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Field Effect Transistors - FET

Study 47 Electrical Engineering MCQs with correct answers and explanations.

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31Electrical EngineeringMedium

When drain voltage equals the pinch-off-voltage, then drain current ________ with the increase in drain voltage?

Aincreases

Bremains constant

Cnone of the above

Ddecreases

Correct answer

B. remains constant

Explanation

The correct answer is remains constant.

32Electrical EngineeringMedium

The channel of a JFET is between the ________?

Ainput and output

Bdrain and source

Cgate and drain

Dgate and source

Correct answer

B. drain and source

Explanation

The correct answer is drain and source.

33Electrical EngineeringMedium

A n-channel D-MOSFET with a positive VGS is operating in ________?

Athe enhancement-mode

Bsaturation

Ccut off

Dthe depletion-mode

Correct answer

A. the enhancement-mode

Explanation

The correct answer is the enhancement-mode.

34Electrical EngineeringMedium

A JFET has ________ power gain?

Avery high

Bnone of the above

Csmall

Dvery small

Correct answer

A. very high

Explanation

The correct answer is very high.

35Electrical EngineeringMedium

If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ________?

Anone of the above

Bis decreased

Cis increased

Dremains the same

Correct answer

B. is decreased

Explanation

The correct answer is is decreased.

36Electrical EngineeringMedium

The output characteristics of a JFET closely resemble the output characteristics of a ________ valve?

Atriode

Bpentode

Ctetrode

Ddiode

Correct answer

B. pentode

Explanation

The correct answer is pentode.

37Electrical EngineeringMedium

If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ________?

Ais decreased

Bnone of the above

Cis increased

Dremains the same

Correct answer

C. is increased

Explanation

The correct answer is is increased.

38Electrical EngineeringMedium

A MOSFET can be operated with________?

Apositive gate voltage only

Bnone of the above

Cpositive as well as negative gate voltage

Dnegative gate voltage only

Correct answer

C. positive as well as negative gate voltage

Explanation

The correct answer is positive as well as negative gate voltage.

39Electrical EngineeringMedium

The gate of a JFET is ________ biased?

Anone of the above

Bforward

Creverse as well as forward

Dreverse

Correct answer

D. reverse

Explanation

The correct answer is reverse.

40Electrical EngineeringMedium

In a FET, there are ________pn junctions at the sides?

Athree

Bfour

Ctwo

Dfive

Correct answer

C. two

Explanation

The correct answer is two.

31Electrical EngineeringMedium

When drain voltage equals the pinch-off-voltage, then drain current ________ with the increase in drain voltage?

Aincreases

Bremains constant

Cnone of the above

Ddecreases

Correct answer

B. remains constant

Explanation

The correct answer is remains constant.

32Electrical EngineeringMedium

The channel of a JFET is between the ________?

Ainput and output

Bdrain and source

Cgate and drain

Dgate and source

Correct answer

B. drain and source

Explanation

The correct answer is drain and source.

33Electrical EngineeringMedium

A n-channel D-MOSFET with a positive VGS is operating in ________?

Athe enhancement-mode

Bsaturation

Ccut off

Dthe depletion-mode

Correct answer

A. the enhancement-mode

Explanation

The correct answer is the enhancement-mode.

34Electrical EngineeringMedium

A JFET has ________ power gain?

Avery high

Bnone of the above

Csmall

Dvery small

Correct answer

A. very high

Explanation

The correct answer is very high.

35Electrical EngineeringMedium

If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ________?

Anone of the above

Bis decreased

Cis increased

Dremains the same

Correct answer

B. is decreased

Explanation

The correct answer is is decreased.

36Electrical EngineeringMedium

The output characteristics of a JFET closely resemble the output characteristics of a ________ valve?

Atriode

Bpentode

Ctetrode

Ddiode

Correct answer

B. pentode

Explanation

The correct answer is pentode.

37Electrical EngineeringMedium

If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ________?

Ais decreased

Bnone of the above

Cis increased

Dremains the same

Correct answer

C. is increased

Explanation

The correct answer is is increased.

38Electrical EngineeringMedium

A MOSFET can be operated with________?

Apositive gate voltage only

Bnone of the above

Cpositive as well as negative gate voltage

Dnegative gate voltage only

Correct answer

C. positive as well as negative gate voltage

Explanation

The correct answer is positive as well as negative gate voltage.

39Electrical EngineeringMedium

The gate of a JFET is ________ biased?

Anone of the above

Bforward

Creverse as well as forward

Dreverse

Correct answer

D. reverse

Explanation

The correct answer is reverse.

40Electrical EngineeringMedium

In a FET, there are ________pn junctions at the sides?

Athree

Bfour

Ctwo

Dfive

Correct answer

C. two

Explanation

The correct answer is two.