B.Tech. DEGREE EXAMINATION, MAY - 2013 … · · 2014-02-03(Examination at the end of Third Year...

Total No. of Questions : 9] [Total No. of Pages : 02

B.Tech. DEGREE EXAMINATION, MAY - 2013

(Examination at the end of Third Year Third Semester)

ELECTRONICS & COMMUNICATIONS

Paper - I : Linear Control Systems

Time : 03 Hours Maximum Marks : 75

Answer Question No. 1 compulsory. (1 × 15 = 15)

Answer One question from each unit. (4 × 15 = 60)

Q1) a) What is meant by control system?

b) Define open and closed loop systems.

c) Explain the principles of superposition.

d) What are the frequency domain specifications.

e) What is meant by non-linear system.

f) What is transfer function.

g) Define Rise time.

h) Define peak time.

i) What is gain margin?

j) Define resonant peak.

k) What is parabolic function?

l) What is Band width.

m) What is meant by cut-off rate.

n) List the types of stabilities.

o) What is state vector, state variable.

UNIT - I

Q2) a) List out the advantages and disadvantages of both open loop and closed loop system.

b) Reduce the block diagram. Show in fig. Find C/R.

N-3094

��

P.T.O.

��

N-3094 2

OR

Q3) Find the overall function of the system whose signal flow graph is shown below.

UNIT - II

Q4) a) List out the standard test signals and give its expressions.

b) Find the response of second order system for underdamped care and when the input isunit step.

OR

Q5) a) Find the response of second order system for overdamped care and when input is unitstep.

b) What are the conditions for stability.

UNIT - III

Q6) a) Explain nyquist stability criterion.

b) Explain the frequency response plots of ideal low pass and high pass filters.

OR

Q7) What are the various steps in the procedure for constructing Root locur.

UNIT - IV

Q8) a) State transition matrix and its properties.

b) Explain Jordan canonical form.

ORQ9) a) Explain controllability and observability.

b) Explain diagonal cononical form.

��

��Total No. of Questions : 9] [Total No. of Pages : 02




(Paper - II) : Electronic Circuits II


Answer Question No. 1 compulsory.

Answer ONE question from each Unit. (4 × 15 = 60)

Q1) a) What is the effect of negative feedback? (1)

b) What is sensitivity? (1)

c) Define Af and A

vf. (2)

d) Define non-sinusoidal oscillator. Give examples. (2)

e) What are the types of RC oscillators? (1)

f) What are the disadvantages in LC oscillator? (2)

g) Define a power amplifier. (1)

h) What is Class - B operation? (1)

i) What are the functions of heat sink? (2)

j) What is cross over distortion? (1)

k) State Barkhausen Criteria. (1)

UNIT - I

Q2) a) Design a transformer Coupled Class B amplifier and explain its function.

b) Discuss the effect of second harmonic generation in power amplifiers.

OR

Q3) a) Draw a direct coupled push pull amplifier and explain.

b) Explain the terms ‘complementary’ and ‘Symmetry’.

UNIT - II

Q4) a) What is the significance of feedback in amplifier?

b) Draw the RC phase oscillator using FET and BJT and explain the function of thesame.

N-3095 P.T.O.

��

N-3095 2

OR

Q5) a) Give the significance of Barkhausen Criterion for Sinusoidal Oscillators.

b) Draw the circuit of a Colpitts Oscillator using BJT and explain the working.

UNIT - III

Q6) a) Explain the working of a stagger turned amplifier.

b) Explain a Balanced Chopper.

OR

Q7) a) Explain the working of a Double tuned transformer coupled amplifier.

b) Write short notes on chopper transients.

UNIT - IV

Q8) a) Design a series regulator and explain it features.

b) Write short notes on UPS.

OR

Q9) a) Draw and explain the function of a shunt regulator.

b) List out the protection techniques in RPS.

��





(Paper - III) : Computer Organisation



Answer ONE question from each unit.

