Electronics and Communication Engineering - Exam Questions Papers

31. 

Which of the following flip-flop is used as a latch?

A. J K flip-flop
B. R S flip-flop
C. T flip-flop
D. D flip-flop

Answer: Option D

Explanation:

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32. 

Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material?

A. Diaphragm
B. Capacitor
C. L.V.D.T.
D. Piezoelectric crystal.

Answer: Option B

Explanation:

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33. 

In closed loop control system, what is the sensitivity of the gain of the overall system, M to the variation in G?

A.
B.
C.
D.

Answer: Option A

Explanation:

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34. 

Ferromagnetic materials show hysteresis in B - H characteristic. As the magnetic field in increased slowly from zero value, what is the first process which sets the material to give net magnetization?

A. Growth of favourably oriented domains at the cost of other domains by reversible boundary displacements
B. Growth of favourably oriented domains at the cost of other domains by irreversible boundary displacements
C. Domain wall orientation
D. A combination of processes (a) and (c) above

Answer: Option D

Explanation:

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35. 

Which of the following is a microwave source with a 'cross-field' structure?

A. Double cavity klystron
B. Reflex klystron
C. Magnetron
D. Travelling wave tube

Answer: Option C

Explanation:

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