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Operational Amplifier – 1 – 5

21. A certain inverting amplifier has a closed loop voltage gain of 25. The OP-amp has an open-loop voltage gain of 100,000. If an OP-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain ……….

(a) doubles
(b) drops to 12.5
(c) remains at 25
(d) increases slightly

ANSWER

EXPLANATION

22. A voltage follower ….

(a) has a voltage gain of 1
(b) in noninverting
(c) has no feedback resistor
(d) has all of these

ANSWER

EXPLANATION

23. The OP-amp can amplify ….

(a) a.c. signals only
(b) d.c. signals only
(c) both a.c. and d.c. signals
(d) neither d.c. nor a.c. signals

ANSWER

EXPLANATION

24. The input offset current equals the ….

(a) difference between two base currents
(b) average of two base currents
(c) collector current divided by current gain
(d) none of these

ANSWER

EXPLANATION

25. The tail current of a differential amplifier is ….

(a) half of either collector current
(b) equal to either collector current
(c) two times either collector current
(d) equal to the difference in base currents

ANSWER

EXPLANATION

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