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.
Start Practice Exam Test Questions
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.
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