Amplifiers – 1 – 10

46. In an emitter follower, we employ …… negative current feedback

(a) 50%
(b) 25%
(c) 100%
(d) 75%

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

47. An amplifier has an open loop voltage gain of 1,00,000. With negative voltage feedback, the voltage gain is reduced to 100. What is the sacrifice factor ?

(a) 1000
(b) 100
(c) 5000
(d) none of the above

ANSWER
Answer : (a)

EXPLANATION
No answer description available for this question. Let us discuss.

48. In the above question, what will happen to circuit performance ?

(a) distortion is increased 1000 times
(b) input impedance is increased 1000 times
(c) output impedance is increased 1000 times
(d) none of the above

ANSWER
Answer : (b)

EXPLANATION
No answer description available for this question. Let us discuss.

49. The non-linear distortion of an amplifier is D without feedback. The amplifier has an open-loop voltage gain of Av and feedback fraction is mv. With negative voltage feedback, the non-linear distortion will be …….

(a) D (1 + Av mv)
(b) D (1 – Av mv)
(c) (1 + A m)/D
(d) 1 D/(1 + Avmv)

ANSWER
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

50. The output and input voltages of an emitter follower have a phase difference of …….

(a) 180º
(b) 90º
(c) 0º
(d) 270º

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

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