Electronics and Communication Engineering - Analog Electronics

21. 

Negative feedback is used in audio amplifiers to

A. operate class C
B. reduce distortion
C. increase distortion
D. increase gain

Answer: Option B

Explanation:

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22. 

A BJT amplifier has a power gain of 0.5 from source to base. The power gain in dB is

A. -0.3 dB
B. -3 dB
C. -6 dB
D. -10 dB

Answer: Option B

Explanation:

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23. 

A rectifier circuit has load resistance R. It uses a capacitance filter having capacitance C. For low ripple in the output

A. RC should be 1
B. RC should be low
C. RC should be high
D. RC should be neither low nor high

Answer: Option C

Explanation:

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24. 

In graphical analysis of BJT amplifier the slope of ac line is more than that of dc load line.

A. True
B. False

Answer: Option A

Explanation:

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25. 

Which circuit is called emitter follower?

A. CC
B. CE
C. CB
D. Both (a) and (b)

Answer: Option A

Explanation:

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