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
- d. Load resistance decreases
15. The transistor dissipation in a class C amplifier decreases when the
- a. Resonant frequency increases
- b. coil Q increases
- c. Load resistance decreases
- 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
- a. AC load line
- b. DC load line
- c. Both load lines
- d. Neither load line
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
- d. Equals load 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
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