b.tech. degree examination, dec. - 2013 (examination at the … · 2014-08-21 · b) a 10µf...

(DEC311)

B.Tech. DEGREE EXAMINATION, DEC. - 2013

(Examination at the end of Third Year Third Semester)

Electronics & Communications

Paper - I : LINEAR CONTROL SYSTEMS

Time : 3 Hours Maximum Marks : 75

Answer question no.1 compulsory (15×1=15)

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

1) a) What is characteristic equation?

b) What is impulse function?

c) What is summing point?

d) What is loop gain?

e) What is steady state response?

f) What is settling time?

g) What is asymptotic stability?

h) What are the advantages of frequency domain response?

i) What is phase margin?

j) What are the advantages of phase variable?

k) What is polar plot?

l) What is meant by linearity?

m) What is meant by functional block?

n) What is peak overshoot?

o) Define the term compensator.

UNIT-I

2) a) Compare open loop and closed loop control systems. 7M

b) Clearly bring out, from basics, Force-current and Force-Voltage analogies. 8M

(OR)

3) a) With the help of neat diagrams, explain the working of any two practical examples for

closed loop control systems. 7M

b) What is the importance of 'impulse response' in system studies? How is a transfer function?

Obtained for a given physical system? How is it related to the impulse response? 8M

UNIT-II

4) a) For a typical first order transfer function, derive the expression for unit step response.

Hence define 'time constant', and 'settling time'. Sketch the response indicating all salient

features. 7M

b) What are the important time domain specifications considered for analysis and design of

systems? Define each of them with respect to prototype second order system. Give the

expressions and mention the significance of each quantity in the expressions. 8M

(OR)

5) Draw a neat sketch of the unit step response of prototype under damped second order system,

indicating all important quantities and salient features. Distinguish between the 'transient

response' and 'steady state response'. 15M

UNIT-III

6) Briefly explain the Root Locus concept. 15M

(OR)

7) What are the effects of adding

i) Pole ii) Zero to G(s) H(s) on the root loci? 15M

UNIT-IV

8) a) What do you understand by 'state transition matrix'? State and prove its properties.8M

b) Obtain the solution for the standard non homogeneous state equation. 7M

(OR)

9) What are the various types of compensating schemes used in control systems? Explain the

concept of cascade lead compensator of control systems with the help of an example.15M

* * * *

(DEC 312)


(Examination at the end of IIIrd Year Third Semester)


Paper - II : ELECTRONIC CIRCUITS - II


Answer Question no.I Compulsory

Answer ONE question from each unit

1) a) Efficiency of power amplifier? (1M)

b) What is the effect of negative feedback? (2M)

c) What is sensitivity? (1M)

d) What is the feedback concept, explain? (2M)

e) What are barkhausen criteria? (2M)

f) What is chopper switch? (1M)

g) List of the applications of colpitt’s oscillator? (2M)

h) What is cross over distortion? (2M)

i) Define chopper amplifier? (2M)

UNIT – I (4 × 15 = 60) 2) a) Explain why a power amplifier is also known as a large-signal amplifier.

b) Explain the operation of Class B power amplifier with suitable circuit diagrams.

(OR)

3) a) State the advantages achieved by using a push-pull amplifier circuit, instead of

connecting the two transistors in parallel.

b) Explain the harmonic distortion and collector dissipating rating in connection with power

amplifiers.

UNIT – II

4) a) Design series-shunt feedback amplifier using their characteristics.

b) The RC network of a Wein bridge oscillator consists of resistors and capacitors of

values R1=R2=220 kΩ and C1=C2=250 PF. Determine the frequency of oscillations.

(OR)

5) a) Explain the pole-zero and amplitude characteristics of staggered tuned amplifier.

b) Explain the principle of working of the Wein bridge oscillator circuit. Draw the phase

shift network that determines the frequency of oscillations.