Q1) a) Write about memory read and memory write operations.

b) Write a short note on effective address.

c) What is the structure of Micro instruction format?

d) Write about Reduced Instruction Set Computer?

e) Define hit ratio.

f) What is auxiliary memory?

g) What are the modes of transfer for data?

h) Define priority Interrupt.

UNIT - I

Q2) a) Explain shift micro operations.

b) Explain different phases of Instruction Cycle.

OR

Q3) a) Explain Arithmetic Micro operations.

b) Describe briefly about computer registers.

UNIT - II

Q4) a) Explain micro program with example.

b) Explain about data transfer and manipulation instructions.OR

Q5) a) Explain about control memory.

b) Write about different instruction formats.

N-3096 P.T.O.

��

N-3096 2

UNIT - III

Q6) a) Explain division algorithm for fixed point binary numbers in signed magnituderepresentation.

b) Explain the need for memory hierarchy.

ORQ7) a) Explain about floating point arithmetic operations.

b) Explain about memory management hardware.

UNIT - IV

Q8) a) Explain about Input output processor.b) Explain briefly about DMA (Direct Memory Access).

ORQ9) a) Explain briefly about Serial Communication.

b) Explain the following:• Peripheral devices.• Priority Interrupt.

��





(Paper - IV) : Pulse Circuits




Q1) a) What is linear wave shaping? Give some examples. (2)

b) What is the lowpass circuit lower cut-off frequency. (1)

c) Define rise find write the expression for it. (2)

d) What are the other names of clipping circuits? (1)

e) What is a clamper? (1)

f) What do you mean by biased clamping? (1)

g) What are the limitations of practical clamping circuit? (1)

h) Name the devices that can be used as switches. (1)

i) Define a rise time & fall time of a transistor. (2)

j) What is a Bistable Circuit? (1)

k) What are the applications of Schmitt trigger? (2)

UNIT - I

Q2) a) Derive an expression for the output levels under steady state conditions of a LP circuitexcited by a ramp input.

b) Draw the circuit of a RC-high pass circuit and explain its working.

OR

Q3) a) Discuss the criteria for good differentiation and integration.

b) Draw and explain Ringing circuit.

UNIT - II

Q4) a) Draw the circuit of a transistor which acts as a switch and explain the same.

b) Draw the circuit of a clipping circuit with diode and explain.

N-3097 P.T.O.

��

N-3097 2

OR

Q5) a) Draw a negative clamping and explain it.

b) Draw a circuit to transmit that part of a sine wave which his between – 4v and –7v andexplain its working.

UNIT - III

Q6) a) Draw and explain the base and collector waveforms of a bistable multivibrator.

b) How can hysteresis be eliminated in a Schmitt trigger?

OR

Q7) a) Draw and explain the working of an collector coupled monostable multivibrator.

b) What are the advantages and disadvantages of a direct-connected binary?

UNIT - IV

Q8) a) Explain the basic principles of Miller and Bootstrap time-base generators.

b) Explain the features of an Astable blocking oscillator.

OR

Q9) a) With a neat circuit diagram, explain the working of a simple Current Sweep.

b) Discuss the need for a trapezoidal waveform for linearity correction.

��





(Paper - V) : OOPS and OS




Q1) a) What is the difference between Interpreter & Compiler. (3)

b) What are the different types of control statements? (1)

c) Explain the following: (3)

i) Call by value.

ii) Call by reference.

d) What is a data type? Explain different types of data types. (2)

e) Explain constructor & Destructor with suitable example. (2)

f) Explain the concept of segmentation & paging. (2)

g) Define an operating system. Explain types of operating system. (2)

UNIT - I

Q2) a) What are the characteristics of an object?

b) Discuss the operators in C++.

OR

Q3) Explain the precedence & Associativity of operators.

UNIT - II

Q4) a) What is a Function? What are the different types of Functions?

b) Explain Recursive Function.

OR

Q5) a) Explain about Friend function with suitable example.

b) Explain the concept of function over loading.

N-3098 P.T.O.

��

N-3098 2

UNIT - III

Q6) a) Define Memory Management.

b) Explain in detail the requirements that memory management needs to satisfy.

