Electronics and Communication Engineering - Exam Questions Papers

1. 

Following state diagram shows clocked sequential circuit:

How many states the sequential circuit has?

A. 6
B. 7
C. 5
D. 4

Answer: Option C

Explanation:

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2. 

Which of the following oscillators is used for the generation of high frequencies?

A. R-C phase shift oscillator
B. Wien bridge oscillator
C. L-C oscillator
D. Blocking oscillator

Answer: Option C

Explanation:

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3. 

Which of the following meters cannot measure a.c. quantities?

A. Thermocouple
B. Hot wire
C. P.M.M.C.
D. Electrodynamometer.

Answer: Option C

Explanation:

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4. 

For the circuit shown in the figure, D has a transition from 0 to 1 after CLK changes from 1 to 0. Assume gate delays to be negligible

Which of the following statements is true?

A. Q goes to 1 to the CLK transition and stays at 1
B. Q goes to 0 at the CLK transition and stays at 10
C. Q goes to 1 at the CLK transition and goes to 0 when D goes to 1
D. Q goes to 0 at the CLK transition and goes to 1 when D goes to 1

Answer: Option C

Explanation:

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5. 

What is the major cause of creeping in an energy-meter?

A. Over compensation for friction
B. Mechanical vibrations
C. Excessive voltage across the potential coil
D. Stray magnetic fields

Answer: Option A

Explanation:

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