III YR -EC - Anucde Peak Overshoot (M p) d) Settling Time (T s) UNIT - III 6) Briefly explain the steps of Root locus concept with an suitable example. (OR) 7) Explain Bodeplot and

(DEC311)

B.Tech. DEGREE EXAMINATION, NOV/ DEC 2014

(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 asymptotic stability?

f) Explain the relationship between damping radio and percentage overshoot.

g) What is meant by term “magnitude criterion in root locus technique?”

h) What is meant by relative stability?

i) Define transfer function?

j) What are the time domain specifications?

k) State the characteristics of linear systems.

l) What are the properties and limitations of transfer function of a system?

m) Define peak overshoot.

n) What is a system?

o) Define state of a system.

UNIT - I

2) Explain the following feed back control systems

a) Linear control system

b) Non linear control systems

c) Discrete data control systems.

d) Time invariant versus Time-varying systems.

e) Continuous – Data control systems

(OR)

3) Explain signal flow graph and Mason’s gain formula with an examples.

UNIT – II

4) Explain the following Test signals with an example

a) Step function

b) Ramp function

c) Parabolic function

d) Impulse function

e) Sinusoidal function

(OR)

5) Derive the following Time response specifications.

a) Rise Time (Tr)

b) Peak Time (Tp)

c) Peak Overshoot (Mp)

d) Settling Time (Ts)

UNIT - III

6) Briefly explain the steps of Root locus concept with an suitable example.

(OR)

7) Explain Bodeplot and Nyquist Plot with an example.

UNIT - IV

8) Design the procedure of las-lead compensator with steps and by considering an suitable

example.

(OR)

9) a) Explain the significance of “state Transition matrix.”

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

� � �

(DEC312)

B.Tech. DEGREE EXAMINATION, NOV/ DEC 2014

(Examination at the end of Third Year)

ELECTRONICs & COMMUNICATIONS

Paper - II : Electronic Circuits - II


Answer Question No.1 is compulsory (15)

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

1) a) Give the properties of negative feedback.

b) Define sensitivity.

c) What is the expression for resonant frequency.

d) What is Q factor.

e) What do you mean by dissipation factor.

f) List the efficiencies of all Power amplifier (A,B&C)

g) Define Barhausen Criterion.

h) What do you mean by Piezo electric effect.

UNIT - I

2) a) Derive the equation for efficiency in class B push-pull amplifier.

b) Discuss in detail about phase inverters.

(OR)

3) a) Explain why power transistors are provided with heat sinks.

b) In a class A amplifier VCE (max) is 15V, VCE (min) = 1V find the overall efficiency for

series fed load and transformer Coupled load.

UNIT – II

4) a) Explain current series feedback amplifier.

b) Draw the Circuit diagram, Input and output waveforms of a RC phase shift oscillator

and explain its working.

(OR)

5) a) Write short notes on frequency stability criterion for oscillators.

b) Explain Hartley oscillator and device the equation for oscillation.

UNIT - III

6) a) Draw a neat circuit and explain the operation of a Double tuned transformer Coupled

amplifier

b) Derive chopper transients.

(OR)

7) a) Explain the operation of a stagger tuned amplifier.

b) Show that a FET functions as a chopper.

UNIT - IV

8) a) What is an VPS? How does it work.

b) Describe the operation of a transistorised series regulator.

(OR)

9) a) Explain the features of a overload protection circuit and draw its neat figure.

b) Describe the operation of a shunt regulator.

� � �

(DEC313)

B. Tech. DEGREE EXAMINATION, NOV./DEC. – 2014

Third Year


Paper - III : Computer Organization

Time : 3 Hours Maximum Marks : 75


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

1) Explain the following terms:

a) DATABASE

b) E-R Model

c) EER Model

d) Concurrency

e) Normalization

UNIT – I

2) Explain with example the implementation of register transfer?

OR

3) Discuss in detail about various arithmetic operations.

UNIT - II

4) What is an instruction code? Explain in detail various addressing modes.

OR

5) Explain about interrupt priorities?

UNIT - III

6) Explain with neat diagram, the address selection for control memory.

OR

7) Explain the database system architecture using a simple example and diagram.

UNIT - IV

8) Explain about asynchronous data transfer and asynchronous communication interface.