UNIT – III

6) a) Explain the operation of single tuned transistor amplifier?

b) A transistorized two-stage stagger-tuned amplifier has a pole-zero pattern like the one

shown in below. The pertinent dimensions are p = 10-6

rad/s, = 1500 rad/s and

= 2500 rad/s. Both transistors have a transconductance of gm=40m/Ω, and the total

shunt resistance in each stage is R1=R2=0.75. Find the peak amplification AP, the

peak-to-valley ratio (Ap/Ac), the triple-point bandwidth BW, the half-power

bandwidth, and the triple-point frequencies.

(OR)

7) a) Explain the operation of stagger tuned transistor amplifier? And find its cut-off

frequency.

b) Design single tuned transformer coupled amplifier.

UNIT – IV

8) a) Explain the series and shunt voltage regulators.

b) Explain the voltage sweep circuit.

(OR) .

9) a) Explain the switching mode power supplies.

b) Explain the current sweep circuit.

(DEC 313)

B.Tech DEGREE EXAMINATION, DEC. - 2013

(Examination at the end of Third Year Third Semester)

ELECTRONICS & COMMUNICATIONS

Paper - III : Computer Organisation


Answer Question No. 1 compulsory. (15)

Answer One Question from each unit. (4 x 15 = 60)

1) Write short notes on:

a) Memory references instructions.

b) Register.

c) Timing signals.

d) Stack operations.

e) Program status word.

Unit-I

2) Explain various arithmetic micro operations.

OR

3) a) Describe the control unit of a basic computer.

b) Explain the design of Accumulator logic.

Unit-II

4) a) Explain Micro programmed control organization.

b) Explain about Zero & Three address instructions.

OR

5) Explain various addressing modes.

Unit-III

6) Describe the hardware implementation for signed magnitude multiplication.

OR

7) a) Explain about Memory hierarchy.

b) Discuss about Memory maps.

Unit-IV

8) a) Distinguish between memory mapped I/O and Isolated I/O.

b) Explain Asynchronous serial transfer.

OR

9) What is Priority Interrupt. Explain different types of priority interrupts.

(DEC 314)

B.Tech. DEGREE EXAMINATION, DEC - 2013

(Examination at the end of IIIrd year)

Electronics & Communication

Paper - IV : PULSE CIRCUITS

Time : Three hours Maximum : 75 marks

Answer Question No. 1 compulsory (15)

Answer ONE question from each unit. (4x15=60)

1) a) Draw the circuit of a RC high pass ? (1)

b) Define rise time ? (1)

c) State clamping theorem ? (2)

d) What is peeking ? (1)

e) Define Slew rate ? (1)

f) Define Duty Cycle ? (1)

g) What is the precision diode ? (2)

h) State the two conditions of oscillator ? (2)

i) Write about the zero crossing detectors ? (2)

j) What are the applications of blocking oscillators ? (2)

UNIT - I

2) a) Sketch in integrating circuit with a square wave input. Explain the wave shape

obtained.

b) A 10µf capacitor is charged from a 5V source via a 10 resistance. Calculate the

capacitor voltage after 50ms if it is initially charged to -2V.

OR

3) a) Discuss the response of RC high pass circuit for square wave input with different

time constants and obtain the output voltage expression.

b) Prove that RC low pass circuit acts as integrator and obtain the condition for good

integrator.

UNIT - II

4) a) Draw the circuit of Bottom chipper and explain its working with neat waveforms.

Also obtain its transfer characteristics.

b) State and prove the clamping circuit theorem.

OR

5) a) Explain an uncompensated attenuator.

b) Explain the working of a Ringing Circuit.

UNIT - III

6) a) Explain a clipping circuit.

b) Explain the design of a transistor as a switch.

OR

7) a) Explain the operation of Astable multi with neat circuit and waveforms.

b) Define and prove the duty cycle of astable multivibrator ?

UNIT - IV

8) a) Draw the circuit diagram of exponential sweep circuit and obtain and expression for

slope error.

b) Explain the working of a simple transistor current sweep circuit with necessary

waveforms.

OR

9) Explain the operation of Miller and Boot strap sweep circuit.

