This is the Multiple Choice Questions in Operational Amplifiers Applications from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. 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.
Online Questions and Answers Topic Outline
- MCQ in Constant-Gain Multiplier
- MCQ in Voltage Summing
- MCQ in Voltage Buffer
- MCQ in Controller Sources
- MCQ in Instrumentation Circuits
- MCQ in Active Filters
Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. Determine the output voltage for this circuit with a sinusoidal input of 2.5 mV.
![clip_image002[31]](https://lh5.ggpht.com/-tKKb90ZRQ1U/VFM4_hG_phI/AAAAAAAABuc/vtK1cwzIvn8/s1600-h/clip_image002%25255B31%25255D%25255B12%25255D.png "clip_image002[31]")
a. –0.25 V
b. –0.125 V
c. 0.25 V
d. 0.125 V
Answer: Option B
Solution:
2. Calculate the input voltage for this circuit if Vo = –11 V.
a. 1.1 V
b. –1.1 V
c. –1 V
d. 1 V
Answer: Option A
Solution:
3. Calculate the output voltage.
a. –6.00 mV
b. 6.0 mV
c. 6.12 mV
d. –6.12 Mv
Answer: Option C
Solution:
4. Calculate the input voltage when Vo = 11 V.
a. 1.1 V
b. –1.1 V
c. –1 V
d. 1 V
Answer: Option D
Solution:
5. Calculate the output voltage.
a. 3.02 V
b. 2.03 V
c. 1.78 V
d. 1.50 V
Answer: Option A
Solution:
6. Calculate the output of the first-stage op-amp when V1 = 25 mV.
![clip_image012[11]](https://lh6.ggpht.com/-x0EBsCapGRo/VFM5GKSSi8I/AAAAAAAABvs/scsBEaBQ0ZM/s1600-h/clip_image012%25255B11%25255D%25255B12%25255D.png "clip_image012[11]")
a. –1.05 V
b. 0.075 V
c. 0.06 V
d. 4.2 V
Answer: Option B
Solution:
7. Calculate the output of the second stage op-amp if V1 = 25 mV.
a. –0.075 V
b. 0.525 V
c. 0.06 V
d. 4.2 V
Answer: Option A
Solution:
8. Calculate the input voltage if the final output is 10.08 V.
a. –1.05 V
b. 0.525 V
c. 0.168 V
d. 4.2 V
Answer: Option C
Solution:
9. Determine the value of Rf (assuming that all have the same value).
a. 500 kΩ
b. 50 kΩ
c. 25 kΩ
d. 5 kΩ
Answer: Option B
Solution:
10. When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains.
a. True
b. False
Answer: Option B
Solution:
11. A number of op-amp stages can be used to provide separate gains.
a. True
b. False
Answer: Option A
Solution:
12. Calculate the output voltage if V1 = V2 = 0.15 V.
a. 0 V
b. 4.65 V
c. 6.45 V
d. –6.45 V
Answer: Option D
Solution:
13. Calculate the output voltage if V1 = –3.3 V and V2 = 0.8 V
a. 0 V
b. –6.6 V
c. –4 V
d. 2 V
Answer: Option B
Solution:
14. Calculate the output voltage if V1 = 33 mV and V2 = 02 mV.
a. 0 V
b. –6.6 V
c. –4 V
d. 2
Answer: Option C
Solution:
15. Calculate the output voltage if V1 = 0 V and V2 = 0.2 V.
a. 0 V
b. –6.6 V
c. –4 V
d. 2 V
Answer: Option B
Solution:
16. Calculate the output voltage if V1 = –0.2 V and V2 = 0 V.
a. 0 V
b. –6.6 V
c. –4 V
d. 2 V
Answer: Option D
Solution:
17. Determine the output voltage
a. 10(V2 – Vi)
b. –10(V2 – V1)
c. –10(V1 – V2)
d. None of the above
Answer: Option B
Solution:
18. Calculate the output voltage if V1 = 300 mV and V2 = 700 mV.
a. 0 V
b. –12 V
c. 12 V
d. –4 V
Answer: Option D
Solution:
