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.  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

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

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3. The common-mode voltage gain 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

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

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5. The use of negative feedback ………

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

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

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

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8. An ideal op-amp requires infinite bandwidth because

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9. A voltage follower ……….

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10. In the common mode, ……………

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

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

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Category: Operational amplifier

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

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14. The differential gain is ………

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

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

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16. A differential amplifier ……………..

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

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Category: Operational amplifier

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

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

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

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

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Category: Operational amplifier

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

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23. In differential-mode, …………….

 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

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

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

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Category: Operational amplifier

25. 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

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

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

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

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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 …….

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Category: Operational amplifier

29. The common-mode gain is ………..

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Category: Operational amplifier

30. Negative feedback ………..

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

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32. The op-amp can amplify

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

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34. Current cannot flow to ground through …….

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

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Category: Operational amplifier

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

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