(DEC 315 )


(Examination at the end of Third Year Third semester)

ELECTRONICS AND COMMUNICATIONS

Paper - V : OOPS AND OS


Answer Question No.1 is compulsory (15)

Answer one question from each Unit (4x15=60)

1) a) Explain the benefits of OOPS.

b) Explain the type casting

c) Explain call by value and call by reference

d) Explain process states

e) Define TLB

f) Define thrashing

g) Define paging

Unit -I

2) a) Describe the applications of OOPS.

b) Explain the basic structure of c++.

OR

3) Explain any four different types of operators in c++.

Unit -II

4) Explain the inline function with a suitable example.

OR

5) What is a constructor. Explain different types of constructors.

Unit -III

6) What is IPC. Explain the implementation of IPC.

OR

7) What is the use of scheduling algorithms and explain any 2 scheduling

algorithms.

Unit -IV

8) What is paging. Explain paging of logical and physical memory.

OR

9) What is page replacement? Explain optimal page replacement methods.

(DEC 316)

B.Tech. DEGREE EXAMINATION, DEC. 2013

(Examination at the end of Third Year)(IIIrd Semester)


Paper – VI : Analog Communication


Answer Question No.1 compulsory

Answer One question from each Unit

[15 x 1 = 15]

[4 x 15 = 60]

1) a) Draw the block diagram of communication system. [2]

b) Define angle modulation ? [1]

c) List out the advantages of SSB over DSB. [1]

d) What is meant by Carson’s rule ? Write down the expression for it? [2]

e) Define Fidelity. [1]

f) Which modulation is suitable for transmission of video signals and why ?

[2]

g) Define white noise. [1]

h) What are the generation and demodulation methods of DSB-SC ? [2]

i) What are PAM, PWM and PPM ? [2]

j) Define threshold effect. [1]

UNIT - I

2) a) With necessary expressions, waveforms and spectrums, Explain AM for an

arbitrary baseband signal m(t).

b) In an AM-SC system, modulating signal is a single tone sinusoid 4cos2π103t,

which modulates a carrier signal 6cos2π106t. Write the equation of modulated

wave. Plot the two sided spectrum of the modulated wave. Calculate the

amount of power transmitted.

OR

3) a) Explain the demodulation of DSB-SC by using COSTAS Loop with a neat

block diagram.

b) Explain the working of envelope detector with a neat circuit diagram.

UNIT - II

4) a) Explain the principle of VSB transmission. Compare VSB with SSB and AM

in terms of power requirement, Bandwidth and area of applications.

b) Explain how coherent detection accomplishes the demodulation of SSB

signal.

OR

5) a) Explain phase shift method of SSB generation with a neat block diagrams.

b) Define multiplexing. Explain with a block diagram the process of FDM.

UNIT - III

6) a) Explain how the FM is generated using Armstrong method with a neat block

diagram.

b) Give the comparison of FM and AM.

OR

7) a) Draw the block diagram of PLL technique for demodulating an FM signal

and explain its working.

b) Write short notes on “Balanced frequency discriminator”.

UNIT - IV

8) a) Explain about TDM with a neat figures.

b) Explain clearly the generation and demodulation of PWM with the help of

necessary diagram.

OR

9) a) Derive an expression for output SNR for FM demodulator.

b) How is PDM wave converted into PPM system ?

(DEC 321)


(Examination at the end of Third Year Fourth Semester)


Paper - I : Linear Integrated Circuits and Applications


Answer Question No. 1 compulsory. (15)

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

1) a) List out ideal characteristics of op-amp?

b) Mention the applications of an instrumentation amplifier.

c) Define slew rate? How the slew rate measured?

d) Draw the block diagram of oscillator?

e) Write the advantages of instrumentation amplifier?

f) Mention the non linear applications of op-amp.

g) Define CMRR and write the expression for it?

h) Name the direct type and integrated type analog to digital converters?

i) Draw the circuit diagram of all pass filter and write the output expression for

it.

j) What is meant by virtual ground?

k) List out the applications of PLL.

UNIT - I

2) a) Explain the working of an Op-amp differentiator using relevant diagrams

and expressions. Also draw the circuit diagram of a practical differentiator.

b) For an op-amp PSRR = 60 db (min), CMRR = 104 and the differential mode

gain is 105, the voltage changes by 20 V in 4 µ sec. Calculate

i) Numerical value of the PSRR.

ii) Common mode gain.

iii) Slew rate.

