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Operational amplifier MCQ Quiz (multiple choice questions)

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Operational Amplifier

Operational amplifier (opamp) Multiple choice questions answers

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Category: Operational amplifier

1. The input stage of an Op-amp is usually a ……….

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Category: Operational amplifier

2. For an Op-amp with negative feedback, the output is ……

 Output voltage is proportional to input voltage only until it reaches the saturation voltage. The output cannot exceed the positive and negative saturation voltage. These saturation voltages are specified by an output voltage swing rating of the op-amp for given values of supply voltage.

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Category: Operational amplifier

3. Which factor determine the output voltage of an op-amp?

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Category: Operational amplifier

4. The common-mode voltage gain of a differential amplifier is equal to Rdivided by …….

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Category: Operational amplifier

5. A certain OP-amp has bias currents of 50 μA. The input offset current is ……..

An ideal op-amp exhibits zero output resistance so that output can drive an infinite number of other devices.

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Category: Operational amplifier

6. Which of the following electrical characteristics is not exhibited by an ideal op-amp?

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Category: Operational amplifier

7. The use of negative feedback ………

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Category: Operational amplifier

8. The common-mode voltage gain is ………

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Category: Operational amplifier

9. In the common mode, ……………

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Category: Operational amplifier

10. The op-amp can amplify

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Category: Operational amplifier

11. In differential-mode, …………….

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Category: Operational amplifier

12. A differential amplifier ……………..

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Category: Operational amplifier

13.  Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is ……

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Category: Operational amplifier

14. A common-mode signal is applied to ……….

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Category: Operational amplifier

15. With zero volts on both inputs, an OP-amp ideally should have an output ………..

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Category: Operational amplifier

16.  If the feedback resistor in Q15 (above question) is open, the voltage gain …….

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Category: Operational amplifier

17. The node voltage at the top of the til resistor is closes to 

The output voltage of an ideal op-amp is the product of gain and the algebraic difference between the two input voltages.

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Category: Operational amplifier

18. Find the output voltage of an ideal op-amp. If V1 and V2 are the two input voltages

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Category: Operational amplifier

19. The common-mode gain is ………..

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Category: Operational amplifier

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

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Category: Operational amplifier

21. A voltage follower ……….

Explanation: The output voltage, VO = (Vin1– Vin2)
=> 12v=3×(2- Vin2)
=> Vin2= -2v.

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Category: Operational amplifier

22. Find the input voltage of an ideal op-amp. It’s one of the inputs and output voltages are 2v and 12v. (Gain=3)

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Category: Operational amplifier

23. The tail current in a differential amplifier equals …….

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Category: Operational amplifier

24. The output of a particular Op-amp increases 8V in 12μs. The slew rate is …….

Input resistance is infinite so almost any signal source can drive it and there is no loading of the preceding stage.

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Category: Operational amplifier

25. Which is not the ideal characteristic of an op-amp?

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Category: Operational amplifier

26. If ADM = 3500 and ACM = 0.35, the CMRR is ……….

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Category: Operational amplifier

27. The input impedance of a differential amplifier equals r’e

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Category: Operational amplifier

28. 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 …….

An ideal op-amp has infinite bandwidth. Therefore, any frequency signal from 0 to ∞ Hz can be amplified without attenuation.

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Category: Operational amplifier

29. An ideal op-amp requires infinite bandwidth because

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Category: Operational amplifier

30.  When a differential amplifier is operated single-ended, …………

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Category: Operational amplifier

31. The differential gain is ………

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Category: Operational amplifier

32. Current cannot flow to ground through …….

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33. The input offset current equals the ……….

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Category: Operational amplifier

34. A certain noninverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is ………

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Category: Operational amplifier

35. The differential voltage gain of a differential amplifier is equal to RC divided by …….

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Category: Operational amplifier

36. Negative feedback ………..

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