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field effect transistors fet MCQs

Practise focused field effect transistors fet questions with marked answers for exam preparation and subject revision.

field effect transistors fet Mcqs

1. In a JFET, IDSS is known as ________________?
0

A. none of the above

B. drain to source current

C. drain to source current with gate shorted

D. drain to source current with gate open

2. A JFET has high input impedance because _________________?
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A. of impurity atoms

B. none of the above

C. it is made of semiconductor material

D. input is reverse biased

3. The constant-current region of a JFET lies between______________?
0

A. pinch-off and breakdown

B. cut off and saturation

C. cut off and pinch-off

D. and IDSS

4. A JFET is similar in operation to ___________ valve?
0

A. triode

B. tetrode

C. pentode

D. diode

5. The gate of a JFET is ___________ biased?
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A. forward

B. reverse

C. none of the above

D. reverse as well as forward

6. A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is _____________?
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A. 20 mA

B. 0 mA

C. 40 mA

D. 10 mA

7. In a certain CS JFET amplifier, RD= 1kO , RS= 560 O , VDD=10V and gm= 4500 S. If the source resistor is completely bypassed, the voltage gain is ________________?
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A. 2.52

B. 45

C. 450

D. 4.5

8. A certain JFET data sheet gives VGS(off) = -4 V. The pinch-off voltage Vp is _____________?
0

A. -4 V

B. data insufficient

C. +4 V

D. dependent on VGS

9. When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage?
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A. decreases

B. increases

C. none of the above

D. remains constant

10. The two important advantages of a JFET are _________________?
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A. inexpensive and high output impedance

B. none of the above

C. low input impedance and high output impedance

D. high input impedance and square-law property

11. In a p-channel JFET, the charge carriers are _____________?
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A. electrons

B. holes

C. both electrons and holes

D. none of the above

12. _____________ has the lowest noise-level?
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A. triode

B. tetrode

C. JFET

D. ordinary trnsistor

13. A MOSFET is sometimes called______________ JFET?
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A. open gate

B. many gate

C. insulated gate

D. shorted gate

14. The pinch-off voltage of a JFET is about _______________?
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A. 25 V

B. 0.6 V

C. 5 V

D. 15 V

15. A JFET is a__________ driven device?
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A. current

B. voltage

C. both current and voltage

D. none of the above

16. A n-channel D-MOSFET with a positive VGS is operating in _______________?
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A. the enhancement-mode

B. cut off

C. saturation

D. the depletion-mode

17. A MOSFET can be operated with________________?
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A. negative gate voltage only

B. positive gate voltage only

C. none of the above

D. positive as well as negative gate voltage

18. A JFET is also called____________ transistor?
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A. bipolar

B. unipolar

C. unijunction

D. none of the above

19. A JFET has three terminals, namely________________?
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A. emitter, base, collector

B. none of the above

C. cathode, anode, grid

D. source, gate, drain

20. A MOSFET uses the electric field of a _______________to control the channel current?
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A. battery

B. none of the above

C. generator

D. capacitor

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