(DEC 311) - Anucdeanucde.info/DEC11QPS/37-BTEC3.pdf · 2012-02-12 · 2. (a) Draw the output...

(DEC 311)

B.Tech. DEGREE EXAMINATION, DECEMBER 2011.

(Examination at the end of Third Year)

Electronics and Communications Engineering

Paper I — LINEAR CONTROL SYSTEMS

Time : Three hours Maximum : 75 marks

Answer Question No. 1 compulsorily. (15 1 = 15)

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

1. (a) What are the advantages of closed loop system over open loop system?

(b) What is control system?

(c) What are the components of feedback control system?

(d) Define poles and zeros.

(e) Define rise time.

(f) What are static error constants?

(g) What is impulse response?

(h) What is the requirement for BIBO stability?

(i) What is frequency response?

(j) Define Bandwidth.

(DEC 311) 2

(k) What is the necessary condition for stability?

(l) What is root locus?

(m) What are the properties of state transition matrix?

(n) What is compensating network? Why is it used?

(o) Define controllability.

UNIT I

2. (a) Find the transfer function of the circuit shown :

(b) For the system whose signal flow graph is

shown by Fig. 1. Find )()(

sRsY

Fig : 1 Or

(DEC 311) 3

3. (a) Determine the guidelines to transfer function of mechanical rotational system.

(b) Construct the block diagram of field controlled dc motor.

UNIT II

4. (a) Derive the transient response of the second order under damped system when it is subjected to unit step input.

(b) Determine the ranges of k such that the characteristic equation

0)74()57()1(3 23 ksksks has roots more negative than 1s .

Or

5. (a) Using routh criterion determine the locations of the roots of the following characteristic equation and comment on the stability of the system :

0153513242 23456 ssssss .

(b) What is the unit step response of the system shown in figure?

(DEC 311) 4

UNIT III

6. (a) State the different rules for the construction of root locus.

(b) Draw the Nyguist plot for the open loop transfer function given below

)1)(21(1)()( ssSsHsG

and obtain the gain margin and phase margin.

Or

7. The open loop transfer function of a control system is given by

)204()4(/)()( 2 sssSKsHsG

Sketch the root locus and show all the salient points on the locus.

UNIT IV 8. (a) What are the various steps for design of

phase lag network? What will be the effect of phase lag network?

(b) Define state variable, state vector, state space representation of system.

Or 9. A discrete – time system has the transfer function

)2()1(

713124)( 2

23

zz

zzzzT

Determine the state model of the system in (a) Phase variable form (b) Jordan canonical form.

———————–––

(DEC 312)


(Examination at the end of Third Year) Electronics and Communications

Paper II — Electronic Circuits II




1. (a) List out the advantages of negative feedback amplifier.

(b) Define tuned amplifier.

(c) What is chopper amplifier?

(d) Explain UPS.

(e) Write the frequency formula for the Collpitt's oscillator.

(f) Differences between Hartly and Collpits oscillator.

(g) Write the principle of oscillator.

(h) Discuss the effect of negative feed back on distortion.

(DEC 312) 2

(i) List out the advantages of class-A Amplifier.

(j) Write the different topologies.

(k) Classify voltage regulators.

(l) Advantages of FET.

(m) Compare the class B and class C power amplifier.

(n) Classifications of power amplifier.

(o) What is Harmonic distortion?

UNIT I

2. (a) Draw and explain complementary symmetry push-pull amplifier.

(b) Discuss class-B power amplifier and calculate its overall efficiency.

Or

3. (a) Draw and explain of class-A push-pull power amplifier.

(b) Explain harmonic distortion in amplifier.

UNIT II

4. (a) Explain a feedback amplifier with the help of a block diagram.

(b) Write the merits and demerits of negative feedback amplifiers.

Or

(DEC 312) 3

5. (a) Explain about crystal oscillators.

(b) Describe partly oscillator circuit and explain its action.

UNIT III

6. (a) Draw the circuit diagram for single tuned amplifier and explain it.

(b) Difference between the single tuned and double tuned amplifier.

Or

7. (a) Explain about transistor as a chopper switch.

