Op Amp MCQs | Op Amp Multiple Choice Questions with Answers

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Questions
61 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: remains at 25
62 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: both a.c. and d.c. signals
63 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: two times either collector current
64 A common-mode signal is applied to ……….
A the noninverting input
B the inverting input
C both iputs
D top of the tail resistor

Answer: both iputs
65 The common-mode gain is ………..
A very high
B very low
C always unity
D unpredictable

Answer: very low
66 A certain OP-amp has bias currents of 50 µA. The input offset current is ……..
A 700 nA
B 99.3 µA
C 49.7 µA
D none of these

Answer: 700 nA
67 For an Op-amp with negative feedback, the output is …….
A equal to the input
B increased
C fed back to the inverting input
D fed back to the noninverting input

Answer: fed back to the inverting input
68 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: both a.c. and d.c. signals
69 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: difference between two base currents
70 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: two times either collector current
71 Current cannot flow to ground through …….
A a mechanical ground
B an a.c. ground
C a virtual ground
D an ordinary ground

Answer: a virtual ground

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