# Malvino: MCQ in Operational Amplifiers

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 18: Operational Amplifiers from the book Electronic Principles 7th Edition by Albert Malvino. 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.

### Topic Outline

• MCQ in Introduction to Operational Amplifiers
• MCQ in 741 Op Amp
• MCQ in Inverting Amplifier
• MCQ in Non-inverting Amplifier
• MCQ in two Op Amp Appplications
• MCQ in Linear ICs
• MCQ in Op Amp as Surface-Mount Devices

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. What usually controls the open-loop cutoff frequency of an op amp?

• a. Stray-wiring capacitance
• b. Base-emitter capacitance
• c. Collector-base capacitance
• d. Compensating capacitance

2. A compensating capacitor prevents

• a. Voltage gain
• b. Oscillations
• c. Input offset current
• d. Power bandwidth

3. At the unity-gain frequency, the open-loop voltage gain is

• a. 1
• b. Amid
• c. Zero
• d. Very large

4. The cutoff frequency of an op amp equals the unity-gain frequency divided by

• a. the cutoff frequency
• b. Closed-loop voltage gain
• c. Unity
• d. Common-mode voltage gain

5. If the cutoff frequency is 15 Hz and the midband open-loop voltage gain is 1,000,000, the unity-gain frequency is

• a. 25 Hz
• b. 1 MHz
• c. 1.5 MHz
• d. 15 MHz

6. If the unity-gain frequency is 5 MHz and the midband open loop voltage gain is 200,000, the cutoff frequency is

• a. 25 Hz
• b. 1 MHz
• c. 1.5 MHz
• d. 15 MHz

7. The initial slope of a sine wave is directly proportional to

• a. Slew rate
• b. Frequency
• c. Voltage gain
• d. Capacitance

8. When the initial slope of a sine wave is greater than the slew rate,

• a. Distortion occurs
• b. Linear operation occurs
• c. Voltage gain is maximum
• d. The op amp works best

9. The power bandwidth increases when

• a. Frequency decreases
• b. Peak value decreases
• c. Initial slope decreases
• d. Voltage gain increases

10. A 741C uses

• a. Discrete resistors
• b. Inductors
• d. A large coupling capacitor

11. A 741C cannot work without

• a. Discrete resistors
• c. Dc return paths on the two bases
• d. A small coupling capacitor

12. The input impedance of a BIFET op amp is

• a. Low
• b. Medium
• c. High
• d. Extremely high

13. An LF157A is a

• a. Diff amp
• b. Source follower
• c. Bipolar op amp
• d. BIFET op amp

14. If the two supply voltages are plus and minus 15 V, the MPP value of an op amp is closest to

• a. 0
• b. +15V
• c. -15 V
• d. 30 V

15. The open-loop cutoff frequency of a 741C is controlled by

• a. A coupling capacitor
• b. The output short circuit current
• c. The power bandwidth
• d. A compensating capacitor

16. The 741C has a unity-gain frequency of

• a. 10 Hz
• b. 20 kHz
• c. 1 MHz
• d. 15 MHz

17. The unity-gain frequency equals the product of closed-loop voltage gain and the

• a. Compensating capacitance
• b. Tail current
• c. Closed-loop cutoff frequency

18. If the unity frequency is 10 MHz and midband open-loop voltage gain is 1,000,000, then the open-loop cutoff frequency of the op amp is

• a. 10 Hz
• b. 20 Hz
• c. 50 Hz
• d. 100 Hz

19. The initial slope of a sine wave increases when

• a. Frequency decreases
• b. Peak value increases
• c. Cc increases
• d. Slew rate decreases

20. If the frequency is greater than the power bandwidth,

• a. Slew-rate distortion occurs
• b. A normal output signal occurs
• c. Output offset voltage increases
• d. Distortion may occur

21. An op amp has an open base resistor. The output voltage will be

• a. Zero
• b. Slightly different from zero
• c. Maximum positive or negative
• d. An amplified sine wave

22. An op amp has a voltage gain of 500,000. If the output voltage is 1 V, the input voltage is

• a. 2 microvolts
• b. 5 mV
• c. 10 mV
• d. 1 V

23. A 741C has supply voltages of plus and minus 15 V. If the load resistance is large, the MPP value is

• a. 0
• b. +15 V
• c. 27 V
• d. 30 V

24. Above the cutoff frequency, the voltage gain of a 741C decreases approximately

• a. 10 dB per decade
• b. 20 dB per octave
• c. 10 dB per octave
• d. 20 dB per decade

25. The voltage gain of an op amp is unity at the

• a. Cutoff frequency
• b. Unity-gain frequency
• c. Generator frequency
• d. Power bandwidth

26. When slew-rate distortion of a sine wave occurs, the output

• a. Is larger
• b. Appears triangular
• c. Is normal
• d. Has no offset

27. A 741C has

• a. A voltage gain of 100,000
• b. An input impedance of 2 Mohm
• c. An output impedance of 75 ohm
• d. All of the above

28. The closed-loop voltage gain of an inverting amplifier equals

• a. The ratio of the input resistance to the feedback resistance
• b. The open-loop voltage gain
• c. The feedback resistance divided by the input resistance
• d. The input resistance

29. The non-inverting amplifier has a

• a. Large closed-loop voltage gain
• b. Small open-loop voltage gain
• c. Large closed-loop input impedance
• d. Large closed-loop output impedance

30. The voltage follower has a

• a. Closed-loop voltage gain of unity
• b. Small open-loop voltage gain
• c. Closed-loop bandwidth of zero
• d. Large closed-loop output impedance

31. A summing amplifier can have

• a. No more than two input signals
• b. Two or more input signals
• c. A closed-loop input impedance of infinity
• d. A small open-loop voltage gain

### Complete List of MCQ in Electronic Principles by Albert Malvino

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