www.drmgrdu.ac.in ECE PhD Entrance Exam Model Question Paper : Dr MGR University

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Dr.M.G.R Educational and Research Institute University
Department of Electronics and Communication Engineering
Model Question Paper
Entrance Examination for Ph.D Admission(March 2012)

Model Question List : http://www.drmgrdu.ac.in/Enterence%2...for%20Ph.D.htm
Model Question Paper : http://www.drmgrdu.ac.in/Enterence%2...ngineering.pdf

PART – A (10 X 1 = 10) MARKS
ANSWER ALL THE QUESTIONS

1. Reciprocity Theorem is used in Antennas. True/False.
2. The expression for Phase modulated wave is _________
3. 8085 processor has _________ flags.
(a)4 (b)6 (c) 5

4. Specify True (or) False: Lyapunov Stability criterion can be applied to nonlinear systems stability check.

5. Cross over distortion occurs in _______ power amplifier.
(a) Class A (b) Class AB (c) Class C

6. The expression for forward bias current in a PN diode is _________.

7. The maximum addressing capacity of 8086 processor is ______.

8. For a discrete system to be stable all the poles should lie ______ the unit circle.
(a)outside (b) inside (c) on

9. The sampling frequency for a 4kHz signal as per Sampling theorem is _______.

10. Implement a 2 input RTL NOR gate.

PART – B (6 x 5 = 30) MARKS
ANSWER Any six QUESTIONS

1. Draw the circuit of a 2nd order High pass filter using Op. Amp.

2. The impulse response of a system is Check the stability of the system for an impulse input.

3. Mention the important blocks of a multirate sampling system.

4. An 8085 program is given below. Specify the T states required for the different instructions specified.
STA 3200H
ADD B
MOV B, A
RLC
RLC
ADD B
RRC

5. Compare the transmitter power required for (i) AM (ii) AMDSB and (iii) AMSSB

6. In the context of Embedded Systems explain briefly (i) Deadlock (ii) Unrolling and (iii) Process

7. Write a VHDL program to implement a Gray to Binary Code converter.

8. Implement a 2:1 multiplexer circuit using CMOS transmission gates alone.

9. Design a 3 bit up counter using JK flip flops.

10. Explain with an example the following statement “uncorrelated random process does not imply that they are independent, however, if two random processes are independent then they are uncorrelated.

11. What is a Macro? Write a MACRO to implement a NOR gate function for an 8-bit processor.

12. Write a ‘C’ program to print the factorial of a given no.?