(b) Explain about balanced chooper. And also write the advantages and disadvantages.

UNIT IV

8. (a) Draw a neat circuit diagram of a series regulator and explain its working.

(b) Explain about protectar techniques.

Or

9. (a) Comparison of shunt and series regulators.

(b) Explain about switching mode power supply.

———————–––

(DEC 313)


(Examination at the end of Third Year Third Semester)

Electronics and Communications

Paper III — COMPUTER ORGANISATION




1. (a) What is the use of Register Transfer Language (RTL)?

(b) What is micro operation?

(c) Compare isolated I/O and memory mapped I/O.

(d) What is control memory?

(e) What is multiprogramming?

(f) Define RISC.

(g) What are the formats of an instruction?

(h) Define Anociative memory.

(DEC 313) 2

(i) Write short notes on memory management hardware.

(j) What is memory hierarchy?

(k) Define DMA.

(l) What is the purpose of serial communication?

(m) Explain cache memory.

(n) What is address sequencing?

(o) What is instruction?

UNIT I

2. (a) Explain instruction cycle in detail.

(b) What is Bus and memory transfer.

Or

3. (a) What is an interrupt? Explain I/O interrupts.

(b) Explain Arithmetic logic shift unit with a diagram.

UNIT II

4. (a) Explain control memory.

(b) Explain various addressing modes.

Or

(DEC 313) 3

5. (a) Explain the instruction formats of CPU.

(b) Explain the operation of a micro programmed control unit.

UNIT III

6. (a) Discuss IEEE standard for floating point numbers.

(b) Explain the cache with two way set anociative addressing.

Or

7. (a) Multiple decimal-5 by decimal-6 using booth's algorithm.

(b) Explain auxiliary memory and virtual memory.

UNIT IV

8. (a) Design parallel priority interrupt hardware for a system with eight interrupt sources.

(b) Explain clearly how peripheral devices are interfaced to the computer system.

Or

(DEC 313) 4

9. (a) Explain the various steps involved in

asynchronous data transfer.

(b) Discuss various issues of serial

communication.

–––––––––––

(DEC 314) B.Tech. DEGREE EXAMINATION, DECEMBER 2011.



Paper IV — PULSE CIRCUITS


Answer Question No. 1 is compulsorily. (15 1 = 15)

Answer ONE question from each Unit.

(4 15 = 60)

1. (a) Sketch the output response of RC high pass circuit for a pulse input.

(b) Write the condition for good differentiator.

(c) What is the condition for compensated attenuator?

(d) Write the condition for ringing.

(e) Draw the transfer characteristics of two level chipper.

(f) State the clamping circuits theorem.

(g) What is the selection of R in clipping circuits?

(h) Define stable state.

(DEC 314) 2

(i) What is another name for bistable multivibrator?

(j) Write one application of Schmitt trigger.

(k) What is the expression for time period of an astable multivibrator?

(l) Define sweep speed error.

(m) Define restoration time.

(n) Why Bootstrap sweep circuit is called so?

(o) Write the expression for pulse width of triggered transistor blocking oscillator with base timing.

UNIT I

2. (a) Draw the output response of RC high pass circuit for a ramp input at different time constants and also obtain the output expression.

(b) What is ringing circuit? Explain the behaviour it at different damping conditions.

Or

3. (a) Obtain the output voltage expression of RC low pass circuit for a square wave input.

(b) Explain about RC low pass circuit as integrator. Also obtain the condition for good integrator.

(DEC 314) 3

UNIT II

4. (a) Draw the circuit diagram for negative peak differ and explain its working with the help of waveforms and transfer characteristics.

(b) Explain the switching behaviour of a transistor in detail.

Or

5. (a) Discuss about positive damper with neat diagrams.

(b) Define various switching time of a transistor with neat waveform.

UNIT III

6. (a) Draw the Schmitt trigger circuit and explain its working.

(b) What is the need for commutating capacitors? Explain various times encountered with commutating capacitors.

Or

(DEC 314) 4

7. (a) Discuss about unsymmetrical triggering method of binary.

(b) Draw the monostable multivibrator and explain its working with the help of neat waveforms.

