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Amplifiers – Gibilisco MCQs in Electronics

(Last Updated On: December 8, 2017)

Multiple choice questions in Amplifiers

This is the Multiple Choice Questions (MCQs) in Chapter 24: Amplifiers from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Start Practice Exam Test Questions

1. The decibel is a unit of:

  • A. Relative signal strength.
  • B. Voltage.
  • C. Power.
  • D. Current.

2. If a circuit has a voltage-amplification factor of 20, then the voltage gain is:

  • A. 13 dB.
  • B. 20 dB.
  • C. 26 dB.
  • D. 40 dB.

3. A gain of -15 dB in a circuit means that:

  • A. The output signal is stronger than the input.
  • B. The input signal is stronger than the output.
  • C. The input signal is 15 times as strong as the output.
  • D. The output signal is 15 times as strong as the input.

4. A device has a voltage gain of 23 dB. The input voltage is 3.3 V. The output voltage is:

  • A. 76 V.
  • B. 47 V.
  • C. 660 V.
  • D. Not determinable from the data given.

5. A power gain of 44 dB is equivalent to an output/input power ratio of:

  • A. 44.
  • B. 160.
  • C. 440.
  • D. 25,000.

6. A resistor between the base of an NPN bipolar transistor and the positive supply voltage is used to:

  • A. Provide proper bias.
  • B. Provide a path for the input signal.
  • C. Provide a path for the output signal.
  • D. Limit the collector current.

7. The capacitance values in an amplifier circuit depend on:

  • A. The supply voltage.
  • B. The polarity.
  • C. The signal strength.
  • D. The signal frequency.

8. A class-A circuit would not work well as:

  • A. A stereo hi-fi amplifier.
  • B. A television transmitter PA.
  • C. A low-level microphone preamplifier.
  • D. The first stage in a radio receiver.

9. In which of the following FET amplifier types does drain current flow for 50 percent of the signal cycle?

  • A. Class A.
  • B. Class AB1.
  • C. Class AB2.
  • D. Class B.

10. Which of the following amplifier types produces the least distortion of the signal waveform?

  • A. Class A.
  • B. Class AB1.
  • C. Class AB2.
  • D. Class B.

11. Which bipolar amplifier type has some distortion in the signal wave, with collector current during most, but not all, of the cycle?

  • A. Class A.
  • B. Class AB1.
  • C. Class AB2.
  • D. Class B.

12. How can a class-B amplifier be made suitable for hi-fi audio applications?

  • A. By increasing the bias.
  • B. By using two transistors in push-pull.
  • C. By using tuned circuits in the output.
  • D. A class-B amplifier cannot work well for hi-fi audio.

13. How can a class-C amplifier be made linear?

  • A. By reducing the bias.
  • B. By increasing the drive.
  • C. By using two transistors in push-pull.
  • D. A class-C amplifier cannot be made linear.

14. Which of the following amplifier classes generally needs the most driving power?

  • A. Class A.
  • B. Class AB1.
  • C. Class AB2.
  • D. Class B.

15. A graphic equalizer is a form of:

  • A. Bias control.
  • B. Gain control.
  • C. Tone control.
  • D. Frequency control.

16. A disadvantage of transfer coupling, as opposed to capacitive coupling, is that:

  • A. Transformers can’t match impedances.
  • B. Transformers can’t work above audio frequencies.
  • C. Transformers cost more.
  • D. Transformers reduce the gain.

17. A certain bipolar-transistor PA is 66 percent efficient. The output power is 33 W. The dc collector power input is:

  • A. 22 W.
  • B. 50 W.
  • C. 2.2 W.
  • D. None of the above.

18. A broadband PA is:

  • A. Generally easy to use.
  • B. More efficient than a tuned PA.
  • C. Less likely than a tuned PA to amplify unwanted signals.
  • D. Usable only at audio frequencies.

19. A tuned PA must always be:

  • A. Set to work over a wide range of frequencies.
  • B. Adjusted for maximum power output.
  • C. Made as efficient as possible.
  • D. Operated in class C.

20. A loading control in a tuned PA:

  • A. Provides an impedance match between the bipolar transistor or FET and the load.
  • B. Allows broadband operation.
  • C. Adjusts the resonant frequency.
  • D. Controls the input impedance.

Complete List of Multiple Choice Questions from this Book

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