OR

Q7) Describe the objectives and functions of Operating System and also explain the differentservices provided by the Operating System.

UNIT - IV

Q8) a) What is the difference between internal & external fragmentation?

b) What are the distinctions among logical, relative & physical address?

OR

Q9) Explain Cpu scheduling & Page Replacement algorithm.

��





(Paper - VI) : Analog Communication


Answer Question No. 1 compulsory

Answer ONE question from each Unit

Q1) a) Define modulation. (1)

b) What is the advantage of suppressing carries during transmission. (2)

c) Draw the phasor representation of AM wave. (2)

d) Give the demerits of phase shift method for generation of SSB. (2)

e) Define modulation index in FM. (1)

f) What are the advantages of FM over AM? (2)

g) What do you understand by WBFM? (1)

h) Define thermal noise. (1)

i) What is atmospheric noise? (1)

j) What is De-emphasis? (1)

k) Define Noise temperature. (1)

UNIT - I

Q2) a) Explain the method of generation of DSB-SC wave using ring modulator.

b) Explain the working of switching modulator.

OR

Q3) a) Write short notes on frequency domain of DSB-SC.

b) Explain the coherent detection of DSB-SC modulated wave.

UNIT - II

Q4) a) Explain the generation of SSB-SC wave.

b) Compare AM techniques.

N-3099 P.T.O.

��

N-3099 2

OR

Q5) a) Explain the features of VSB modulated wave.

b) A carries is simultaneously modulated by two sine waves with modulation index of0.3 and 0.4, find the total modulation index.

UNIT - III

Q6) a) How do you generate FM using Armstrong Method.

b) Distinguish between Direct and Indirect method of FM generation.

OR

Q7) a) Write short notes on transmission bandwidth of FM waves.

b) Explain the working of zero crossing detector.

UNIT - IV

Q8) a) Explain the generation of PAM.

b) With neat figure give the working of SSC - SC receiver.

OR

Q9) a) How is noise evaluated in AM receivers?

b) Explain the generation of TDM.

��



(Examination at the end of Third Year Fourth Semester)


(Paper - I) : Linear Integrated Circuits and Applications



Answer ONE question from each Unit.

Q1) a) What is an ohmic contact? (1)

b) What is an op amp? (1)

c) Give the expression for CMRR. (1)

d) What is virtual ground in op-amp? (1)

e) What is cross over distortion? (1)

f) Define ‘Logic threshold’ and ‘Response time’. (2)

g) List the applications of comparator. (2)

h) What is peak detector circuit? (1)

i) Draw an op-amp as voltage follower. (1)

j) Define thermal drift. (1)

k) What is a Sallen - key filter? (1)

l) Why are active filters preferred? (2)

UNIT - I

Q2) a) What are the characteristics of an ideal op amp?

b) Show that an op amp functions as a differentiator.

OR

Q3) a) Explain the working of a Precision rectifier.

b) Explain offset voltage and offset current.

UNIT - II

Q4) a) Explain the function of a saw tooth wave generator.

b) List the limitations of op-amps as comparators.

N-3100 P.T.O.

��

N-3100 2

OR

Q5) a) Draw a neat figure to explain a basic comparator.

b) Explain the phase shift oscillator with neat figure.

UNIT - III

Q6) a) Draw a neat figure and explain the working of a Peak detector.

b) Explain the working of a Parallel A/D converters.

OR

Q7) a) Give a note on D/A conversion fundamentals.

b) Explain the working of a Dual Slope Converter.

UNIT - IV

Q8) a) Show that 555 timer can be used as astable multivibrator.

b) What is a band stop filter and explain its features.

OR

Q9) a) What is a Bandpass filter explain its working?

b) Draw and explain the features of 723 voltage regulator.

��





(Paper - II) : Microprocessors and Interfacing



Answer ONE question from each Unit.

