Amplifiers – Exercise – 1

26. When voltage feedback (negative) is applied to an amplifier, its input impedance …….

(a) is decreased
(b) is increased
(c) remains the same
(d) none of the above

Answer
Answer : (b)
Explanation
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27. When current feedback (negative) is applied to an amplifier, its input impedance ………

(a) is decreased
(b) is increased
(c) remains the same
(d) none of the above

Answer
Answer : (a)
Explanation
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28. Negative feedback is employed in …….

(a) oscillators
(b) rectifiers
(c) amplifiers
(d) none of the above

Answer
Answer : (c)
Explanation
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29. Emitter follower is used for ……..

(a) current gain
(b) impedance matching
(c) voltage gain
(d) none of the above

Answer
Answer : (b)
Explanation
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30. The voltage gain of an emitter follower is …

(a) much less than 1
(b) approximately equal to 1
(c) greater than 1
(d) none of the above

Answer
Answer : (b)
Explanation
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