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Op Amp Quiz | Op Amp Objective Type Questions & Answers

Questions
21 Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF
A 1.273kHz
B 12.73kHz
C 127.3 kHz
D 127.3 Hz

Answer: 1.273kHz
22 How many op-amps are required to implement this equation Vo = V1
A 4
B 3
C 2
D 1

Answer: 1
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23 An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is
A 10 volts
B 5 volts
C 5/ volts
D 5/2 volts

Answer: 5/2 volts
24 An ideal OP-AMP is an ideal
A Current controlled Current source
B Current controlled Voltage source
C Voltage controlled Voltage source
D Voltage controlled Current source

Answer: Voltage controlled Voltage source
25 A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of
A 50KHz
B 100KHz
C 1000/17KHz
D 1000/7.07KHz

Answer: 50KHz
26 An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is
A 10 V
B 5 V
C 5V
D 5/2 V

Answer: 10 V
27 Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be
A Square wave
B Triangular wave
C Parabolic wave
D Sine wave

Answer: Sine wave
28 A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high
A CMMR
B Bandwidth
C Slew rate
D Open-loop gain

Answer: Slew rate
29 In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is
A 23dB
B 25dB
C 46dB
D 50dB

Answer: 46dB
30 Differential amplifiers are used in
A Instrumentation amplifiers
B Voltage followers
C Voltage regulators
D Buffers

Answer: Instrumentation amplifiers
31 For an ideal op-amp, which of the following is true?
A The differential voltage across the input terminals is zero
B The current into the input terminals is zero
C The current from output terminal is zero
D The output resistance is zero

Answer: The current from output terminal is zero
32 The two input terminals of an opamp are labeled as
A High and low
B Positive and negative
C Inverting and non inverting
D Differential ans non differential

Answer: Inverting and non inverting
33 For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by
A Av + Ac
B Av / Ac
C 1 + Av / Ac)
D Ac / Av

Answer: Av / Ac
34 Hysteresis is desirable in Schmitt-trigger, because
A Energy is to be stored/discharged in parasitic capacitances
B Effects of temperature would be compensated
C Devices in the circuit should be allowed time for saturation and desaturation
D It would prevent noise from causing false triggering

Answer: Devices in the circuit should be allowed time for saturation and desaturation
35 The output voltage Vo of the above circuit is
A -6V
B -5V
C -1.2V
D -0.2V

Answer: -5V
36 In differential-mode, …………….
A opposite polarity signals are applied to the inputs
B the gain is one
C the outputs are of different amplitudes
D only one supply voltage is used

Answer: opposite polarity signals are applied to the inputs
37 In the common mode, ……………
A both inputs are grounded
B the outputs are connected together
C an identical signal appears on both the inputs
D the output signal are in-phase

Answer: an identical signal appears on both the inputs
38 If ADM = 3500 and ACM = 0.35, the CMRR is ……….
A 1225
B 10,000
C 80 dB
D (1) and (3)

Answer: (1) and (3)
39 A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain is ………
A 100,000
B 1000
C 101
D 100

Answer: 101
40 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

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