Q1) a) What will TEST instruction perform? (1)

b) Define bit and byte. (2)

c) What is Address? (1)

d) What is ALE? (1)

e) What is tristate logic? (1)

f) What are HOLD and HLDA instructions do? (2)

g) What is stack pointer? (1)

h) What is DAA and DAD? (2)

i) What is segment base? (1)

j) What are control bits? (1)

k) What are the uses of Hardware interrupts? (2)

UNIT - I

Q2) a) Draw the 8086 architecture and briefly discuss the architecture details.

b) List the functions that are for the assembler directives of 8086.

OR

Q3) a) What do you mean by pipelined architecture? How is it implemented in 8086.

b) Explain the physical address formation in 8086.

UNIT - II

Q4) a) Write a program in Assembly language to count number of Os in a 16 bit binarystring.

b) Explain base relative - plus - index addressing.

N-3101 P.T.O.

��

N-3101 2

OR

Q5) a) Explain the usefulness of the following instructions in 8086.

i) LOCK.

ii) TEST.

iii) XLAT.

iv) LES.

b) Write a ALP to reverse the bits in a 16 bit number.

UNIT - III

Q6) a) Draw the interfacing scheme of 8086 in memory mapped I/O.

b) Give the A/D converter specifications.

OR

Q7) a) Explain the D/A converter operation.

b) What are the disadvantages of software approach used for interfacing keyboard anddisplay.

UNIT - IV

Q8) a) Illustrate different modes of operations of 8253/54.

b) Explain the operating modes of 8259.

OR

Q9) a) Explain the architecture of 8251A with a functional block diagram.

b) Write short notes on RS232C.

��

��





(Paper - III) : Digital Signal Processing


Answer Question No. 1 compulsory. (1 × 15 = 15)

Answer ONE question from each unit. (4 × 15 = 60)

Q1) a) What is the relation between impulse response and transfer function of a system?

b) What is system bandwidth?

c) Define Energy spectral Density?

d) What is the causal system?

e) What is the time invariant system ?

f) What is the relation between bandwidth and rise time ?

g) Define power spectral density?

h) What are the two theorems of convolution associated with Fourier transform?

i) Give the relation between convolution and correlation ?

j) What is the cross correlation for orthogonal signals ?

k) Explain sampling frequency?

l) What is anti-aliasing filter?

m) What is meant by interpolation?

n) What is the significant of Z-Transform ?

o) What is meant by Radix-Z FFT ?

UNIT - I

Q2) a) An LTI system has unit sample response h(n)=u(n)-u(n-N). find the amplitude andphase spectra?

b) If x1(n) and x

2(n) are two sequence, derive the linear convolution of two sequences

using circular convolution.

OR

Q3) a) Find the inverse Z-transform 2( )

3 4 1

zx t

z z

for ROC

11

3z .

b) Prove that impulse response of an LTI system is absolutely summable for stability ofthe system?

N-3102

��

P.T.O.

��

N-3102 2

UNIT - II

Q4) a) An 8 Point sequences is given by x(n) = {2, 2, 2, 2, 1, 1, 1, 1}. Compute DFT of x(n)by Radix-2 DIT FFT. Also sketch magnitude and phase spectrum?

b) Define DFT. State and Prove time and frequency shifting properties of DFT?

OR

Q5) a) Determine the 4 point DFT of the sequence x(n) = {1, 0, 2, 1} using DIT - FFTalgorithm?

b) Define DFT and Prove the modulation and Time Shifting properties of DFT.

UNIT - III

Q6) a) Design an analog Butterworth filter has a - 2dB passband attenuation at a frequencyof 20 rad/sec and at least - 10dB stop band attenuation at 30 rad/sec(assume

c = 21.368 rad/sec)

b) Discuss Bilinear transformation method of deriving IIR Digital filter from correspondinganalog filter?

OR

Q7) Determine the system functions H(z) of the lowest order chebyshev digital filter that meetsthe following

a) 0.5 db ripple in the pass band 0 < || < 0.2 .

b) 50 dB attenuation in the stop band 0.2 > || < use the bilinear transformation.

