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op amp circuits MCQs

Practise focused op amp circuits questions with marked answers for exam preparation and subject revision.

op amp circuits Mcqs
1. How many op-amps are required to implement this equation Vo = V1?
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A. 3

B. 1

C. 4

D. 2

2. The closed-loop voltage gain of an inverting amplifier equal to______________?
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A. The open-loop voltage gain

B. The feedback resistance divided by the input resistance

C. The input resistance

D. The ratio of the input resistance to feedback resistance

3. An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?
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A. 5/2 volts

B. 10 volts

C. 5/ volts

D. 5 volts

4. The two input terminals of an opamp are labeled as______________?
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A. High and low

B. Inverting and non inverting

C. Differential ans non differential

D. Positive and negative

5. In the above circuit the current ix is___________?
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A. 1/12A

B. 0.5A

C. 0.2A

D. 0.6A

6. For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?
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A. Av / Ac

B. Av + Ac

C. Ac / Av

D. 1 + Av / AC.

7. An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is____________?
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A. 10 V

B. 5/2 V

C. 5V

D. 5 V

8. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5k? and C1 = 0.05?F___________?
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A. 127.3 Hz

B. 1.273kHz

C. 127.3 kHz

D. 12.73kHz

9. If ground is applied to the (+) terminal of an inverting op-amp, the () terminal will_____________?
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A. Have high reverse current

B. Not invert the signal

C. Not need an input resistor

D. Be virtual ground
10. Hysteresis is desirable in Schmitt-trigger, because______________?
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A. Energy is to be stored/discharged in parasitic capacitances

B. It would prevent noise from causing false triggering

C. Devices in the circuit should be allowed time for saturation and desaturation

D. Effects of temperature would be compensated

11. The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?
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A. ?

B. 120k

C. 110k

D. 10k

12. When a step-input is given to an op-amp integrator, the output will be______________?
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A. A ramp

B. A rectangular wave

C. A triangular wave with dc bias

D. A sinusoidal wave

13. The output voltage Vo of the above circuit is____________?
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A. -1.2V

B. -6V

C. -0.2V

D. -5V
14. 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______________?
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A. CMMR

B. Open-loop gain

C. Bandwidth

D. Slew rate
15. Differential amplifiers are used in______________?
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A. Voltage followers

B. Buffers

C. Voltage regulators

D. Instrumentation amplifiers
16. Which of the following amplifier is used in a digital to analog converter?
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A. Difference amplifier

B. Non inverter

C. Summer

D. Voltage follower

17. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?
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A. 2-Jan

B. 0

C. 2

D. 1

18. An ideal OP-AMP is an ideal______________?
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A. voltage controlled current source

B. Current controlled Current source

C. Current controlled voltage source

D. Voltage controlled voltage source
19. Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
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A. Triangular wave

B. Parabolic wave

C. Square wave

D. Sine wave
20. 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_____________?
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A. 795mV

B. 795mV

C. 395mV

D. 39.5mV

21. How many op-amps are required to implement this equationop-amps?
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A. 2

B. 1

C. 3

D. 4

22. For an ideal op-amp, which of the following is true?
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A. The current into the input terminals is zero

B. The output resistance is zero

C. The differential voltage across the input terminals is zero

D. The current from output terminal is zero
23. A non inverting closed loop op amp circuit generally has a gain factor______________?
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A. Greater than one

B. Less than one

C. Equal to one

D. Of zero

24. The ideal OP-AMP has the following characteristics
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A. Ri=? ,A=? ,R0=?

B. Ri=? ,A=? ,R0=0

C. Ri=0 ,A=? ,R0=0

D. Ri=0 ,A=? ,R0=?

25. 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________________?
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A. 46dB

B. 25dB

C. 23dB

D. 50dB

26. 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______________?
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A. 50KHz

B. 1000/17KHz

C. 1000/7.07KHz

D. 100KHz

27. An ideal OP-AMP is an ideal__________?
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A. Current controlled Current source

B. Voltage controlled Voltage source

C. Voltage controlled Current source

D. Current controlled Voltage source