UNIT IV

8. (a) What is sweep circuit? Discuss about various types of sweep circuits.

(b) Draw the circuit of triggered transistor blocking oscillator and explain its working.

Or

9. (a) Discuss about exponential sweep circuit and obtain expression for sweep speed error.

(b) Sketch the simple current sweep circuit and explain its operation with neat waveforms.

—————————

(DEC 315)




Paper V — OOPS & OS




1. Write brief notes on :

(a) Define Token.

(b) Define object.

(c) Define basic data type.

(d) Define Abstraction.

(e) Define encapsulation.

(f) Define output operator.

(g) Define a keyword.

(h) Define constructor.

(i) Define function.

(DEC 315) 2

(j) Define process.

(k) Define operating system.

(l) Define thread.

(m) Define Algorithm.

(n) Define Frame.

(o) Define system call.

UNIT I

2. (a) Explain various applications of OOP.

(b) Explain the Hierarchy of C++ data types.

Or

(c) Explain about user defined data types.

(d) Explain about scope resolution operator.

UNIT II

3. (a) Explain the concept of call by reference with suitable example.

(b) Explain about function overloading.

Or

(c) Explain about static member function with an example.

(d) Explain about friendly functions.

(DEC 315) 3

UNIT III

4. (a) Explain the concept process scheduling.

(b) Explain the concept of Threads.

Or

(c) Explain about Red Time scheduling.

(d) Discuss about Inter Process Communication.

UNIT IV

5. (a) Explain about continuous allocation in operating systems.

(b) Explain about segmentation with paging.

Or

(c) Explain about demand segmentation.

(d) Discuss about thrashing.

–––––––––––

(DEC 316)

B. Tech. DEGREE EXAMINATION, DECEMBER 2011.


Electronics and Communication Engineering

Paper VI — ANALOG COMMUNICATION




1. Write brief note about the following :

(a) What is synchronous detector?

(b) What is the total power in conventional AM?

(c) Write any two disadvantages of frequency discrimination method.

(d) How VSB is advantages than SSB?

(e) What are the different angle modulation schemes?

(f) What is Carson's rule?

(g) Draw the pre-emphasis diagram.

(h) What is the figure of merit value of SSB-SC?

(DEC 316) 2

(i) Define sampling theorem.

(j) What is the importance of limiter is FM?

(k) What is meant by AM threshold effect?

(l) What is white noise?

(m) Define guard band.

(n) What is PPM?

(o) What are the frequency components of an AM signal?

UNIT I

2. (a) Draw the time domain and frequency domain signals of an AM wave with necessary expressions.

(b) Explain about square law detector.

Or

3. (a) Discuss the generation of DSB-SC wave using balanced modulator.

(b) Explain the operation of switching modulator.

(DEC 316) 3

UNIT II

4. (a) Compare all AM techniques.

(b) Explain the detection of VSB. wave.

Or

5. (a) Discuss about FDM.

(b) Explain the generation of SSB wave.

UNIT III

6. (a) Explain the operation of FM demodulator

using PLL.

(b) Derive the expression for a single tone FM

wave.

Or

7. Explain the generation of FM wave using

Armstrong method.

UNIT IV

8. (a) Compare PAM, PPM, and PWM.

(b) Explain about FM threshold.

Or

(DEC 316) 4

9. (a) Discuss about the generation of PAM signal.

(b) Explain noise in AM system using envelop detector.

——————————

(DEC 321)




Paper I – LINEAR INTEGRATED CIRCUITS AND APPLICATIONS




1. (a) Define operational amplifier.

(b) Define slew rate.

(c) What is the gain expression for noninverting amplifier with feedback?

(d) Which type of feedback is used in inverting amplifier?

(e) What is the principle of oscillations?

(f) Sketch the Schmitt trigger circuit.

(g) What is voltage limiter?

(h) How do you get triangular waveform?

(DEC 321) 2

(i) What is negative clamping?

(j) What are the disadvantages of weighted resistor DAC?

(k) Define resolution of ADC.

(l) What is pin 6 of 555 timer?

(m) What is the function of VCO?