OR

9) Explain about input output interface.

��

(DEC314)


(Third Year)

ELECTRONICS AND COMMUNICATIONS

Paper – IV : Pulse Circuits


Answer question No.1 is compulsory (15)


1) a) What does collector catching diodes mean?

b) When a diode is said to be breakaway diode?

c) Prove clamping circuit theorem?

d) Explain the operation of basic double ended clipper with circuit diagram?

e) Write down the use(s) of ringing circuit?

f) What is the need of commutating capacitor?

g) Explain sweep speed and linearity of bootstrap time base generator?

h) Express rise time of blocking oscillator?

i) Explain the meaning of term nonlinear waveshaping?

j) What is the relation between reactance and resistance of the RC high-pass filter at its

lower 3dB frequency f1?

UNIT - I

2) a) Explain the operation of RC low pass circuit with ramp input with circuit

diagram?

b) Prove that the area under the pulse is same as the area under the output waveform

across the capacitor for a low pass RC circuit, with a pulse input?

OR

3) a) Explain the operation of ringing circuit with help of circuit diagram?

b) A10Hz square wave is fed to an amplifier. Calculate and plot the output waveform

under the following conditions. The lower 3dB frequency is: (i) 0.3Hz (ii) 3Hz (iii)

30Hz?

UNIT - II

4) a) Explain the operation of clamping circuit taking source and diode resistances into

account?

b) Explain steady state output for a square wave input of a clamping circuit ?

OR

5) a) Explain how transistor acts as a switch? Design transistor switch capacitive load?

b) Explain the operation of a double diode clipper with help of circuit diagram and

waveforms?

UNIT – III

6) a) Design collector coupled Monostable Multivibrator and explain its operation with

help of circuit diagram and waveforms?

b) Design the Astable Multivibrator to generate 5kHz square wave. The supply voltage

Vcc =10V, Ic(sat) = 10mA, hfe =50. Assume silicon transistor?

OR

7) a) Design Schmitt trigger. Explain its operation with help of circuit diagram and

waveforms?

b) Find the voltages and currents in the direct coupled bistable Multivibrator if

Vcc = 10V and Rc=4K. Calculate output swing.

UNIT – IV

8) a) Explain the operation of a current sweep circuit with help of circuit diagram and

waveforms?

b) Design a free running UTP sweep waveforms generator with the sweep

amplitude of 6V. The sweep interval of the waveform is expected to be 3 ms with

negligible retrace interval. The slope error is 0.75. Determine the values of Rb1, Rb2,

VBB, V, R and C?

OR

9) a) Describe an operation of triggered transistor blocking oscillator with emitter timing

with circuit diagram and obtain an expression for the pulse width?

b) List out the applications of blocking oscillator?

,

��

(DEC315)




Paper - V : OOPS & OS


Question No.1 is compulsory (15)


1) Explain the following terms:

a) Compiling and linking.

b) Red -Time scheduling

c) Page Replacement algorithm.

UNIT – I

2) Briefly explain about Tokens, Keywords, Basic data types and user defined data types.

OR

3) Explain in detail about the specification of a class and defining member functions with an

example.

UNIT – II

4) Explain with an example how do you specify a class and define member functions.

OR

5) What is function overloading? How does the fiend functions virtual functions work.

UNIT – III

6) Define thread and explain in detail how the inter process communication takes place.

OR

7) What is a process and what are the process concepts.

UNIT – IV

8) Explain the purpose of Demand paging and page replacement algorithm.

OR

9) Distinguish between logical Vs Physical address space.

��

(DEC 316)

B.Tech. DEGREE EXAMINATION, NOV./DEC. – 2014



Paper - VI : Analog Communication



Answer one questions from each unit (4×15 = 60)

1) a) Give 4 differences between PAM and PWM.

b) Define Modulation index.

c) Give significance of PLL.

d) What is Carson’s rule?

e) What is demodulation?

f) Define AM and PM.

g) Give applications of FM limiters.

h) What is the difference between SSB and DSB?

UNIT - I

2) a) Explain Square Law modular for Generation of AM wave.

b) Explain the generation of DSB-SC waves using Balanced modulator.

OR

3) a) List the advantages of DSB-SC modulation and explain its generation using Costas

loop.

b) Explain the working of a switching modulator.

