Electronics and Communication Engineering - Analog Electronics

16. 

Which one of the following power amplifier has the maximum efficiency?

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

Answer: Option D

Explanation:

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17. 

Figure shows small signal model of CB amplifier circuit. Then I and R are respectively equal to

A. a ie and re
B.
C. a ie and re (a - 1)
D. (a - 1) ie and re

Answer: Option A

Explanation:

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18. 

The common emitter short circuit current gain β of a transistor

A. is a monotonically increasing function of the collector current Ic
B. is a monotonically decreasing function of Ic
C. increasing with Ic, for low Ic, reaches a maximum and then decreases with further increase in Ic
D. is not a function of Ic

Answer: Option C

Explanation:

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19. 

A complementary symmetry amplifier has

A. 1 P-N-P and 1 N-P-N transistor
B. 2 P-N-P transistor
C. 2 N-P-N transistor
D. 2 P-channel FETs

Answer: Option A

Explanation:

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20. 

The units of are

A. V
B. V-1
C. J
D. J/K

Answer: Option B

Explanation:

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