19. Calculate the output voltage if V1 = V2 = 700 mV.
a. 0 V
b. –12 V
c. 12 V
d. –8 V
Answer: Option A
Solution:
20. Refer to Fig. Calculate the output voltage Vo if V1 = –V2 = 300 mV.
a. 0 V
b. –12 V
c. 12 V
d. –8 V
Answer: Option C
Solution:
21. Determine the output voltage when V1 = V2 = 1 V.
a. 0 V
b. –2 V
c. 1 V
d. 2 V
Answer: Option A
Solution:
22. Determine the output voltage when V1 = –V2 = 1 V.
a. 0 V
b. –2 V
c. 1 V
d. 2 V
Answer: Option D
Solution:
23. Determine the output voltage when V1 = –V2 = –1 V.
a. 0 V
b. –2 V
c. 1 V
d. 2 V
Answer: Option B
Solution:
24. How many op-amps are required to implement this equation?
a. 2
b. 3
c. 4
d. 1
Answer: Option B
Solution:
25. How many op-amps are required to implement this equation?
a. 2
b. 3
c. 4
d. 1
Answer: Option A
Solution:
26. How many op-amps are required to implement this equation?
a. 2
b. 3
c. 4
d. 1
Answer: Option D
Solution:
27. How many op-amps are required to implement this equation? Vo = V1
a. 2
b. 3
c. 4
d. 1
Answer: Option D
Solution:
28. Calculate IL for this circuit.
a. 3 mA
b. 4 mA
c. 5 mA
d. 6 mA
Answer: Option C
Solution:
29. Calculate the output voltage for this circuit when V1 = 2.5 V and V2 = 2.25 V.
a. –5.25 V
b. 2.5 V
c. 2.25 V
d. 5.25 V
Answer: Option D
Solution:
30. An example of an instrumentation circuit is a(n) _______.
a. dc voltmeter
b. display driver
c. ac voltmeter
d. All of the above
Answer: Option D
Solution:
31. This circuit is an example of a(n)_________.
a. dc voltmeter
b. display driver
c. instrumentation amplifier
d. None of the above
Answer: Option C
Solution:
32. Calculate the cut-off frequency of a first-order low-pass filter for R1 = 2.5 kΩ and C1 = 0.05 μF.
a. 1.273 kHz
b. 12.73 kHz
c. 127.3 kHz
d. 127.30 Hz
Answer: Option A
Solution:
33. Calculate the cutoff frequencies of a bandpass filter with R1 = R2 = 5 kΩ and C1 = C2 = 0.1 μF.
a. fOL = 318.3 Hz, fOH = 318.3 Hz
b. fOL = 636.6 Hz, fOH = 636.6 Hz
c. fOL = 318.3 Hz, fOH = 636.6 Hz
d. fOL = 636.6 Hz, fOH = 318.3 Hz
Answer: Option A
Solution:
34. A filter that provides a constant output from dc up to a cut-off frequency and passes no signal above that frequency is called a _______ filter.
a. low-pass
b. high-pass
c. bandpass
d. none of the above
Answer: Option A
Solution:
35. A difference between a passive filter and an active filter is that a passive filter uses amplifier(s), but an active filter does not.
A. True
B. False
Answer: Option B
Solution:
FILL-IN-THE-BLANKS
1. The level of the output voltage of an op-amp circuit is always _______ the level of VCC.
A. larger than
B. the same as
C. smaller than
D. None of the above
Answer: Option C
Solution:
2. The input to an op-amp can be a(n) ________.
A. dc source
B. ac source
C. combination of ac and dc sources
D. All of the above
Answer: Option D
Solution:
3. When a number of stages are connected in series, the overall gain is the ________ of the individual stage gains.
A. sum
B. product
C. difference
D. average
Answer: Option B
Solution:
4. ________ build a multistage connection.
