Op Amp MCQs | Op Amp Short Questions(MCQs) & Answers

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Questions
41 The common-mode voltage gain of a differential amplifier is equal to RC divided by ……..
A r’e
B 2r’e
C r’e/2
D 2RE

Answer: 2RE
42 If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will
A Not need an input resistor
B Be virtual ground
C Have high reverse current
D Not invert the signal

Answer: Be virtual ground
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43 The closed-loop voltage gain of an inverting amplifier equal to
A The ratio of the input resistance to feedback resistance
B The open-loop voltage gain
C The feedback resistance divided by the input resistance
D The input resistance

Answer: The feedback resistance divided by the input resistance
44 An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed
A 795mV
B 395mV
C 795mV
D 39.5mV

Answer: 795mV
45 The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k
A ∞
B 120k
C 110k
D 10k

Answer: 110k
46 A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by
A 2
B 1
C 1/2
D 0

Answer: 2
47 Which of the following amplifier is used in a digital to analog converter?
A Non inverter
B Voltage follower
C Summer
D Difference amplifier

Answer: Summer
48 When a step-input is given to an op-amp integrator, the output will be
A A ramp
B A sinusoidal wave
C A rectangular wave
D A triangular wave with dc bias

Answer: A ramp
49 In the above circuit the current ix is
A 0.6A
B 0.5A
C 0.2A
D 1/12A

Answer: 0.5A
50 When a differential amplifier is operated single-ended, …………
A the output is grounded
B one input is grounded and signal is applied to the other
C both inputs are connected together
D the output is not inverted

Answer: one input is grounded and signal is applied to the other
51 The differential gain is ………
A very high
B very low
C dependent on input voltage
D about 100

Answer: very high
52 With zero volts on both inputs, an OP-amp ideally should have an output ………..
A equal to the positive supply voltage
B equal to the negative supply voltage
C equal to zero
D equal to CMRR

Answer: equal to zero
53 Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is ……
A 1
B 2000
C 80 dB
D 100,000

Answer: 100,000
54 The output of a particular Op-amp increases 8V in 12µs. The slew rate is …….
A 90 V/µs
B 0.67 V/µs
C 1.5 V/µs
D none of these

Answer: 0.67 V/µs
55 Negative feedback ………..
A increases the input and output impedances
B increases the input impedance and bandwidth
C decreases the output impedance and bandwidth
D does not affect impedance or bandwidth

Answer: increases the input impedance and bandwidth
56 A voltage follower ……….
A has a voltage gain of 1
B is noninverting
C has no feedback resistor
D has all of these

Answer: has all of these
57 The tail current in a differential amplifier equals …….
A difference between two emitter currents
B sum of two emitter currents
C collector current divided by current gain
D collector voltage divided by collector resistance

Answer: sum of two emitter currents
58 The input impedance of a differential amplifier equals r’e times ……
A ß
B RE
C RC
D 2ß

Answer: 2ß
59 The common-mode voltage gain is ………
A smaller than differentail voltage gain
B equal to differential voltage gain
C greater than differential voltage gain
D none of the above

Answer: smaller than differentail voltage gain
60 The common-mode voltage gain of a differential amplifier is equal to RC divided by ……..
A r’e
B 2r’e
C r’e/2
D 2RE

Answer: 2RE

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