# MCQs in Op-Amp Applications

MCQs in Operational Amplifiers Applications from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad.

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

• MCQs in Constant-Gain Multiplier
• MCQs in Voltage Summing
• MCQs in Voltage Buffer
• MCQs in Controller Sources
• MCQs in Instrumentation Circuits
• MCQs 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.

• a. –0.25 V
• b. –0.125 V
• c. 0.25 V
• d. 0.125 V

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

3. Calculate the output voltage.

• a. –6.00 mV
• b. 6.0 mV
• c. 6.12 mV
• d. –6.12 Mv

4. Calculate the input voltage when Vo = 11 V.

• a. 1.1 V
• b. –1.1 V
• c. –1 V
• d. 1 V

5. Calculate the output voltage.

• a. 3.02 V
• b. 2.03 V
• c. 1.78 V
• d. 1.50 V

6. Calculate the output of the first-stage op-amp when V1 = 25 mV.

• a. –1.05 V
• b. 0.075 V
• c. 0.06 V
• d. 4.2 V

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

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

9. Determine the value of Rf (assuming that all have the same value).

• a. 500 kâ„¦
• b. 50 kâ„¦
• c. 25 kâ„¦
• d. 5 kâ„¦

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

11. A number of op-amp stages can be used to provide separate gains.

• a. True
• b. False

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

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

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

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

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

17. Determine the output voltage.

• a. 10(V2 – Vi)
• b. –10(V2 – V1)
• c. –10(V1 – V2)
• d. None of the above

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

19. Calculate the output voltage if V1 = V2 = 700 mV.

• a. 0 V
• b. –12 V
• c. 12 V
• d. –8 V

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

21. Determine the output voltage when V1 = V2 = 1 V.

• a. 0 V
• b. –2 V
• c. 1 V
• d. 2 V

22. Determine the output voltage when V1 = –V2 = 1 V.

• a. 0 V
• b. –2 V
• c. 1 V
• d. 2 V

23. Determine the output voltage when V1 = –V2 = –1 V.

• a. 0 V
• b. –2 V
• c. 1 V
• d. 2 V

24. How many op-amps are required to implement this equation?

• a. 2
• b. 3
• c. 4
• d. 1

25. How many op-amps are required to implement this equation?

• a. 2
• b. 3
• c. 4
• d. 1

26. How many op-amps are required to implement this equation?

• a. 2
• b. 3
• c. 4
• d. 1

27. How many op-amps are required to implement this equation?

Vo = V1

• a. 2
• b. 3
• c. 4
• d. 1

28. Calculate IL for this circuit.

• a. 3 mA
• b. 4 mA
• c. 5 mA
• d. 6 mA

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

30. An example of an instrumentation circuit is a(n) _____.

• a. dc voltmeter
• b. display driver
• c. ac voltmeter
• d. All of the above

31. This circuit is an example of a(n)________.

• a. dc voltmeter
• b. display driver
• c. instrumentation amplifier
• d. None of the above

32. Calculate the cut-off frequency of a first-order low-pass filter for R1 = 2.5 kâ„¦ and C1 = 0.05 Î¼F.

• a. 1.273 kHz
• b. 12.73 kHz
• c. 127.3 kHz
• d. 127.30 Hz

33. Calculate the cutoff frequencies of a bandpass filter with R1 = R2 = 5 kâ„¦ and C1 = C2 = 0.1 Î¼F.

• 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

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

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

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

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

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

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

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

6. The voltage gain of a voltage buffer is _____ .

• A. 1
• B. 0
• C. –1
• D. –5

7. The output voltage of a voltage buffer is _____ with the input voltage.

• A. in phase
• B. 45Âº out of phase
• C. 90Âº out of phase
• D. 180Âº out of phase

8. The input impedance of a voltage buffer is _____.

• A. very low
• B. low
• C. high
• D. very high

9. The output impedance of a voltage buffer is _____.

• A. very low
• B. low
• C. high
• D. very high

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

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

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

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. 45Âº out of phase
• C. 90Âº out of phase
• D. 180Âº out of phase

14. Op-amp circuits are used in _____ voltmeters.

• A. only dc
• B. only ac
• C. both ac and dc
• D. neither ac nor dc

15. In a current-controlled current source, the controlled current Io depends on _____.

• A. I1
• B. R1
• C. R2
• D. All of the above

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

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

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

19. A(n) _____ is not a component of a passive filter.

• A. op-amp
• B. capacitor
• C. inductor
• D. resistor

20. An active circuit is composed of a(n) _____.

• A. resistor
• B. capacitor
• C. op-amp
• D. All of the above

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

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

23. The roll-off for a first-order high-pass filter is _____.

• B. –6 dB/octave
• C. either –20 dB/decade or –6 dB/octave
• D. None of the above

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

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

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