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