OR

3) a) Explain the operation of summing amplifier using relevant circuit diagram

deriving the expression for output. Also Draw the circuit diagram of an

amplifier which realizes the output

Vo = V1 – V2 + V3 – V4 where V1 , V2, V3 and V4 are input voltages.

b) Explain the operation of full wave rectifier using Op-amp with relevant

diagrams and waveforms.

UNIT - II

4) a) Explain the voltage controlled oscillator 566. And also draw the pin

configuration diagram, block diagram and connection diagram of VCO?

b) Discuss important characteristics of a comparator and the limitations of op-

amps as comparators.

OR

5) a) Design a differentiator to differentiate an input signal that varies in

frequency from 10 Hz to about 1 KHz. If a sine wave of 1 V peak at 1000

Hz is applied to this differentiator draw the output waveforms.

b) With suitable circuit diagram explain the operation of a triangular wave

generator using a comparator and a integrator.

UNIT - III

6) a) Describe the operation of an R – 2R ladder type DAC.

b) Draw the circuit diagrams for peak detector, sample and hold circuits and

explain them?

OR

7) Write short notes on:

a) Flash type Analog to Digital converter.

b) Explain the operation of dual slope ADC.

UNIT - IV

8) a) Explain about the free running range, capture range and lock range in PLL

with necessary equations.

b) Draw the diagram of a second order low pass filter and obtain the expression

for transfer function, write the expression for cut-off frequency.

OR

9) a) Design a wide band-reject filter using first-order high pass and low pass

filters having fL = 2 KHz and fH = 400Hz respectively.

b) Derive the expression for the output pulse width ‘T’ when 555 timer is

operated in monostable multivibrator configuration.

(DCE 322)

B.Tech. DEGREE EXAMINATION, DEC. 2013

(Examination at the end of Third Year)(Fourth Semester)

Electronics and Communications

Paper – II : MICROPROCESSORS & INTERFACING


Answer Question No.1 compulsory

Answer ONE question from each Unit

[15]

[4 x 15 = 60]

1) a) What is Microprocessor?

b) Why data bus is bidirectional?

c) What are the control signals?

d) What is READY?

e) Write the flags of 8086.

f) What are the interrupts of 8086?

g) Define machine cycle.

h) What is LAHF and SAHF?

i) Define T-state.

j) What is the function of parity flag?

k) Define opcode and operand.

UNIT – I

2) a) With the reference to 8086 CPU, explain the role of the following:

i) Instruction queue, ii) Segment registers,

iii) General purpose registers.

b) Discuss the procedure for the coding the intersegment and intrasegment jump

and call instructions.

OR

3) a) Explain the function of the following signals of 8086:

NMI, MN/MX’, ALE and HOLD

b) What is addressing mode? Explain the different type of addressing modes in

8086 with examples.

UNIT – II

4) a) Write an ALP to arrange N numbers in ascending order using bubble sort

technique.

b) Write a program to check whether the entered string is PALINDROME or

not.

OR

5) a) Write an ALP to multiply a two 32 bit numbers and store the 64 bit product

in memory.

b) Write an ALP to convert a 2-digit BCD number to binary number.

UNIT - III

6) a) Explain the fundamental concepts of DRAM controller.

b) Explain the interrupt operation? Compare software and hardware interrupts in

8086.

OR

7) a) Explain the interrupt structure of 8086 and interrupt vector table.

b) Explain DOS and BIOS interrupts.

UNIT – IV

8) a) Explain the bit assignment for mode instruction format of 8251 for both

synchronous and asynchronous modes.

b) Explain the operation modes of 8259.

OR

9) a) Discuss the 8251A control word register.

b) Explain the function of DMA data transfer.

