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.
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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.
Answer: Option B
Solution:
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.
Answer: Option D
Solution:
3. A comparator with a Schmitt trigger has
A. two trigger levels.
B. a fast response.
C. a slow response.
D. one trigger level.
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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.
Answer: Option B
Solution:
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.
Answer: Option D
Solution:
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
Answer: Option D
Solution:
8. Refer to Figure 13-1(a). Determine the output voltage.
Figure 13-1
A. 1 V
B. –1 V
C. +Vsat
D. –Vsat
Answer: Option C
Solution:
9. Refer to Figure 13-1(b). What is the output voltage?
A. 2 V
B. –2 V
C. +Vsat
D. –Vsat
Answer: Option D
Solution:
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
Answer: Option C
Solution:
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
Answer: Option B
Solution:
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
Answer: Option A
Solution:
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
Answer: Option D
Solution:
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
Answer: Option C
Solution:
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.
Answer: Option B
Solution:
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.
Answer: Option C
Solution:
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.
Answer: Option B
Solution:
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
Answer: Option C
Solution:
19. The output of a Schmitt trigger is a
A. pulse waveform.
B. sawtooth waveform.
C. sinusoidal waveform.
D. triangle waveform.
Answer: Option A
Solution:
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.
Answer: Option B
Solution:
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
Answer: Option C
Solution:
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
Answer: Option D
Solution:
23. A good example of hysteresis is a(n)
A. AM radio.
B. thermostat.
C. alarm clock.
D. none of the above
Answer: Option B
Solution:
24. A comparator with hysteresis is sometimes known as a(n)
A. integrator.
B. differentiator.
C. Schmitt trigger.
D. none of the above
Answer: Option C
Solution:
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
Answer: Option B
Solution:
26. Which of the following are variations of the basic summing amplifier?
A. averaging amplifier
B. scaling amplifier
C. both of the above
Answer: Option C
Solution:
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
Answer: Option A
Solution:
28. _____ is a mathematical process for determining the rate of change of a function.
A. Integration
B. Differentiation
C. Summing
D. Comparatoring
Answer: Option B
Solution:
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
Answer: Option A
Solution:
30. What type(s) of circuit(s) use comparators?
A. summer
B. nonzero-level detector
C. averaging amplifier
D. summer and nonzero-level detector
Answer: Option B
Solution:
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
Answer: Option A
Solution:
2. Bounding allows the output of a comparator to be an unlimited voltage.
A. True
B. False
Answer: Option B
Solution:
3. A positive feedback network for hysteresis improves an op-amp comparator’s noise immunity.
A. True
B. False
Answer: Option A
Solution:
4. Operational amplifiers are never used as nonlinear devices.
A. True
B. False
Answer: Option B
Solution:
5. The output voltage of a summing amplifier is proportional to the sum of the input voltages.
A. True
B. False
Answer: Option A
Solution:
6. The difference between the UTP and the LTP is the hysteresis voltage.
A. True
B. False
Answer: Option A
Solution:
7. An op-amp integrator uses a capacitor as the feedback element.
A. True
B. False
Answer: Option A
Solution:
8. An op-amp can be used as a comparator to determine when an input voltage exceeds a certain level.
A. True
B. False
Answer: Option A
Solution:
9. The output of an op-amp comparator will be zero when the input voltage exceeds the reference voltage.
A. True
B. False
Answer: Option B
Solution:
10. The R/2R ladder is commonly used for D/A converters.
A. True
B. False
Answer: Option A
Solution:
Check your work.
Complete List of Chapter MCQ in Floyd’s Electronic Devices
