Gibilisco: MCQ in The Field Effect Transistor | ECE Board Exam

(Last Updated On: March 16, 2020)

Multiple choice questions in Field Effect Transistor

This is the Multiple Choice Questions (MCQs) in Chapter 23: The Field Effect Transistor from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

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1. The current through the channel of a JFET is directly affected by all of the following except:

  • A. Drain voltage.
  • B. Transconductance.
  • C. Gate voltage.
  • D. Gate bias.

2. In an N-channel JFET, pinchoff occurs when the gate bias is:

  • A. Slightly positive.
  • B. Zero.
  • C. Slightly negative.
  • D. Very negative.

3. The current consists mainly of holes when a JFET:

  • A. Has a P-type channel.
  • B. Is forward-biased.
  • C. Is zero-biased.
  • D. Is reverse-biased.

4. A JFET might work better than a bipolar transistor in:

  • A. A rectifier.
  • B. A radio receiver.
  • C. A filter.
  • D. A transformer.

5. In a P-channel JFET:

  • A. The drain is forward-biased.
  • B. The gate-source junction is forward biased.
  • C. The drain is negative relative to the source.
  • D. The gate must be at dc ground.

6. A JFET is sometimes biased at or beyond pinchoff in:

  • A. A power amplifier.
  • B. A rectifier.
  • C. An oscillator.
  • D. A weak-signal amplifier.

7. The gate of a JFET has:

  • A. Forward bias.
  • B. High impedance.
  • C. Low reverse resistance.
  • D. Low avalanche voltage.

8. A JFET circuit essentially never has:

  • A. A pinched-off channel.
  • B. Holes as the majority carriers.
  • C. A forward-biased P-N junction.
  • D. A high-input impedance.

9. When a JFET is pinched off:

  • A. dID/dEG is very large with no signal.
  • B. dID/dEG might vary considerably with no signal.
  • C. dID/dEG is negative with no signal.
  • D. dID/dEG is zero with no signal.

10. Transconductance is the ratio of:

  • A. A change in drain voltage to a change in source voltage.
  • B. A change in drain current to a change in gate voltage.
  • C. A change in gate current to a change in source voltage.
  • D. A change in drain current to a change in drain voltage.

11. Characteristic curves for JFETs generally show:

  • A. Drain voltage as a function of source current.
  • B. Drain current as a function of gate current.
  • C. Drain current as a function of drain voltage.
  • D. Drain voltage as a function of gate current.

12. A disadvantage of a MOS component is that:

  • A. It is easily damaged by static electricity.
  • B. It needs a high input voltage.
  • C. It draws a large amount of current.
  • D. It produces a great deal of electrical noise.

13. The input impedance of a MOSFET:

  • A. Is lower than that of a JFET.
  • B. Is lower than that of a bipolar transistor.
  • C. Is between that of a bipolar transistor and a JFET.
  • D. Is extremely high.

14. An advantage of MOSFETs over JFETs is that:

  • A. MOSFETs can handle a wider range of gate voltages.
  • B. MOSFETs deliver greater output power.
  • C. MOSFETs are more rugged.
  • D. MOSFETs last longer.

15. The channel in a zero-biased JFET is normally:

  • A. Pinched off.
  • B. Somewhat open.
  • C. All the way open.
  • D. Of P-type semiconductor material.

16. When an enhancement-mode MOSFET is at zero bias:

  • A. The drain current is high with no signal.
  • B. The drain current fluctuates with no signal.
  • C. The drain current is low with no signal.
  • D. The drain current is zero with no signal.

17. An enhancement-mode MOSFET can be recognized in schematic diagrams by:

  • A. An arrow pointing inward.
  • B. A broken vertical line inside the circle.
  • C. An arrow pointing outward.
  • D. A solid vertical line inside the circle.

18. In a source follower, which of the electrodes of the FET receives the input signal?

  • A. None of them.
  • B. The source.
  • C. The gate.
  • D. The drain.

19. Which of the following circuits has its output 180 degrees out of phase with its input?

  • A. Common source.
  • B. Common gate.
  • C. Common drain.
  • D. All of them.

20. Which of the following circuits generally has the greatest gain?

  • A. Common source.
  • B. Common gate.
  • C. Common drain.
  • D. It depends only on bias, not on which electrode is grounded.

Complete List of Multiple Choice Questions from this Book

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