# Malvino: MCQ in Common Collector and Common Base Amplifiers

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 11: Common Collector and Common Base 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

• MCQs in Common Collector Amplifier
• MCQs in Output Impedance
• MCQs in Cascading Common Emitter and Common Collector
• MCQs in Darlington Connections
• MCQs in Voltage Regulation
• MCQs in Common Base Amplifier

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. For class B operation, the collector current flows

• a. The whole cycle
• b. Half the cycle
• c. Less than half a cycle
• d. Less than a quarter of a cycle

2. Transformer coupling is an example of

• a. Direct coupling
• b. AC coupling
• c. DC coupling
• d. Impedance coupling

3. An audio amplifier operates in the frequency range of

• a. 0 to 20 Hz
• b. 20 Hz to 20 kHz
• c. 20 to 200 kHz
• d. Above 20 kHz

4. A tuned RF amplifier is

• a. Narrowband
• b. Wideband
• c. Direct coupled
• d. Impedance coupled

5. The first stage of a preamp is

• a. A tuned RF stage
• b. Large signal
• c. Small signal
• d. A dc amplifier

6. For maximum peak-to-peak output voltage, the Q point should be

• a. Near saturation
• b. Near cutoff
• c. At the center of the dc load line
• d. At the center of the ac load line

7. An amplifier has two load lines because

• a. It has ac and dc collector resistances
• b. It has two equivalent circuits
• c. DC acts one way and ac acts another
• d. All of the above

8. When the Q point is at the center of the ac load line, the maximum peak-to-peak output voltage equals

• a. VCEQ
• b. 2VCEQ
• c. ICQ
• d. 2IcQ

9. Push-pull is almost always used with

• a. Class A
• b. Class B
• c. Class C
• d. All of the above

10. One advantage of a class B push-pull amplifier is

• a. Very small quiescent current drain
• b. Maximum efficiency of 78.5 percent
• c. Greater efficiency than class A
• d. All of the above

11. Class C amplifiers are almost always

• a. Transformer-coupled between stages
• b. Operated at audio frequencies
• c. Tuned RF amplifiers
• d. Wideband

12. The input signal of a class C amplifier

• a. Is negatively clamped at the base
• b. Is amplified and inverted
• c. Produces brief pulses of collector current
• d. All of the above

13. The collector current of a class C amplifier

• a. Is an amplified version of the input voltage
• b. Has harmonics
• c. Is negatively clamped
• d. Flows for half a cycle

14. The bandwidth of a class C amplifier decreases when the

• a. Resonant frequency increases
• b. Q increases
• c. XL decreases

15. The transistor dissipation in a class C amplifier decreases when the

• a. Resonant frequency increases
• b. coil Q increases
• d. Capacitance increases

16. The power rating of a transistor can be increased by

• a. Raising the temperature
• b. Using a heat sink
• c. Using a derating curve
• d. Operating with no input signal

17. The ac load line is the same as the dc load line when the ac collector resistance equals the

• a. DC emitter resistance
• b. AC emitter resistance
• c. DC collector resistance
• d. Supply voltage divided by collector current

18. If RC = 3.6 kohm and RL = 10 kohm, the ac load resistance equals

• a. 10 kohm
• b. 2.65 kohm
• c. I kohm
• d. 3.6 kohm

19. The quiescent collector current is the same as the

• a. DC collector current
• b. AC collector current
• c. Total collector current
• d. Voltage-divider current

20. The ac load line usually

• a. Equals the dc load line
• b. Has less slope than the dc load line
• c. Is steeper than the dc load line
• d. Is horizontal

21. For a Q point near the center of the dc load line, clipping is more likely to occur on the

• a. Positive peak of input voltage
• b. Negative peak of output voltage
• c. Positive peak of output voltage
• d. Negative peak of emitter voltage

22. In a class A amplifier, the collector current flows for

• a. Less than half the cycle
• b. Half the cycle
• c. Less than the whole cycle
• d. The entire cycle

23. With class A, the output signal should be

• a. Unclipped
• b. Clipped on positive voltage peak
• c. Clipped on negative voltage peak
• d. Clipped on negative current peak

24. The instantaneous operating point swings-along the

25. The current drain of an amplifier is the

• a. Total ac current from the generator
• b. Total dc current from the supply
• c. Current gain from base to collector
• d. Current gain from collector to base

26. The power gain of an amplifier

• a. Is the same as the voltage gain
• b. Is smaller than the voltage gain
• c. Equals output power divided by input power

27. Heat sinks reduce the

• a. Transistor power
• b. Ambient temperature
• c. Junction temperature
• d. Collector current

28. When the ambient temperature increases, the maximum transistor power rating

• a. Decreases
• b. Increases
• c. Remains the same
• d. None of the above

29. If the load power is 3 mW and the dc power is 150 mW, the efficiency is

• a. 0
• b. 2 percent
• c. 3 percent
• d. 20 percent

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

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