# MCQs in AC Models

Multiple Choice Questions in AC Models from the book Electronic Principles by Albert Malvino. Make sure to familiarize each and every questions

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

### Begin and Good luck!

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

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

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