Field-Effect Transistors (FET) MCQ (Part-1)

Posted by

Field-Effect Transistors (FET) MCQ

Field-Effect Transistors (FET) MCQ, GATE Questions on Field-Effect Transistors (FET), Multiple Choice Questions and Answers on FET, FET(Field Effect Transistors) MCQ Questions & Answers, Field Effect Transistor (FET) multiple-choice questions, Junction Field Effect Transistor Questions, and Answers, Field Effect Transistor – FET MCQ, Engineering MCQ

Multiple-Choice Questions

Q.1. A JFET has three terminals, namely …….

  • cathode, anode, grid
  • emitter, base, collector
  • source, gate, drain
  • none of the above

Answer: source, gate, drain

Q.2. A JFET is similar in operation to ……. valve.

  • diode
  • pentode
  • triode
  • tetrode

Answer: pentode

Q.3. A JFET is also called ……. transistor.

  • unipolar
  • bipolar
  • unijunction
  • none of the above

Answer: unipolar

Q.4. A JFET is a ……. driven device.

  • current
  • voltage
  • both current and voltage
  • none of the above

Answer: voltage

Q.5. The gate of a JFET is ……. biased.

  • reverse
  • forward
  • reverse as well as forward
  • none of the above

Answer: reverse

Q.6. The input impedance of a JFET is ……. that of an ordinary transistor.

  • equal to
  • less than
  • more than
  • none of the above

Answer: more than

Q.7. In a p-channel JFET, the charge carriers are…….

  • electrons
  • holes
  • both electrons and holes
  • none of the above

Answer: holes

Q.8. When drain voltage equals the pinch-off voltage, then drain current ……. with the increase in drain voltage.

  • decreases
  • increases
  • remains constant
  • none of the above

Answer: remains constant

Q.9. If the reverse bias on the gate of a JFET is increased, then width of the conducting channel …….

  • is decreased
  • is increased
  • remains the same
  • none of the above

Answer: is decreased

Q.10. A MOSFET has ……. terminals.

  • two
  • five
  • four
  • three

Answer: three

Q.11. A MOSFET can be operated with …….

  • negative gate voltage only
  • positive gate voltage only
  • positive as well as negative gate voltage
  • none of the above

Answer: positive as well as negative gate voltage

Q.12. A JFET has ……. power gain.

  • small
  • very high
  • very small
  • none of the above

Answer: very high

Q.13. The input control parameter of a JFET is …….

  • gate voltage
  • source voltage
  • drain voltage
  • gate current

Answer: gate voltage

Q.14. A common base configuration of a pnp transistor is analogous to ……. of a JFET.

  • common source configuration
  • common drain configuration
  • common gate configuration
  • none of the above

Answer: common gate configuration

Q.15. A JFET has high input impedance because …….

  • it is made of semiconductor material
  • input is reverse biased
  • of impurity atoms
  • none of the above

Answer: input is reverse biased

Q.16. In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers …….

  • almost touch each other
  • have large gap
  • have moderate gap
  • none of the above

Answer: almost touch each other

Q.17. In a JFET, IDSS is known as …………..

  • drain to source current
  • drain to source current with gate shorted
  • drain to source current with gate open
  • none of the above

Answer: drain to source current with gate shorted

Q.18. The two important advantages of a JFET are …………..

  • high input impedance and square-law property
  • inexpensive and high output impedance
  • low input impedance and high output impedance
  • none of the above

Answer: high input impedance and square-law property

Q.19. ………….. has the lowest noise-level.

  • triode
  • ordinary transistor
  • tetrode
  • JFET

Answer: JFET

Q.20. A MOSFET is sometimes called ……. JFET.

  • many gate
  • open gate
  • insulated gate
  • shorted gate

Answer: insulated gate

Q.21. Which of the following devices has the highest input impedance ?

  • JFET
  • MOSFET
  • crystal diode
  • ordinary transistor

Answer: MOSFET

Q.22. A MOSFET uses the electric field of a ……. to control the channel current.

  • capacitor
  • battery
  • generator
  • none of the above

Answer: capacitor

Q.23. The pinch-off voltage in a JFET is analogous to ……. voltage in a vacuum tube.

  • anode
  • cathode
  • grid cut off
  • none of the above

Answer: grid cut off

Q.24. The formula for a.c. drain resistance of a JFET is …………..

  • \frac{\Delta V_{DS}}{\Delta I_{D}} at constant VGS
  • \frac{\Delta V_{DS}}{\Delta I_{D}} at constant VDS
  • \frac{\Delta I_{D}}{\Delta V_{GS}} at constant VDS
  • \frac{\Delta I_{D}}{\Delta V_{DS}} at constant VGS

Answer: \frac{\Delta V_{DS}}{\Delta I_{D}} at constant VGS

Q.25. In class A operation, the input circuit of a JFET is …………. biased.

  • forward
  • reverse
  • not
  • none of the above

Answer: reverse

Field-Effect Transistors (FET) MCQ (Part-2)

Leave a Reply

Your email address will not be published. Required fields are marked *