A. Only an inverting op-amp circuit must be used to
B. Only a noninverting op-amp circuit must be used to
C. Both inverting and noninverting op-amp circuits can be used to
D. Neither inverting nor noninverting op-amp circuits must be used to
Answer: Option C
Solution:
5. A voltage summing amplifier has ________.
A. several inputs and several outputs
B. several inputs and one output
C. one input and several outputs
D. one input and one output
Answer: Option B
Solution:
6. The voltage gain of a voltage buffer is _______ .
A. 1
B. 0
C. –1
D. –5
Answer: Option A
Solution:
7. The output voltage of a voltage buffer is _______ with the input voltage.
A. in phase
B. 45° out of phase
C. 90° out of phase
D. 180° out of phase
Answer: Option A
Solution:
8. The input impedance of a voltage buffer is _______.
A. very low
B. low
C. high
D. very high
Answer: Option D
Solution:
9. The output impedance of a voltage buffer is _______.
A. very low
B. low
C. high
D. very high
Answer: Option B
Solution:
10. Op-amps can be used to form ________ circuit(s).
A. voltage-controlled voltage source
B. voltage-controlled current source
C. current-controlled voltage source
D. All of the above
Answer: Option D
Solution:
11. ________ in a current-controlled voltage source circuit.
A. The input current depends on the output voltage
B. The input current depends on the input voltage source
C. The output voltage depends on the input current.
D. The output current depends on the output voltage source
Answer: Option C
Solution:
12. ________ can be used as a voltage-controlled voltage source.
A. Only an inverting op-amp circuit
B. Only a noninverting op-amp circuit
C. Neither inverting nor noninverting op-amp circuits
D. Both inverting and noninverting op-amp circuits
Answer: Option D
Solution:
13. In a current-controlled voltage source using the inverting op-amp circuit, the controlled output current is _______ with the input voltage source.
A. in phase
B. 45° out of phase
C. 90° out of phase
D. 180° out of phase
Answer: Option A
Solution:
14. Op-amp circuits are used in _______ voltmeters.
A. only dc
B. only ac
C. both ac and dc
D. neither ac nor dc
Answer: Option C
Solution:
15. In a current-controlled current source, the controlled current Io depends on _______.
A. I1
B. R1
C. R2
D. All of the above
Answer: Option D
Solution:
16. In a dc millivoltmeter, the amplifier provides a meter with _______ input impedance and a scale factor dependent on _______ value and accuracy.
A. high, resistor
B. low, resistor
C. high, capacitor
D. None of the above
Answer: Option A
Solution:
17. In a millivoltmeter, the diodes and the capacitor are used in _____ parts of the circuit.
A. the dc
B. the ac
C. both the dc and ac
D. neither the dc nor ac
Answer: Option B
Solution:
18. In an instrumentation amplifier, the output voltage is based on the _____ times a scale factor.
A. summation of the two inputs
B. product of the two inputs
C. difference between the two inputs
D. None of the above
Answer: Option C
Solution:
19. A(n) _______ is not a component of a passive filter.
A. op-amp
B. capacitor
C. inductor
D. resistor
Answer: Option A
Solution:
20. An active circuit is composed of a(n) ________.
A. resistor
B. capacitor
C. op-amp
D. All of the above
Answer: Option D
Solution:
21. A low-pass filter ________.
A. provides a constant output up to the cutoff frequency
B. passes frequencies from zero up to the cutoff frequency
C. rejects all frequencies above the cutoff frequency
D. All of the above
Answer: Option D
Solution:
22. A filter that passes signals that are above one ideal cutoff frequency and below a second cutoff frequency is called _________.
A. low-pass
B. high-pass
C. bandpass
D. band reject
Answer: Option C
Solution:
23. The roll-off for a first-order high-pass filter is _______.
A. –20 dB/decade
B. –6 dB/octave
C. either –20 dB/decade or –6 dB/octave
D. None of the above
Answer: Option C
Solution:
24. The roll-off for a second-order high-pass filter is _______.
A. either –20 dB per decade or –6 dB per octave
B. either –40 dB per decade or –12 dB per octave
C. either –60 dB per decade or –18 dB per octave
D. None of the above
Answer: Option B
Solution:
25. A bandpass filter uses _______ circuit.
A. a high-pass
B. a low-pass
C. a high-pass and a low-pass
D. neither a low-pass nor a high-pass
Answer: Option C
Solution:
Check your work.
Complete List of Chapter Quiz in Electronic Devices and Circuit Theory
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