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Operational Amplifier – 1 – 7

31. The common-mode voltage gain is ….

(a) smaller than differential voltage gain
(b) equal to differential voltage gain
(c) greater than differential voltage gain
(d) none of the above

Answer
Answer : (a)

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

32. The input stage of an OP-amp is usually a ….

(a) differential amplifier
(b) class Bpush-pull amplifier
(c) CEamplifier
(d) swamped amplifier

Answer
Answer : (a)

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

33. The common-mode voltage gain of a differential amplifier is equal to RC divided by ….

(a) r′e
(b) 2 r′e
(c) r′e/2
(d) 2 RE

Answer
Answer : (d)

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

34. Current cannot flow to ground through ….

(a) a mechanical ground
(b) an a.c. ground
(c) a virtual ground
(d) an ordinary ground

Answer
Answer : (c)

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

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