UNIT - II

4) a) Write short notes on complex envelope and Natural envelope.

b) Explain generation of VSB modulated wave.

OR

5) a) Explain generation of SSB-SC wave using frequency discrimination method.

b) Explain envelope detection of VSB wave plus carrier.

UNIT - III

6) a) Obtain the relation between FM and PM.

b) Write short notes on FM limiters.

OR

7) a) Compare NBFM and WBFM.

b) Explain generation of FM waves using Armstrong method.

UNIT - IV

8) a) Draw a block diagram and explain generation and demodulation of PAM.

b) Explain Noise in FM reception.

OR

9) a) Write short notes on Noise in AM receivers.

b) Explain Threshold effect and FM Threshold reduction.

� � �

(DEC 321)


(Examination at the end of Third Year Fourth Semester)


Paper - I : Linear Integrated Circuits and Applicat ions



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

1) a) Why Butterworth filters are preferred over chebhyshev filters?

b) Define common mode signal & Differential signal and which is preferred in OP-

AMP.

c) Differentiate positive feedback and negative feedback.

d) Mention temperature ranges of an OP-AMP IC.

e) Which type of feedback is preferred in oscillators? justify your answer?

f) Applications of comparator.

g) Where sample and hold circuits are preferred explain?

h) Purpose of PIN ‘4’ in 555 timer.

i) Characteristics of D/A converters.

j) Differentiate Bandpass & multiple feedback Bandpass filters.

k) Mention the VCO’s roll in PLL.

UNIT - I

2) Explain in detail the DC and AC characteristics of an OP-AMP with relevant

expressions.

OR

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

frequency from 10Hz to about 1kHz. Draw its output waveform if sin 2π × 1000t

signal is applied.

b) Discuss the functioning of a practical integrator and derive the necessary expression.

UNIT - II

4) a) Design a Sawtooth waveform generator using OP-AMP and plot the

waveforms for the given specifications frequency; 5KHz, Vsat = +15V(Assume

necessary data).

b) What is the difference between a basic comparator and the Schmitt Trigger?

Construct a Schmitt Trigger circuit using OP-AMP and derive the threshold voltages.

OR

5) a) Derive the frequency of oscillation of a RC phase shift oscillator and

explain the operation of the circuit.

b) Explain about:

i) Zero crossing detector.

ii) Window detector with the help of a circuit diagram.

UNIT - III

6) a) What is a clipper? With circuit diagram, explain the operation of positive and

negative clippers.

b) Draw the circuit of a Ladder type DAC for 4bits and derive expression for output

voltage.

c) Applications of Successive Approximation A/D converter.

OR

7) a) What is a Clamper? With circuit diagram, explain the operation of positive and

negative Clamping.

b) Give the schematic circuit of integrating type ADC and explain the

operation of this system and derive expression for output voltage VO.

UNIT - IV

8) a) How is an Astable multivibrator using 555 timer connected into a pulse position

modulator.

b) Design a PLL circuit using IC 565 to get

i) Free-running frequency = 4.5 kHz

ii) Lock range of 2 kHz and

iii) Capture range = 100Hz.

Assume a supply voltage of + or -10V. Show the ciruit diagram with all component

values.

OR

9) a) Design a wide band-pass filter with fL = 200Hz. FH = 1kHz and a pass band gain = 4.

Draw the frequency response and calculate ‘Q’ factor for the filter.

b) With the help of circuit diagram explain about 723 voltage regulator and its

applications.

� � �

(DEC 322)




Paper - II : Microprocessors and Interfacing



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

1) a) What is meant by a 8bit up and 16 bit up?

b) What is tristate logic?

c) What is a Flag and a stack pointer?

d) What are Software delays?

e) What is the purpose of Instruction queue?

f) What is the use of Lock in maximum mode?

g) What are the parts of Flag register?

h) What is the use of status signal S3 and S4?

UNIT - I

2) a) Write the differences between microcomputers and microprocessors.

b) Draw the pin diagram of 8086 and explain the function of pins.

OR

3) a) Explain the addressing modes of 8086.

b) Write a program to multiply the two 16bit numbers.

UNIT - II

4) a) Write a program to arrange given set of numbers in increasing mode.

b) Write short notes on Addressing memory and ports in microcomputer system.

