Amplifiers – 1 – 4

16. Two stages of BJT amplifiers are cascaded by RC coupling. The voltage gain of the first stage is 10 and that of the second stage is 20. The overall gain of the coupled amplifier is :

(a) 10×20
(b) 10+20
(c) (10+20)2
(d) (10×20)/2

ANSWER

EXPLANATION

17 . Which of the following parameters is used for distinguishing between a small signal and a large-signal amplifier ?

(a) instability
(b) bandwidth
(c) overall gain
(d)
 distortion

ANSWER

EXPLANATION

18. The current amplification factor in CE configuration is :

(a) α
(b) β+ 1
(c) 1/β
(d) β

ANSWER

EXPLANATION

19. When negative voltage feedback is applied to an amplifier, its voltage gain …………

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

ANSWER

EXPLANATION

20. The value of negative feedback fraction is always ……….

(a) less than 1
(b) more than 1
(c) equal to 1
(d) 
none of the above

ANSWER

EXPLANATION

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