(DEC323)



Electronics& Communication Engineering

Paper - III : DIGITAL SIGNAL PROCESSING


Answer Question No.1 is compulsory [ 15]

Answer ONE question from each unit. [4 X 15 = 60]

1) a) Define Parseval’s theorem?

b) State the condition for stability of discrete time systems?

c) What is the linear time invariant system?

d) What is the differentiation of transformation property in Z transforms?

e) What is the region of convergence for an impulse function in

Z-transforms?

f) How many complex multiplications, additions are needed in DFT and

FFT?

g) What is meant by' downsampling?

h) What filter has ripples in pass band and flat response in stop band?

i) Name three window techniques for FIR filters?

j) What is the anti-imaging filter?

k) What are the two conditions required to design a digital IIR filter from its

analog counterpart?

l) What is meant by radix-2 DITFFT?

m) Define Region of convergence?

n) Define a causal system?

o) State on stability of IIR filter when compared to FIR filter?

UNIT - I

2) a) Perform periodic convolution on given two sequences using concentric

circles method x(n) = 3, 2, 1, 2 ; h(n) = 1, 2, 1, 2.

b) Using partial fraction method determine the causal signal x(n) having the Z

transform ( ) ( )2

1 1

1( ) .

1 2 1X z

z z− −=

− −

OR

3) a) Determine the impulse and step response for a system described by the

following equation3 1

( ) ( 1) ( 2) ( )4 8

y n y n y n x n= − − − + . Assume zero initial

conditions.

b) Find Inverse Z-transform of 1

1

1( ) , 1

1X z kz

kz

−−

= <−

using Long division

method.

UNIT - II

4) a) An 8 point discrete sequence is given by x(n) = 1, 1, 1, 1, 2, 2, 2, 2.

Compute DFT of x(n) by Radix-2 DIFFFT.

b) State and prove DFT property: circular time shift of a sequence.

OR

5) a) State and prove circular frequency shift and time shifting properties of DFT.

b) Determine DFT of the sequence x(n) = 1, 0, 0, 0 using either FFT

algorithms.

UNIT - III

6) a) Determine the order and poles of a LPF Butterworth that has a -3dB

bandwidth of 500Hz and an attenuation of 40dB at l000Hz.

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

OR

7) a) Discuss Impulse Invariant method of deriving IIR Digital filter from

corresponding analog filter?

b) For the analog Transfer Function 2

( )( 1)( 2)

H ss s

=+ +

determine H(z) using

Impulse Invariant method, assume T = 1 sec.

UNIT - IV

8) a) Realize

1

1 2 1 2

11

2( )1 1

1 14 2

z

H z

z z Z z

−

− − − −

+= − + − +

using cascade structure.

b) Give the comparison of FIR filters with IIR filters.

OR

9) a) Realize the following system by parallel form 1 2

1 2 3

1 3 2( )

3 3 11

8 32 64

z zH z

z z z

− −

− − −

+ +=

+ − −.

b) Design an FIR low pass filter satisfying the following

specifications 0.1p dBα ≤ 44.0s dBα ≤

20rad/ sec;pw = 30 rad/ sec;sw = 100rad/ secsfw =

(DEC 324 )


(Examination at the end of Third Year Fourth semester)


Paper - IV : ELECTRONIC MEASUREMENTS AND INSTRUMENTATION


Answer Question No.1 is compulsory (15)

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

1) a) Define Precision.

b) What is a multimeter?

c) Which bridge is used for measurement of Inductance?

d) What is a Q- meter?

e) What is the use of a Spectrum Analyzer?

f) Define Transducer.

g) What are the types of Strain gauges?

h) Define Gauge factor.

i) What are the advantages of Thermocouples?

j) Define Mutual Inductance.

k) Write the full form of RVDT.

l) What is the use of a Piezo electric transducer?

m) What are the advantages of Data Acquisition Systems?

n) Give the principles of ECG.

o) What is the use of EMG?

Unit -I

2) a) What are the types of errors and what are the precautions to be taken to

minimize them?

b) Explain in detail about Series type Ohmmeter.

OR

3) a) Draw and explain Wien bridge.

b) Explain in detail about DC Voltmeters.

Unit -II

4) a) Explain the working of True RMS Voltmeter.

b) With neat diagram explain the working of Sampling Oscilloscope.

OR

5) a) Explain in detail about Q-meter.

b) Explain about basic Spectrum Analyser.

