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Floyd: MCQ in FET Amplifiers and Switching Circuits

(Last Updated On: August 23, 2019)

MCQ for FET Amplifiers and Switching Circuits

This is the Multiple Choice Questions in FET Amplifiers and Switching Circuits from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. 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.

Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. A common-drain amplifier is similar in configuration to which BJT amplifier?

A. common-emitter

B. common-collector

C. common-base

D. common-gate

View Answer:

Answer: Option B

Solution:

2. A common-source amplifier is similar in configuration to which BJT amplifier?

A. common-base

B. common-collector

C. common-emitter

D. emitter-follower

View Answer:

Answer: Option C

Solution:

3. A common-gate amplifier is similar in configuration to which BJT amplifier?

A. common-emitter

B. common-collector

C. common-base

D. emitter-follower

View Answer:

Answer: Option C

Solution:

4. In a common-source amplifier, the purpose of the bypass capacitor, C2, is to

A. keep the source effectively at ac ground.

B. provide a dc path to ground.

C. provide coupling to the input.

D. provide coupling to the load.

View Answer:

Answer: Option A

Solution:

5. Which FET amplifier(s) has (have) a phase inversion between input and output signals?

A. common-gate

B. common-drain

C. common-source

D. all of the above

View Answer:

Answer: Option C

Solution:

6. Input resistance of a common-drain amplifier is

A. RG || RIN(gate).

B. RG + RIN(gate).

C. RG.

D. RIN(gate).

View Answer:

Answer: Option A

Solution:

7. Refer to Figure 9-1. For midpoint biasing, ID would be

Floyd: MCQ in FET Amplifiers and Switching Circuits

Figure 9-1

A. 10 mA.

B. 7.5 mA.

C. 5 mA.

D. 2.5 mA.

View Answer:

Answer: Option C

Solution:

8. Refer to Figure 9-1. Find the value of VD.

A. 20 V

B. 11 V

C. 10 V

D. 9 V

View Answer:

Answer: Option D

Solution:

9. Refer to Figure 9-1. If VGS = –6 V, calculate the value of RS that will provide this value.

A. 2.2 kΩ

B. 1.2 kΩ

C. 600 kΩ

D. 100 kΩ

View Answer:

Answer: Option B

Solution:

10. Refer to Figure 9-1. The voltage gain is

A. 1.2.

B. 2.4.

C. 4.4.

D. 8.8.

View Answer:

Answer: Option D

Solution:

11. Refer to Figure 9-1. If Vin = 20 mV p-p what is the output voltage?

A. 176 mV p-p

B. 88 mV p-p

C. 48 mV p-p

D. 24 mV p-p

View Answer:

Answer: Option A

Solution:

12. Refer to Figure 9-1. If Vin = 1 V p-p, the output voltage Vout would be

A. undistorted.

B. clipped on the negative peaks.

C. clipped on the positive peaks.

D. 0 V p-p.

View Answer:

Answer: Option A

Solution:

13. Refer to Figure 9-2. If ID = 4 mA, IDSS = 16 mA, and VGS(off) = –8 V, find VDS.

Floyd: MCQ in FET Amplifiers and Switching Circuits

Figure 9-2

A. 19.2 V

B. –6 V

C. 10.8 V

D. 30 V

View Answer:

Answer: Option C

Solution:

14. Refer to Figure 9-2. If ID = 4 mA, find the value of VGS.

A. 10.8 V

B. 6 V

C. –0.7 V

D. –6 V

View Answer:

Answer: Option D

Solution:

15. Refer to Figure 9-2. If gm = 4000 mS and a signal of 75 mV rms is applied to the gate, calculate the p-p output voltage.

A. 990 mV

B. 1.13 V p-p

C. 2.8 V p-p

D. 990 V p-p

View Answer:

Answer: Option C

Solution:

16. Refer to Figure 9-2. The approximate value of Rin is

A. 100 MΩ.

B. 1.5 kΩ.

C. 3.3 kΩ.

D. 48 MΩ.

View Answer:

Answer: Option A

Solution:

17. Refer to Figure 9-3. If C4 opened, the signal voltage at the drain of Q1 would

Floyd: MCQ in FET Amplifiers and Switching Circuits

Figure 9-3

A. increase.

B. decrease.

C. remain the same.

D. distort.

View Answer:

Answer: Option C

Solution:

18. Refer to Figure 9-3. If R7 were to decrease in value, Vout would

A. increase.

B. decrease.

C. remain the same.

D. distort.

View Answer:

Answer: Option B

Solution:

19. Refer to Figure 9-3. If C2 shorted, Vout would

A. increase.

B. decrease.

C. remain the same.

D. distort.

View Answer:

Answer: Option D

Solution:

20.Refer to Figure 9-3. If Vin was increased in amplitude a little, the signal voltage at the source of Q2 would

A. increase.

B. decrease.

C. remain the same.

D. distort.

View Answer:

Answer: Option C

Solution:

21. Refer to Figure 9-3. If R6 opened, the signal at the drain of Q1 would

A. increase.

B. decrease.

C. remain the same.

D. distort.

View Answer:

Answer: Option C

Solution:

22. A JFET cascade amplifier employs

A. 2 common-gate amplifiers.

B. 2 common-source amplifiers.

C. 1 common-gate and 1 common-source amplifier.

D. 1 common-gate and 1 common-drain amplifier.

View Answer:

Answer: Option C

Solution:

23. The theoretical efficiency of a class D amplifier is

A. 75%.

B. 85%.

C. 90%.

D. 100%.

View Answer:

Answer: Option D

Solution:

24. The input resistance at the gate of a FET is extremely

A. high.

B. low.

C. 0

D. infinite

View Answer:

Answer: Option A

Solution:

25. There is a _____° phase inversion between gate and source in a source follower.

A. 0

B. 90

C. 180

D. none of the above

View Answer:

Answer: Option A

Solution:

26. What is the input resistance (Rin(source)) of a common-gate amplifier?

A. Rs

B. (1/gm)||Rs

C. 1/gm

D. none of the above

View Answer:

Answer: Option C

Solution:

27. Which type of FETs can operate with a gate-to-source Q-point value of 0 V?

A. JFET

B. E-MOSFET

C. D-MOSFET

D. none of the above

View Answer:

Answer: Option C

Solution:

28. What common factor determines the voltage gain and input resistance of a common-gate amplifier?

A. RD

B. RL

C. gm

D. none of the above

View Answer:

Answer: Option C

Solution:

29. The class D amplifier uses what type of transistors?

A. JFETs

B. BJTs

C. MOSFETs

D. any of the above

View Answer:

Answer: Option C

Solution:

30. Class D amplifiers differ from all other classes of amplifiers because

A. the output transistors are operated as switches.

B. of their very low input capacitance.

C. of their high-frequency response capabilities.

D. they employ dual MOSFETs.

View Answer:

Answer: Option A

Solution:

31. E-MOSFETs are generally used in switching applications because

A. of their very low input capacitance.

B. of their threshold characteristic (VGS(th)).

C. of their high-frequency response capabilities.

D. of their power handling.

View Answer:

Answer: Option B

Solution:

32. What limits the signal amplitude in an analog MOSFET switch?

A. the switch input capacitance

B. VGS(th)

C. the switch’s power handling

D. VDS

View Answer:

Answer: Option B

Solution:

33. MOSFET digital switching is used to produce which digital gates?

A. inverters

B. NOR gates

C. NAND gates

D. all of the above

View Answer:

Answer: Option D

Solution:

34. CMOS digital switches use

A. n-channel and p-channel D-MOSFETs in series.

B. n-channel and p-channel D-MOSFETs in parallel.

C. n-channel and p-channel E-MOSFETs in series.

D. n-channel and p-channel E-MOSFETs in parallel.

View Answer:

Answer: Option C

Solution:

35. MOSFETs make better power switches than BJTs because they have

A. lower turn-off times.

B. lower on-state resistance.

C. a positive temperature coefficient.

D. all of the above

View Answer:

Answer: Option B

Solution:

TRUE/FALSE:

1. The voltage gain of a common-source amplifier is found by the product of gm and Rd.

A. True

B. False

View Answer:

Answer: Option A

Solution:

2. There is no phase inversion between the gate and the drain voltages.

A. True

B. False

View Answer:

Answer: Option B

Solution:

3. There is a 180º phase inversion between the gate and source voltages.

A. True

B. False

View Answer:

Answer: Option B

Solution:

4. A load resistance connected to the output of an amplifier reduces the voltage gain.

A. True

B. False

View Answer:

Answer: Option A

Solution:

5. Bypassing a source resistor reduces the voltage gain.

A. True

B. False

View Answer:

Answer: Option B

Solution:

6. Generally, higher voltage gains can be achieved with bipolar amplifiers than with FET amplifiers.

A. True

B False

View Answer:

Answer: Option A

Solution:

7. The common-drain amplifier is also called a source-follower.

A. True

B. False

View Answer:

Answer: Option A

Solution:

8. The common-gate configuration has extremely high input resistance.

A. True

B. False

View Answer:

Answer: Option B

Solution:

9. The common-source configuration has extremely high input resistance.

A. True

B. False

View Answer:

Answer: Option A

Solution:

10. The common-drain configuration has extremely high input resistance.

A. True

B. False

View Answer:

Answer: Option A

Solution:

11. In a class D amplifier, the output transistors are operated in a nonlinear mode.

A. True

B. False

View Answer:

Answer: Option A

Solution:

12. Class D amplifier efficiencies can reach practical levels of more than 90%.

A. True

B. False

View Answer:

Answer: Option A

Solution:

13. In a class D amplifier, the low-pass filter comes directly after the pulse-width modulator.

A. True

B. False

View Answer:

Answer: Option B

Solution:

14. In an analog MOSFET switch, the input is applied to the gate and the output is taken from the source.

A. True

B. False

View Answer:

Answer: Option B

Solution:

15. Digital MOSFET switches are used in the sample-and-hold circuit of an analog-to-digital converter.

A. True

B. False

View Answer:

Answer: Option B

Solution:

Check your work.

Complete List of Chapter MCQ in Floyd’s Electronic Devices

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