Electronics and Communication Engineering - Analog Electronics

11. 

Which of the following circuits can operate class AB for audio power output?

A. Emitter follower
B. Push pull
C. Cascade
D. Darlington pair

Answer: Option D

Explanation:

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12. 

In a P-N-P transistor, with normal bias

A. the collector junction has negligible resistance
B. only holes cross the collector junction
C. the collector-base junction is reverse biased and the emitter base junction is forward biased
D. only majority carriers cross the collector junction

Answer: Option C

Explanation:

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13. 

If Rs is the sources resistance, the O/P resistance of an emitter follower using the simplified hybrid model would be

A.
B.
C.
D.

Answer: Option A

Explanation:

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14. 

A D.C. amplifier amplify

A. D.C. only
B. A.C. only
C. both A.C. and D.C.
D. none of the above.

Answer: Option A

Explanation:

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15. 

In common base amplifier the current gain is less than one, but the voltage gain may be anywhere from

A. 0.5 to 1
B. 1 to 5
C. 5 to 10
D. 50 to 2000

Answer: Option D

Explanation:

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