Unit -III

6) a) Describe with the help of a diagram the measurement of displacement using

potentiometers.

b) Explain the working of Unbonded Strain gauge with neat diagram.

OR

7) a) Explain in detail about Capacitive Transducers.

b) What are the advantages and disadvantages of Thermocouples.

Unit -IV

8) a) Explain with a block diagram a generalized Data Acquisition System

(DAS).

b) What is Signal conditioning? Why is it necessary in a DAS.

OR

9) a) Explain the operation of Time division multiplexing system.

b) Give the principles of Electromyography.

(DEC325)



Electronics and Communications

Paper-V: DIGITAL COMMUNICATIONS

Time: 03 Hours Maximum Marks: 75

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

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

1) a) Define Bit rate.

b) State the sampling theorem.

c) Define bit duration in a PCM system.

d) Define M-ary signalling scheme.

e) What is the another name for BPSK?

f) What is the main use of Syndrome?

g) Define information rate.

h) State Shannon’s theorem.

i) State the capacity of noisy channel?

j) Define hamming weight and distance?

k) What is convolution code?

l) List two advantages of convolution codes.

m) What is function of precoder in duo binary system?

n) What is code rate?

o) When a code is said to be separable?

UNIT - I

2) a) Explain the importance of a predictor in a DPCM.

b) What need of matched filter? List out the properties of matched filter.

OR

3) a) Explain the working of delta modulation system with a neat block diagram.

b) A binary channel bit rate = 36000 bits/sec is available for PCM voice

transmission.

Find appropriate values of the sampling rate, quantizing level and binary

digits assume fm=3.2kHz .

UNIT - II

4) a) Explain the signal space representation of a QPSK.

b) What are the advantages and disadvantages of digital modulation schemes?

OR

5) 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

6) a) Explain the concept of entropy and its properties.

b) Write short notes on the following

i) Mutual information

ii) Self information.

OR

7) a) Explain logarithmic measure for information.

b) Explain Shannon-fano coding with an example.

UNIT - IV

8 a) Explain matrix description of linear block codes.

b) What is meant by forward error correcting codes state its advantages.

OR

9) a) Explain various methods for describing convolution codes.

b) Explain convolution codes with suitable diagram.

(DEC326)

B. Tech. DEGREE EXAMINATION, DEC. - 2013



Paper – VI : COMMUNICATION SYSTEMS


Answer Question No.1 compulsory. (15)

Answer ONE Question from each Unit. (4X15=60)

1) a) What is meant by ganged tuning?

b) Define image frequency.

c) Define fading.

d) Define fidelity.

e) What are the advantages of super heterodyne receiver?

f) What are the advantages of electronic switching?

g) Classify different switching systems?

h) Name any 2 CCIR standards.

i) Draw the circuit diagram of simple telephone circuit.

j) What is meant by subscriber loop signaling?

k) What are primary colors?

l) What is dark current?

m) What is color burst signal?

n) What is meant by VSB?

o) How much bandwidth is required for video signal transmission?

UNIT - I

2) a) Draw and explain Armstrong FM transmitter.

b) Explain receiver characteristics and measurements in detail.

OR

3) a) Draw and explain high level modulated AM transmitter.

b) Draw and explain the block diagram of TRF receiver and mention its limitations.

UNIT – II

4) a) Explain about stored program control in electronic space division switching

systems.

b) Explain about distributed SPC in detail.

OR

5) a) Explain about combination switching in detail.

b) Explain about Time multiplexed space switching in detail.

UNIT – III

6) a) Explain the operation of Plumbicon camera tube with neat diagram.

b) Explain the need of pre-equalizing and post-equalizing pulses with neat

sketch.

OR

7) a) Explain the block diagram of TV broadcast receiver.

b) Explain the various characteristics of a TV camera tube.

UNIT – IV

8) a) Write the differences between additive mixing and subtractive mixing of

colors.

b) Explain the construction and working of Triticon color picture tube.

OR

9) a) Draw the block diagram of PAL encoder and explain its operation in detail.

b) Write short notes on cable TV.

E E EE E EE E EE E E

b.tech. degree examination, dec. - 2013 (examination at the … · 2014-08-21 · b) a 10µf...

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