UNIT - IV

Q8) a) A certain discrete-time LTI filter has the following data :i) Poles are at 0.2 and 0.6

ii) Zeros are at - 0.4 and origin

iii) Gain of filter is 5

Determine Direct form-II realization and cascade form realization?

b) What is FIR filter? Compare an FIR filter with an IIR filter?

OR

Q9) a) Design a low pass FIR filter using Rectangular window by taking 9 samples of w(n)and with a cutoff frequency of 1.2 radians/sec?

b) Realize the following system by cascade and parallel form given

1 2

1 2

2 8 6( )

1 8 12

z zH z

z z

.

��


B.Tech. DEGREE EXAMINATION, MAY. - 2013(Examination at the end of Third Year Fourth Semester)

ELECTRONICS & COMMUNICATIONS(Paper - IV) : Electronic Measurements and Instrumentation


(15 × 1 = 15)Q1) a) List Dynamic errors.

b) What is a passive transducer?

c) Which bridge is used for higher range of resistance?

d) Define sensitivity.

e) What do you mean by precision?

f) What are the types of strain gauges?

g) What are the applications of Digital Data Systems?

h) Give the range of ECG waveform.

i) What are the applications of thermistor?

j) What is a rectifier?

k) Which bridge is used to measure capacitance?

l) Define Inductance.

m) List the applications of a multimeter.

n) What are the applications of Encoder?

o) What are limiting errors?

UNIT - I

Q2) a) Explain the working of a shunt type ohmmets.

b) Write short notes on probability of errors.

OR

Q3) a) Draw and explain Guarded wheatstone bridge.

b) Write short notes on DC instruments.

UNIT - II

Q4) a) Explain the working of a electronic multimeter.

b) Draw a neat figure and explain the working of a sampling oscilloscope.

OR

N-3103 ��

��Q5) a) Explain the AC voltmeter using rectifiers with neat figure.

b) List the applications of spectrum analyser.

UNIT - III

Q6) a) Explain the measurement of resistance using thermistor.

b) Write short notes on shaft encoder.

OR

Q7) a) Explain the working of a piezo-electric transducer.

b) Give advantages and disadvantages of thermocouples.

UNIT - IV

Q8) a) Explain the features of ECG.

b) Explain the function of a multiplexer.

OR

Q9) a) Give the principles of EMG.

b) Discuss the role of computers in instrumentation.

��

N-3103 2


B.Tech. DEGREE EXAMINATION, MAY - 2013(Examination at the end of Third Year Fourth Semester)

ELECTRONICS AND COMMUNICATIONS(Paper - V) : DIGITAL COMMUNICATIONS


Answer Question No.1 compulsory (15 × 1 = 15)

Q1) (a) What is the need of Quantization?(b) Define Bit Duration in a PCM system?(c) How many sinc functions are needed in modified duo binary filter?(d) Define Ideal Nyquist’s Criteria.(e) What is the The function of precoder in duo binary system?(f) What is the transmission bandwidth required in case of raised cosine solution?(g) For zero ISI what is the Nyquist bandwidth?(h) What is the bandwidth of ASK?(i) What is Uncertainty?(j) What is mean by Correlative coding?(k) Give the expression for Channel capacity?(l) Define Code Rate?(m) What is the another name of BPSK?(n) What is the main use of Syndrome?(o) When a code is said to be separable?

Answer any ONE question from each unit (4 × 15 = 60)

UNIT - I

Q2) (a) What are the Limitations of Delta Modulation Systems? How are they overcome byAdaptive Delta Modulation?

(b) A communication channel bandwidth 75 KHz is required to transmit binary data at arate of 0.1 Mb/s. using raised cosine pulses. Determine the roll-off factor α.

OR

Q3) (a) A binary channel bit rate = 36000 bits/sec is available for PCM voice transmission.Find appropriate values of the sampling rate, quantizing level and the binary digitsassume f

m = 3.2KHz.

(b) What is the need of Matched filter? List out the Properties of Matched Filter.

UNIT - II

Q4) (a)(b) Derive the expression for probability of error in BFSK.

