# Malvino: MCQ in AC Models

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 9: AC Models 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 Base-Biased Amplifier
• MCQs in Emitter-Biased Amplifier
• MCQs in Small Signal Operation
• MCQs in AC Beta
• MCQs in AC Resistance of the Emitter Diode
• MCQs in Two Transistors Models
• MCQs in Analyzing an Amplifier
• MCQs in AC Quantities on the Data Sheet

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. For dc, the current in a coupling circuit is

• a. Zero
• b. Maximum
• c. Minimum
• d. Average

2. The current in a coupling circuit for high frequencies is

• a. Zero
• b. Maximum
• c. Minimum
• d. Average

3. A coupling capacitor is

• a. A dc short
• b. An ac open
• c. A dc open and an ac short
• d. A dc short and an ac open

4. In a bypass circuit, the top of a capacitor is

• a. An open
• b. A short
• c. An ac ground
• d. A mechanical ground

5. The capacitor that produces an ac ground is called a

• a. Bypass capacitor
• b. Coupling capacitor
• c. Dc open
• d. Ac open

6. The capacitors of a CE amplifier appear

• a. Open to ac
• b. Shorted to dc
• c. Open to supply voltage
• d. Shorted to ac

7. Reducing all dc sources to zero is one of the steps in getting the

• a. DC equivalent circuit
• b. AC equivalent circuit
• c. Complete amplifier circuit
• d. Voltage-divider biased circuit

8. The ac equivalent circuit is derived from the original circuit by shorting all

• a. Resistors
• b. Capacitors
• c. Inductors
• d. Transistors

9. When the ac base voltage is too large, the ac emitter current is

• a. Sinusoidal
• b. Constant
• c. Distorted
• d. Alternating

10. In a CE amplifier with a large input signal, the positive half cycle of the ac emitter current is

• a. Equal to the negative half cycle
• b. Smaller than the negative half cycle
• c. Larger than the negative half cycle
• d. Equal to the negative half cycle

11. Ac emitter resistance equals 25 mV divided by the

• a. Quiescent base current
• b. DC emitter current
• c. AC emitter current
• d. Change in collector current

12. To reduce the distortion in a CE amplifier, reduce the

• a. DC emitter current
• b. Base-emitter voltage
• c. Collector current
• d. AC base voltage

13. If the ac voltage across the emitter diode is 1 mV and the ac emitter current is 0.1 mA, the ac resistance of the emitter diode is

• a. 1 ohm
• b. 10 ohm
• c. 100 ohm
• d. 1 kohm

14. A graph of ac emitter current versus ac base-emitter voltage applies to the

• a. Transistor
• b. Emitter diode
• c. Collector diode
• d. Power supply

15. The output voltage of a CE amplifier is

• a. Amplified
• b. Inverted
• c. 180 degrees out of phase with the input
• d. All of the above

16. The emitter of a CE amplifier has no ac voltage because of the

• a. DC voltage on it
• b. Bypass capacitor
• c. Coupling capacitor
• d. Load resistor

17. The voltage across the load resistor of a CE amplifier is

• a. Dc and ac
• b. DC only
• c. AC only
• d. Neither dc nor ac

18. The ac collector current is approximately equal to the

• a. AC base current
• b. AC emitter current
• c. AC source current
• d. AC bypass current

19. The ac emitter current times the ac emitter resistance equals the

• a. Dc emitter voltage
• b. AC base voltage
• c. AC collector voltage
• d. Supply voltage

20. The ac collector current equals the ac base current times the

• a. AC collector resistance
• b. DC current gain
• c. AC current gain
• d. Generator voltage

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

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