ii. Q-factor iii. Requirement of tuned amplifiers

8M

b) Draw the circuit for single tuned capacitive coupled amplifier, explain its operation, draw its equivalent circuit and derive an expression for its centre frequency.

7M

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VARDHAMAN COLLEGE OF ENGINEERING · (Regulations: VCE-R14) ENVIRONMENTAL SCIENCE (Common to...

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