Amplifiers – 1 – 8

36. If voltage gain without feedback and feedback fraction are Av and mv respectively, then gain with negative voltage feedback is ……..

(a) Av/(1-Avmv)
(b) Av/(1+Avmv)
(c) (1+Avmv)/Av
(d) (1 + Av mv) Av

ANSWER

EXPLANATION

37. The output impedance of an emitter follower is ……..

(a) high
(b) very high
(c) almost zero
(d) low

ANSWER

EXPLANATION

38. The approximate voltage gain of an amplifier with negative voltage feedback (feedback fraction being mv) is ………

(a) 1/mv
(b) mv
(c) 1 /(1 + mv)
(d) 1 – mv

ANSWER

EXPLANATION

39. If Av and Afb are the voltage gains of an amplifier without feedback and with negative feedback respectively, then feedback fraction is …….

(a) (1/Av) – (1/Afb)
(b) (1/Av) + (1/Afb)
(c) (Av/Afb) + (1/Av)
(d) (1/Afb) – (1/Av)

ANSWER

EXPLANATION

40. In the expression for voltage gain with negative voltage feedback, the term 1 + Am mv is known as ……..

(a) gain factor
(b) feedback factor
(c) sacrifice factor
(d) none of the above

ANSWER

EXPLANATION

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