Interview Question Asked Interview Question for Electronics and Communication Engineering

ELECTRONICS AND COMMUNICATION

Digital electronics

1. Flip flop and their working. What is metastable state in flip-flops?
2. Construct a d flip-flop from a t flip-flop.Differentiate b/w flip-flop and latches
3. What is totem pole?
4. Draw the state graphs for a given problem like sequence generator, flip flop etc
5. Implement Boolean expressions using MUX (2 to 4,3 to 8,etc)
6. Design a decade counter
7. Explain internal organization of memory chips
8. What is a bit? What is CMOS? Draw the circuit of an adder using NAND gate
9. What is a Karnaugh map?
10. What are the four methods to reduce a Boolean?
11. What is the difference b/w half adder and full adder?
12. What are the advantages of CMOS and TTL?What technology is used in CMOS logic?What are VLSI and ULSI? What is the number of components in both?
13. Explain synchronous and asynchronous counter
14. Minimize the function using Quine McClusky:f=xy+x’y+yz+x’y’z’
15. What is prime implicant? Which is the universal flip-flop?
16. What is SRAM and DRAM? Compare the two, relative cost of the two.
17. What will happen in the case of a power failure for the above?
18. What is tristate or high impedance state?
19. What are the difference between open collector output and totem pole out put?
20. Find the highest clocking frequency of a digital circuit give the rise time ,fall time and propagation delay?

Electronic Devices & circuits

1. Obtain a square wave from sine wave from Zener diodes.
2. What is the difference between oscillator and multivibrator?
3. What is emitter follower? What is an opamp?
4. What is the ideal gain of an opamp?
5. How is amplification possible in a transistor?
6. Classify power amplifiers
7. How does a diode look(internally)? Explain the working using internal diagram
8. Explain processes taking place in the depletion junction of a forward biased diode
9. What is a buffer? What is the gain of a buffer?
10. What is an oscillator?
11. How do you forward bias a transistor?
12. What are the practical applications of a transistor?
13. What is reverse recovery time and how does it affect a diode?
14. Draw and explain the working of a monostable vibrator using op amp
15. State Thevenin’s theorem and Norton’s theorem. What are their applications?
16. What is the virtual ground in an op amp?
17. Differentiate between intrinsic and extrinsic semiconductor

Power Electronics

1. What is a thyristor and differentiate between thyristor and a diode
2. Switching action of an SCR and triggering. Draw the diagram of thyristor
3. Draw an internal block diagram of a normal voltage stabilizer
4. What is a reference variable?

Control Systems

1. Define control systems. Why are they so important?
2. What are the different types of control systems?
3. Explain open loop with block diagram examples
4. What are the advantages and drawbacks of closed loop?
5. How can you design a stable system? Explain different stability criteria
6. Explain Ruth-Hurwitz rule in one sentence. What are poles and their significance?
7. Is there any control system in this room(interview hall)?
8. Draw the block diagram of a control system and write its transfer function
9. What is ROC? Explain transformation between s and z planes
10. Differentiate between open and closed loop control systems
11. What is meant by adaptive control system?
12. Find the transfer function of a given RLC circuit

Communication

1. What is packet switching and circuit switching? What is the protocol used in telephone network?
2. What is modulation? Why is needed? What are the various types?Compare AM,FM, PM.Which waves will travel a longer distance- FM or AM and why?
3. What is the mode of transmission of television signals?
4. Compare the bandwidth requirements of AM and FM
5. What do you know about antennae?
6. Why is linking up frequency greater than the down linking frequency?

Modern trends and general questions

1. What is a modem? Draw its internal diagram
2. What is VoIP?
3. What is the most important advantage of Bluetooth?
4. What is wave studio? What is Bit rate?
5. What is the difference between mp3 and WAV formats?
6. What is sampling? What is a database? What is VHDL? What is a complier?
7. What is FSF? Cite any current relevance
8. Volume control in TV is logarithmic. Why?
9. What is the mathematics used in DSP and from which domain to which domain is it converted?
10. Differentiate between macros and functions in C .Explain the booting process of a computer.What is round robin technique of interrupt arbitration

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