Amplifiers – 1 – 6

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

EXPLANATION

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

EXPLANATION

28. Negative feedback is employed in …….

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

ANSWER

EXPLANATION

29. Emitter follower is used for ……..

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

ANSWER

EXPLANATION

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

EXPLANATION

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