Electronics and Communication Engineering - Analog Electronics

31. 

Transformer coupling in transistor amplifier circuits provides high efficiency, because

A. d.c. resistance is low
B. collector voltage is stepped up
C. flux linkages are incomplete
D. all of the above

Answer: Option A

Explanation:

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32. 

Two identical FETs each having parameters gm and rd are connected is parallel. The composite FET has parameters

A. 0.5 gm and 2 rd
B. 0.5 gm and 0.5 rd
C. 2 gm and 2 rd
D. 2 gm and 0.5 rd

Answer: Option D

Explanation:

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33. 

If f is more than funity the gain of op-amp becomes less than 1.

A. True
B. False

Answer: Option A

Explanation:

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34. 

For an amplifier the input output signals are shown in figure. The class of amplifier is

A. A
B. AB
C. B
D. C

Answer: Option D

Explanation:

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35. 

In a N-P-N transistor the function of the emitter is

A. to emit or inject holes into the collector
B. to emit or inject electrons into the collector
C. to emit or inject electrons into the base
D. to emit or inject holes into the base

Answer: Option C

Explanation:

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