(n) Write the expression for pulse width of monostable multi using 555 timer.

(o) What is notch filter?

UNIT I

2. (a) Draw the circuit of instrumentation amplifier and explain various applications of it.

(b) Discuss about frequency compensation techniques used in OP-amps.

Or

3. (a) Explain voltage to current conversion with neat diagram and obtain its expression.

(b) Draw the circuit of differentiator and obtain expression for output voltage.

(DEC 321) 3

UNIT II

4. (a) Explain wein bridge oscillator principle with neat diagram and desire the expression for frequency of oscillations.

(b) Draw the circuit of comparator in inverting and noninverting modes and explain its working with the help of waveforms.

Or

5. (a) Discuss about voltage controlled oscillator.

(b) Draw the circuit of zero crossing detector and explain its working with relevant waveforms.

UNIT III

6. (a) Draw the circuit of sample and hold and explain its operation along with waveforms.

(b) Explain about weighted registor D/A converter and obtain expression for output voltage.

Or

7. (a) Discuss about positive and negative clippers.

(b) Explain the differences between dual slope and tracking A/D converters.

(DEC 321) 4

UNIT IV

8. (a) Derive the expression for frequency of astable multivibrator using 555 timer.

(b) Explain about IC723 voltage regulator.

Or

9. (a) Draw the PLL circuit as frequency multiplier and explain its working.

(b) Discuss about various active filters with their frequency responses.

————————

(DEC 322)




Paper II — MICROPROCESSORS AND INTERFACING

Time : Three hours Maximum : 75 marks Answer Question No. 1 Compulsorily.

(15 1 = 15) Answer ONE question from each Unit.

(4 15 = 60) 1. (a) List out register set of 8086 microprocessor.

(b) Give the flag structure of 8086

microprocessor.

(c) What is the significance of memory

segmentation.

(d) Define stack.

(e) What is meant by assembler and give

different types of assemblers.

(f) Explain LEA instruction.

(g) What is the different between CALL and

JUMP instructions?

(DEC 322) 2

(h) Define procedure.

(i) Differentiate between fixed port and variable port addressing.

(j) What is the significance of BHE pin in

8086 microprocessor.

(k) Define ISR.

(l) What is the difference between NMI and INTR interrupts.

(m) Generate control world in 8255 to set PC7.

(n) Calculate the output analog voltage obtained by DAC give that Iref =2mA and R=5.6k data is 11000011.

(o) What is the difference between synchronous and Asynchronous communication.

UNIT I

2. (a) Draw and explain the internal architecture of 8086.

(b) Explain different types of segments in 8086.

Or

(c) Explain different types of addressing modes.

(d) Classify the instruction set of 8086 and explain.

(DEC 322) 3

UNIT II

3. (a) Design the machine codes for the following instructions. (i) XORAL, AL (ii) AND AX, BX.

(b) Write a program that subtracts two double words and stores the result in memory.

Or

(c) Write a program to search for a word in a block of N words.

(d) Explain the action of the following instructions (i) AAM (ii) AAS.

UNIT III

4. (a) Explain the sequence of actions that occur in an interrupt acknowledge cycle.

(b) Explain the modes of operation of PPI.

Or

(c) Explain R-2R ladder digital to analog converter.

(d) Draw and explain the interfacing diagram to interface an analog to digital converter to 8086.

(DEC 322) 4

UNIT IV

5. (a) Draw and explain the functional block diagram of 8259.

(b) Explain any three modes of 8254.

Or

(c) Explain DMA data transfer.

(d) Draw and explain internal block diagram of 8251.

———————

(DEC 323) B.Tech. DEGREE EXAMINATION, DECEMBER 2011.



Paper III — DIGITAL SIGNAL PROCESSING




1. (a) State the stability using 3-transform.

(b) Draw the basic butterfly diagram of DIT algorithm.

(c) What is meant for region of convergence?

(d) What is meant by frequency warping?

(e) List the advantages of DSP.

(f) State the properties of DFT.

(g) What is zero padding?

(h) Distinguish between Butterworth and Chebyshev filter.

(i) Give expression for Blackmann and Barlett window.

