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# Gibilisco: MCQ in Amplifiers | ECE Board Exam

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

Choose the letter of the best answer in each questions.

1. The decibel is a unit of:

A. Relative signal strength.

B. Voltage.

C. Power.

D. Current.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

15. A graphic equalizer is a form of:

A. Bias control.

B. Gain control.

C. Tone control.

D. Frequency control.

Solution:

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

A. Transformers canโt match impedances.

B. Transformers canโt work above audio frequencies.

C. Transformers cost more.

D. Transformers reduce the gain.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

A. Provides an impedance match between the bipolar transistor or FET and the load.

D. Controls the input impedance.

Solution:

### Topics Included in the Test from Chapter 19 to Chapter 30

Part 3: Basic Electronics
Chapter 24: MCQ in Amplifiers
Chapter 25: MCQ in Oscillators

### Complete List of Multiple Choice Questions from this Book

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