OR

5) a) Write a ALP to Add two 16bit numbers.

b) Write a ALP to convert a Hexadecimal number to Binary.

UNIT - III

6) a) Explain 8086 interrupts.

b) Discuss A/D converter specifications.

OR

7) a) Explain interfacing a microprocessor to keyboard.

b) Explain D/A converter operation.

UNIT - IV

8) a) Differentiate minimum and maximum modes of 8086.

b) Draw the architure of 8253 and explain.

OR

9) a) Draw the logic block diagram of 8259 and explain.

b) What is RS232C? Give voltage levels and features of RS232C.

� � �

(DEC 323)




Paper - III : Digital Signal Processing




1) a) Define unit step response.

b) Define “Causal” system.

c) What do you mean by Shift of a sequence?

d) How is Signal addition is carried out?

e) List properties of Z-transforms.

f) Give two properties of DFT.

g) What is FFT?

h) What are the twiddle factors?

i) What is an IIR digital filter?

j) Define Down sampling.

k) What is ROC?

l) What is a ‘Window’?

m) Define a ‘Discrete System’.

n) What do you mean by a stable system?

o) List properties of DFS.

UNIT - I

2) a) Derive an expression for a Parseval’s relation for discrete time periodic signals.

b) Find inverse Z-transform of .

OR

3) a) Define causality and stability of LSI system and state the conditions for stability.

b) Determine Z-transform, ROC and pole – zero location of αnu(n).

UNIT - II

4) a) Prove x*(n) →x*{(-K)} NRN(K).

b) Define DFT of a sequence X(n). Obtain the relationship between DFT and DTFT.

OR

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

b) Distinguish between DFT and DTFT.

UNIT - III

6) a) Discuss magnitude characteristics of Digital Butterworth filter.

b) Compare Impulse invariance and Bilinear transformation methods.

OR

7) a) Find H(z) using impulse invariant method for given analog system

H(s) = 1/(S + 0.5) (S2 + 0.5S + 2).

b) Describe the IIR filter design approximation using Bilinear transformation method.

UNIT - IV

8) a) What are the advantages and disadvantages of FIR filters over IIR filters.

b) Explain with an example Realisation of Digital filter using Direct method.

OR

9) a) Show that an FIR filter is linear phase if h(n) = h(N-1-n).

b) Explain Generalized Hamming window.

� � �

(DEC 324)




Paper - IV : Electronic Measurements and Instrumentation




1) a) What do you mean by limiting error?

b) Give the range of Maxwell’s bridge.

c) List disadvantages of thermocouple.

d) What is Piezo electric effect?

e) List applications of thermistor.

f) Give applications of Q-meter.

g) Draw the circuit of Kelvin’s bridge.

UNIT - I

2) a) Explain the operation of a Hay bridge. Give its applications.

b) Discuss how calibration of DC instruments is done.

OR

3) a) With a neat circuit explain series type of ohmmeter.

b) Draw a neat sketch and explain Guarded wheatstone bridge. How does it differ from

wheatstone bridge.

UNIT - II

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

b) Draw a storage oscilloscope and list its applications and advantages.

OR

5) a) Discuss briefly universal counter.

b) Draw the Ramp digital voltmeter and explain its working.

UNIT - III

6) a) Explain the working of a Resistance strain gauge.

b) How is measurement done using a thermocouple? List its advantages.

OR

7) a) Explain the working of a LVDT.

b) Draw a neat figure of shaft encoder and explain its function.

UNIT - IV

8) a) Explain the method of Digital recording technique.

b) Give briefly the principle of ECG.

OR

9) Write short notes on:

a) EMG

b) Digital data acquisition system.

� � �

(DEC 325)




Paper - V : Digital Communications



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

1) a) A TV signal with a B.W. of 4.2 MHz is transmitted using PCM and the number of

quantization levels are 512. Find its transmission B.W.?

b) Define quantization error and its range in PCM.

c) Calculate the minimum B.W. for BPSK modulator with an input bitrate of 500 kHz?

d) Express B.W. in BFSK system.

e) What is the residual effect?

f) Calculate amount of information for probability of occurrence 0.25?

g) Explain hamming weight and hamming distance with example.

h) Clearly differentiate Block codes and Convolutional codes?

i) Write down the properties of mutual information.

j) How many sinc functions are needed in modified duo binary filter?

