# MCQs in Basic Op-Amp Circuits

(Last Updated On: December 8, 2017)

This is the Multiple Choice Questions in Basic Op-Amp Circuits from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. If an op-amp comparator has a gain of 100,000, an input difference of 0.2 mV above reference, and a supply of ±12 V, the output will be

• A. 20 V.
• B. 12 V.
• C. 10 V.
• D. 15 V.

2. To reduce the effects of noise resulting in erratic switching of output states of a comparator, you can use

• A. the upper trigger point.
• B. the lower trigger point.
• C. nonzero-level detection.
• D. hysteresis.

3. A comparator with a Schmitt trigger has

• A. two trigger levels.
• B. a fast response.
• C. a slow response.
• D. one trigger level.

4. In a comparator with output bounding, what type of diode is used in the feedback loop?

• A. Schottky
• B. junction
• C. zener
• D. varactor

5. In a flash A/D converter, the priority encoder is used to

• A. select the first input.
• B. select the highest value input.
• C. select the lowest value input.
• D. select the last input.

6. A differentiator is used to measure

• A. the sum of the input voltages.
• B. the difference between two voltages.
• C. the area under a curve.
• D. the rate of change of the input voltage.

7. An op-amp has an open-loop gain of 90,000. Vsat = ±13 V. A differential voltage of 0.1 V p-p is applied between the inputs. What is the output voltage?

• A. 13 V
• B. –13 V
• C. 13 Vp-p
• D. 26 Vp-p

8. Refer to Figure 13-1(a). Determine the output voltage.

Figure 13-1

• A. 1 V
• B. –1 V
• C. +Vsat
• D. –Vsat

9. Refer to Figure 13-1(b). What is the output voltage?

• A. 2 V
• B. –2 V
• C. +Vsat
• D. –Vsat

10. Refer to Figure 13-1(c). With the inputs shown, determine the output voltage.

• A. 7 V
• B. –7 V
• C. +Vsat
• D. –Vsat

11. Refer to Figure 13-2(a). What is the output voltage?

Figure 13-2

• A. 0.5 V
• B. –0.5 V
• C. 2 V
• D. –2 V

12. Refer to Figure 13-2(b). Determine the output voltage, VOUT.

• A. 1.05 V
• B. –0.35 V
• C. 0.35 V
• D. –1.05 V

13. Refer to Figure 13-3(a). Determine the upper trigger point.

Figure 13-3

• A. V(out)max
• B. –V(out)max
• C. –1.41 V
• D. +1.41 V

14. Refer to Figure 13-3(b). Determine the lower trigger point.

• A. +V(out)max
• B. –V(out)max
• C. –2.47 V
• D. +2.47 V

15. Refer to Figure 13-4(a). This circuit is known as

Figure 13-4

• A. a noninverting amplifier.
• B. a differentiator.
• C. an integrator.
• D. a summing amplifier.

16. Refer to Figure 13-4(b). This circuit is known as

• A. a noninverting amplifier.
• B. a differentiator.
• C. an integrator.
• D. a summing amplifier.

17. Refer to Figure 13-4(b). A square-wave input is applied to this amplifier. The output voltage is most likely to be

• A. a square wave.
• B. a triangle wave.
• C. a sine wave.
• D. no output.

18. Refer to Figure 13-4(b). If Vin = 5 V, the rate of change of the output voltage in response to a single pulse input is:

• A. 15.2 mV/µs
• B. 1.52 V/µs
• C. 1.52 mV/µs
• D. 15.2 V/µs

19. The output of a Schmitt trigger is a

• A. pulse waveform.
• B. sawtooth waveform.
• C. sinusoidal waveform.
• D. triangle waveform.

20. A Schmitt trigger is

• A. a comparator with only one trigger point.
• B. a comparator with hysteresis.
• C. a comparator with three trigger points.
• D. none of the above.

21. An integrator circuit

• A. uses a resistor in its feedback circuit.
• B. uses an inductor in its feedback circuit.
• C. uses a capacitor in its feedback circuit.
• D. uses a resistor in its feedback circuit or uses a capacitor in its feedback circuit

22. In a(n) _____, when the input voltage exceeds a specified reference voltage, the output changes state.

• A. integrator
• B. differentiator
• C. summing amplifier
• D. comparator

23. A good example of hysteresis is a(n)

• A. AM radio.
• B. thermostat.
• C. alarm clock.
• D. none of the above

24. A comparator with hysteresis is sometimes known as a(n)

• A. integrator.
• B. differentiator.
• C. Schmitt trigger.
• D. none of the above

25. What is (are) the necessary component(s) for the design of a bounded comparator?

• A. rectifier diodes
• B. zener diodes
• C. both of the above

26. Which of the following are variations of the basic summing amplifier?

• A. averaging amplifier
• B. scaling amplifier
• C. both of the above

27. What circuit produces an output that approximates the area under the curve of an input function?

• A. integrator
• B. differentiator
• C. summing amplifier
• D. comparator

28. _____ is a mathematical process for determining the rate of change of a function.

• A. Integration
• B. Differentiation
• C. Summing
• D. Comparatoring

29. A(n) ______ amplifier is a summing amplifier with a closed-loop gain equal to the reciprocal of the number of inputs.

• A. averaging
• B. scaling
• C. differentiating
• D. none of the above

30. What type(s) of circuit(s) use comparators?

• A. summer
• B. nonzero-level detector
• C. averaging amplifier
• D. summer and nonzero-level detector

#### TRUE/FALSE

1. In an op-amp comparator, when the input voltage exceeds a reference voltage, the voltage output changes state.

• A. True
• B. False

2. Bounding allows the output of a comparator to be an unlimited voltage.

• A. True
• B. False

3. A positive feedback network for hysteresis improves an op-amp comparator’s noise immunity.

• A. True
• B. False

4. Operational amplifiers are never used as nonlinear devices.

• A. True
• B. False

5. The output voltage of a summing amplifier is proportional to the sum of the input voltages.

• A. True
• B. False

6. The difference between the UTP and the LTP is the hysteresis voltage.

• A. True
• B. False

7. An op-amp integrator uses a capacitor as the feedback element.

• A. True
• B. False

8. An op-amp can be used as a comparator to determine when an input voltage exceeds a certain level.

• A. True
• B. False

9. The output of an op-amp comparator will be zero when the input voltage exceeds the reference voltage.

• A. True
• B. False

10. The R/2R ladder is commonly used for D/A converters.

• A. True
• B. False

### Complete List of Chapter MCQs in Floyd’s Electronic Devices

MCQs in Basic Op-Amp Circuits
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