(DEC 323) 2

(j) What are the features of Kaiser Window?

(k) What is an IIR filter?

(l) What is Gibb's phenomenon?

(m) What are the disadvantages of Fourier Series method?

(n) What is the condition for linear phase?

(o) Give two examples of antisymmetrical impulse response.

UNIT I

2. (a) Using real convolution theorem find the

inverse Z-transform of 2)1()(

zZ

zX .

(b) Determine the stability of the system

)1()()2()1(25

)( nxnxnynyny .

Or

3. (a) Check for linearity, time invariance, causality and stability for the following systems :

(i) )()( nxeny

(ii) )(ny = |)(|log10 nx .

(b) Find the convolution of the signal )4(*)( nunu .

(DEC 323) 3

UNIT II

4. An 8-point FFT is given by }2,2,2,2,1,1,1,1{)( nx compute 8 point DFT of

)(nx by

radix - 2 DIT FFT

radix - 2 DIF FFT

Also sketch magnitude and phase spectrum.

Or

5. (a) State and prove the Time reversal and Circular frequency shift property of DFT.

(b) Given nnx )2()( and N = 4. Find )(KX using DIT-FFT.

UNIT III

6. (a) The specifications of the desired low pass filter is

wwH

wwH

5.0;8.0|)(|

3.00;0.1|)(|2

1

Design a Butterworth filter using bilinear transformation.

(b) Design a Chebyshev filter with a maximum pass band attenuation of 2.5 dB at

20p rad/sec and the stop band

attenuation of 30 dB at 50s rad/sec.

Or

(DEC 323) 4

7. (a) Design a type - I Chebyshev LPF for following fpass = 1 KHz, fstop = 3 KHz, p = –

2dB, s = –14 dB and sampling frequency

sf = 10 KHz.

(b) Design a butterworth filter using the impulse invariance method for the following :

2.001|)(|8.0 wwH

wwH 6.02.0|)(|

Implement this using parallel form structure.

UNIT IV 8. (a) Distinguish between IIR and FIR filter. (b) Calculate the phase delay and group delay

the FIR filter determined by )2(25.0)1()(25.0)( nxnxnxny

Or 9. (a) What are the important properties of linear

phase filters? (b) Give the design procedure for FIR filter

design by windowing technique. (c) Design low pass filter with parallel

coefficients for the following specifications : Passband frequency edge = 0.25 KHz and Sampling frequency of 1 KHz. Use Hamming

window in design.

———————

(DEC 324)




Paper IV — ELECTRONIC MEASUREMENTS AND INSTRUMENTATION




1. (a) Define accuracy and sensitivity.

(b) Name the categories of static errors.

(c) What is meant by Gage factor?

(d) Draw the Maxwell Bridge, write balance

Equation.

(e) Draw the series type ohm meter.

(f) Define quantizing error.

(g) Draw the diagram of AC voltmeter.

(DEC 324) 2

(h) What are the thermistors?

(i) Where is LVDT used.

(j) What are resolvers?

(k) Write any two applications of DAS.

(l) Define multiplexing.

(m) Write any two principles of Electromyograph.

(n) What is piezo electric effect?

(o) What is principle of CRO?

UNIT I

2. (a) Explain in detailed about AC and DC voltmeters.

(b) Write the differences between series and shunt type ohmmeter with diagrams.

Or

3. (a) Derive the equation to find out the unknown capacitance using schering bridge.

(b) Explain different types of errors occurred in measurements and what are the precautions to be taken.

(DEC 324) 3

UNIT II

4. (a) Describe the Q-meter and their applications.

(b) Explain storage oscilloscope with neat sketch.

Or

5. (a) Draw the basic block diagram of CRO and explain about each block.

(b) Draw the successive approximation method and explain with a diagram.

UNIT III

6. (a) Write technical details on :

(i) Strain gauge

(ii) LVDT

(iii) Piezoelectric transducer.

(b) Define strain gauge and what are the different types of strain gauges.

Or

7. (a) Compare and contrast RTD and thermistor for usage of temperature measurement.

(b) What is a Thermo Couple? Explain its constructional details and measurement procedure.