UNIT - I

2) a) Write down the principle involved in PCM. Draw the block diagram of PCM and

explain in detail about each block.

b) Derive the expression for signal to noise power ratio in DM.

OR

3) a) Define matched filter. List out properties of it. Derive expression for minimum error

probability of matched filter.

b) Explain the need for a precoder in a duobinary signaling? For input binary data

1011101 obtain the output of precoder and output of duobinary coder. Explain how

data can be detected at the receiver?

UNIT - II

4) a) Explain types of reception and requirements for passband transmission? List out the

advantages of passband transmission over baseband transmission.

b) Find the transmitted phase sequence for this Input binary sequence {bk} = {1, -1, 1, -

1, -1, -1, 1, 1} and sketch the transmitted waveforms for QPSK.

OR

5) a) Discuss the ambiguity in BPSK and explain how DPSK overcomes this ambiguity

with help of block diagram?

b) Derive the expression for Probability of error in BFSK.

UNIT - III

6) a) What is Entropy? Show that the Entropy is maximum when all the

messages are equi-probable with example?

b) Calculate efficiency for the following message ensemble using Huffman coding.

[X] = [x1x2 x3x4x5x6x7]

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

OR

7) a) Explain about discrete memoryless channels? Derive expression for

probability of error for discrete memoryless channels.

b) The voice frequency modulating signal of a PCM system is quantized in 16 levels

with the following probabilities; p1 = p2 = p3 = p4 = 0.1, p5 = p6 = p7 = p8 = 0.05, p9 =

p10 = p11 = p12 = 0.075, and p13 = p14 = p15 = p16 = 0.025. Calculate the entropy and

information rate. Assume fm = 3 kHz?

UNIT - IV

8) a) List out the conditions to define Linear block codes as Hamming codes? Discuss

error detection and correction capabilities of Hamming codes?

b) A binary sequence 1 0 0 1 is coded using a generator polynomial G(x) = x3 + x + 1.

Assuming a systematic cyclic coding is used, determine

i) length of the coded sequence.

ii) the transmitted codeword.

OR

9) a) List out the advantages and disadvantages of Block codes and

Convolutional codes.

b) A 1/3 rate convolution encoder has generating vectors as g1 = (1 0 0), g2 = (1 1 1), g3

= (1 0 1).

i) sketch the encoder configuration.

ii) Draw the code tree.

iii) Draw the state diagram.

iv) If input of the message is 1 0 1 1 0, determine the output sequence of the

encoder.

� � �

(DEC 326)




Paper - VI : Communication Systems




1) a) What is BW required for video signal transmission?

b) What is meant by selectivity?

c) What is meant by fidelity?

d) What is the use of frequency multiplier?

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 subscriber loop signaling?

j) Explain Halo effect?

k) Define Shading correction.

l) Explain the phenomena of Photoconductive lag.

m) Give the Significance of Chromacity Diagram.

n) What is color burst signal?

o) Define Depth of Field.

UNIT - I

2) a) Draw the block diagram of TRF receiver. Write its limitations.

b) 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.

OR

3) a) What is Delayed AGC, explain with the help of block diagram?

b) What is the necessity for Tracking in Radio Receivers? Explain with circuit Diagram.

UNIT - II

4) a) Explain the working of two stage combination stitching.

b) Discuss about phased operation and slotted operation in time division time switching.

OR

5) a) What is SPC? Discuss in detail about Distributed SPC.

b) Determine switch advantage ratio of a three stage network with N inlets and N outlets

for the cases when

i) N = 128 and

ii) N = 32768

UNIT - III

6) 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

7) a) Write down the Principle of operation, Explain the constructional details of

plumbicon with the help of block diagram.

b) Explain the need of pre and post equalizing pulses with schematics.

UNIT - IV

8) a) Explain the concept of additive mixing and subtractive 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

9) a) Explain PAL encoder with the help of block diagram.

b) Write short notes on DTH.

� � �

Documents

III YR -EC - Anucde Peak Overshoot (M p) d) Settling Time (T s) UNIT - III 6) Briefly explain the steps of Root locus concept with an suitable example. (OR) 7) Explain Bodeplot and