Field Effect Transistors (FET, MOSFET) — MCQs – EE

1. The term FET stands for:
(A) Field Emission Transistor
(B) Field Effect Transistor
(C) Field Electronic Transistor
(D) Field Energy Transistor

2. FETs are classified as:
(A) Bipolar devices
(B) Unipolar devices
(C) Optical devices
(D) Dual-carrier devices

3. The current in an FET is controlled by:
(A) Base current
(B) Gate voltage
(C) Collector voltage
(D) Emitter current

4. The three terminals of a JFET are:
(A) Source, Gate, Drain
(B) Emitter, Base, Collector
(C) Anode, Cathode, Gate
(D) Source, Drain, Base

5. The channel in a JFET can be made of:
(A) Only N-type material
(B) Only P-type material
(C) Either N-type or P-type material
(D) Both N and P together

6. In an n-channel JFET, the majority charge carriers are:
(A) Holes
(B) Electrons
(C) Ions
(D) Neutrons

7. The gate of a JFET is:
(A) Forward biased
(B) Reverse biased
(C) Unbiased
(D) Shorted to source

8. The region where the JFET conducts maximum current is called:
(A) Cutoff region
(B) Saturation region
(C) Ohmic region
(D) Pinch-off region

9. The drain current in a JFET becomes constant in:
(A) Cutoff region
(B) Ohmic region
(C) Saturation region
(D) Breakdown region

10. The voltage at which the JFET channel is completely closed is called:
(A) Breakdown voltage
(B) Threshold voltage
(C) Pinch-off voltage
(D) Cutoff voltage

11. The input impedance of a JFET is:
(A) Very low
(B) Very high
(C) Moderate
(D) Zero

12. A MOSFET stands for:
(A) Metal Oxide Semiconductor Field Effect Transistor
(B) Metallic Oxide Silicon Field Effect Transistor
(C) Metal Oxide Source Field Effect Transistor
(D) Metal Oxide Signal Field Effect Transistor

13. The MOSFET has how many terminals?
(A) Two
(B) Three
(C) Four
(D) Five

14. The terminals of a MOSFET are:
(A) Source, Drain, Gate, Body
(B) Source, Base, Collector, Emitter
(C) Anode, Cathode, Gate, Drain
(D) Source, Drain, Gate, Collector

15. The insulating layer in a MOSFET is made of:
(A) Silicon Dioxide
(B) Germanium
(C) Silicon Nitride
(D) Copper

16. The two main types of MOSFETs are:
(A) Depletion type and Enhancement type
(B) N-type and P-type
(C) Forward and Reverse type
(D) Positive and Negative type

17. In an n-channel enhancement MOSFET, the channel is formed when:
(A) A negative gate voltage is applied
(B) A positive gate voltage is applied
(C) No voltage is applied
(D) Source is grounded

18. In a p-channel enhancement MOSFET, the channel is formed when:
(A) A positive gate voltage is applied
(B) A negative gate voltage is applied
(C) Gate is shorted to drain
(D) Source is floating

19. The MOSFET gate draws:
(A) High current
(B) Moderate current
(C) Almost zero current
(D) Negative current

20. The input impedance of a MOSFET is:
(A) Low
(B) Moderate
(C) Very high
(D) Infinite

21. The drain current in a MOSFET is controlled by:
(A) Base current
(B) Gate-to-source voltage
(C) Drain-to-gate voltage
(D) Collector current

22. The MOSFET operates in the linear region when:
(A) It is fully on
(B) It acts as a resistor
(C) It acts as a current source
(D) It is fully off

23. The MOSFET operates in the saturation region when:
(A) It acts as a voltage-controlled current source
(B) It acts as a resistor
(C) It is off
(D) It is in breakdown

24. The body terminal in a MOSFET is usually connected to:
(A) Gate
(B) Drain
(C) Source
(D) Ground

25. Which of the following FETs has the highest input impedance?
(A) JFET
(B) Depletion MOSFET
(C) Enhancement MOSFET
(D) All are equal

26. The main advantage of MOSFETs over BJTs is:
(A) Higher gain
(B) Higher input impedance and low power consumption
(C) Simpler biasing
(D) Lower cost

27. The symbol of an enhancement-type MOSFET is distinguished by:
(A) A solid line for the channel
(B) A broken line for the channel
(C) A circle around the gate
(D) A grounded source

28. The symbol of a depletion-type MOSFET is distinguished by:
(A) A solid line for the channel
(B) A broken line for the channel
(C) A curved arrow
(D) No channel line

29. The FET that can be operated with zero gate bias is:
(A) Enhancement MOSFET
(B) Depletion MOSFET
(C) JFET
(D) Both (B) and (C)

30. MOSFETs are widely used in:
(A) Digital integrated circuits
(B) Audio amplifiers only
(C) Rectifiers
(D) Thermistors