OR

Q5) (a)(b) Find the transmitted Phase Sequence for this Input binary sequence {b} = {1, – 1, 1,

– 1, – 1, – 1, 1, 1} and sketch the transmitted waveforms for QPSK?

UNIT - III

Q6) (a) Explain the concept of entropy? Condition for Maximum Entropy? List out theproperties of entropy?

N-3104

��

��

N-3104 2

(b) Calculate efficiency for the following message ensemble using Huffman code :

[X] = [x1 x

2 x

3 x

4 x

5 x

6 x

7]

[P] = [0.4 0.2 0.12 0.08 0.08 0.08 0.04]

OR

Q7) (a) Explain the cocept of Mutual Information of a channel? List out its properties?(b) Explain about Information Capacity Theorem?

UNIT - IV

Q8) (a) List out the conditions to define Linear Block codes as Hamming Codes? Discusserror detection and correction capabilities of Hamming Codes?

(b) The generator matrix for a (7, 4) block code is Find all the codeword’s of the code?

G =

⎥⎥⎥⎥

⎦

⎤

⎢⎢⎢⎢

⎣

⎡

1111000

1010100

1100010

1100001

OR

Q9) (a) The generator polynomial of a (7, 4) cyclic code is g (x) = 1 + x + x2. Find all thecodeword’s for the given messages :(i) 0 1 1(ii) 0 1 1 1(iii) 1 1 1 0(iv) 1 1 0 1(v) 1 1 1 1?

(b) List out the advantages of Block codes and Convolutional codes?

��


B.Tech. DEGREE EXAMINATION, MAY - 2013(Examination at the end of Third Year Fourth Semester)

ELECTRONICS AND COMMUNICATIONS(Paper - VI) : Communication Systems


Answer Question No.1 compulsory (15 × 1 = 15)

Answer ONE question from each unit (4 × 15 = 60)

Q1) a) What is meant by tracking error in radio receiver?b) What is meant by selectivity?c) What is meant by fidelity?d) Define master oscillator.e) What are the limiters in TRF receiver?f) What is the use of RF power amplifier?g) What is digital time division switching system?h) What are the advantages of electronic switching over manual switching?i) What is meant by Teletext service?j) What is Dark Current?k) Define Aperture correction?l) Explain the phenomena of Photoconductive lag.m) Give the Significance of Chromacity Diagram.n) What is color burst?o) Define Depth of Field.

UNIT - I

Q2) a) A super heterodyne receiver is to tune the range from 4-10MHz with an IF of 1.8MHz.Calculate the range of oscillator frequency and the range of Image frequency.

b) Write in detail about the Limiters in Radio Receiver.

OR

Q3) a) What is Delayed AGC and what are the merits compared to simple AGC?b) What is the necessity for Tracking in Radio Receivers? Explain briefly with circuit

Diagram.UNIT - II

Q4) a) What is the importance of a steady current flowing through a carbon Microphone? Isthe harmonic Distortion affected by a change in the energizing current?

b) Write about the design parameters for time division space switching and comparewith that of a space division switch.

OR

Q5) a) Discuss in detail about Distributed SPC?b) Discuss about phased operation and slotted operation in time division time switching?

N-3105 ��

��

N-3105 2

UNIT - III

Q6) a) Explain how horizontal sync pulses are separated from composite video signal?b) Which type of modulation is preferred for TV transmission among positive and negative

modulation. Justify it?

OR

Q7) a) Write down the principle of operation, draw and explain the constructional details ofVidicon.

b) Explain formation of chrominance signals.

UNIT - IV

Q8) a) Explain the concept of mixing of colors with the help of Venn diagram.b) Describe the construction of a color TV camera and its Optical System using Dichroic

mirrors or Prisms?OR

Q9) a) Draw the block diagram of NTSC encoder? Explain RGB inputs, YIQ signals andmixer outputs?

b) Write short notes on DTH.

��

Date post:	17-May-2018
Category:	Documents
Upload:	haanh
View:	228 times
Download:	0 times

B.Tech. DEGREE EXAMINATION, MAY - 2013 … · · 2014-02-03(Examination at the end of Third Year...

Documents