(DEC 324) 4

UNIT IV

8. (a) How data acquisition system incorporated?

(b) Explain Electrocephalograph.

Or

9. (a) What are the different digital recording techniques?

(b) Explain the principles of Electrocardiograph.

———————

(DEC 325)




Paper V — DIGITAL COMMUNICATIONS


All questions carry equal marks.



1. Write short notes on :

(a) Define PCM

(b) Discuss the noise effect in PCM.

(c) What is entropy?

(d) Define syndrome.

(e) Write the procedure for Shanon-Fano coding.

(f) Explain inter symbol interference.

(g) What is mutual information?

(h) Write the properties of hamming-code.

(i) What is delta modulation?

(j) What is quantization noise.

(DEC 325) 2

(k) Explain binary cyclic codes.

(l) Compare PCM and DPCM.

(m) What are the advantages of convolution codes?

(n) What is systematic code?

(o) Define granular noise.

UNIT I

2. (a) Explain data modulation scheme.

(b) The input of a PCM and DM is a sine wave of 4 khz, PCM and DM are designed to yield an output SNR of 30 dB. Assuming PCM sampling at 5 times the Nyquist rate, Compare the band widths required for each system.

Or

3. (a) Explain about Duo-binary signalling scheme.

(b) Discuss about DPCM.

UNIT II

4. (a) Explain about generation and detection of QPSK.

(b) Derive the expressions for the probability of bit error in a non-coherent PSK system and compare it with a coherent PSK system.

Or

(DEC 325) 3

5. (a) Explain the signal space representation of QPSK signal.

(b) Compare the error probabilities of all digital modulation schemes.

UNIT III

6. (a) Explain error detection and correction capabilities of flamming codes.

(b) Write a short notes on :

(i) Source coding theorem

(ii) Information capacity theorem.

Or

7. (a) Prove the following :

I (X; Y) = H(X) + H(Y) - H(X, Y)

(b) Discuss about non-uniqueness of Huffmann coding with suitable examples.

UNIT IV

8. (a) The generator matrix for a (6, 3) block code is given below. Find all code vectors of this code.

011:100101:010

110:001

G

(b) Explain the algebraic structure of cyclic codes.

Or

(DEC 325) 4

9. A rate 31 convolution encoder has generating vectors as )111(,100( 21 gg and )101(3 g

(a) Sketch the encoder configuration.

(b) Draw the code tree, state diagram and trellis diagram.

(c) If input message sequence is 10110, determine the output sequence of the encoder.

———————–––

(DEC 326)



Electronics and Communication Engineering

Paper VI — COMMUNICATION SYSTEMS




1. (a) Define Selectivity.

(b) Classify Time Division switching.

(c) Define DTH.

(d) Define negative modulation.

(e) What is NTSC?

(f) Mention the range of UHF.

(g) What is the purpose of AGC circuit?

(h) Draw the three stage network of a telecommunication system.

(i) What is gamma correction?

(DEC 326) 2

(j) Write the differences between SPC and distributed SPC.

(k) What are the features of EHT supply?

(l) State Carson's rule.

(m) Define fading.

(n) Write the commercial TV broadcasting standards.

(o) What is diversity reception?

UNIT I

2. (a) Explain the operation of communication receiver.

(b) Explain the factors influencing the choice of IF.

Or

3. (a) Discuss about the operation of an FM receiver.

(b) Draw the block diagram of AM transmitter and explain.

UNIT II

4. (a) Discuss about cross bar switch.

(b) Explain about n-stage combination switching.

Or

(DEC 326) 3

5. (a) Explain briefly about simple telephone

communication.

(b) Discuss about electronic space division

switching.

UNIT III

6. (a) Explain in brief about ‘‘Interlaced Scanning’’

used in television systems.

(b) What is VSB transmission?

Or

7. (a) Explain about composite video signal.

(b) Discuss about the principle of operation of

image orthicon.

UNIT IV

8. (a) Write the differences between NTSC and

PAL systems.

(b) Explain about the generation of Luminance

Signal.

Or

(DEC 326) 4

9. Write a short notes on :

(a) DTH

(b) Cable television.

–––––––––––

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