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. 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

2. The common-mode gain is ………..

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

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

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

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

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

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

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

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Category: Operational amplifier

11. Current cannot flow to ground through …….

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

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Category: Operational amplifier

13. The op-amp can amplify

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14. A differential amplifier ……………..

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

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16. The use of negative feedback ………

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

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

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18. An ideal op-amp requires infinite bandwidth because

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Category: Operational amplifier

19.  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

20. In the common mode, ……………

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Category: Operational amplifier

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

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

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23. In differential-mode, …………….

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

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. 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

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

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

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Category: Operational amplifier

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

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30. A voltage follower ……….

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

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32. The differential gain is ………

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33. Negative feedback ………..

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

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

35. 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

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

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