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transistors MCQs

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

transistors Mcqs
1. In a npn transistor,_____________are the minority carriers?
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A. acceptor ions

B. holes

C. free electrons

D. donor ions

2. The element that has the biggest size in a transistor is____________?
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A. emitter

B. base

C. collector

D. collector-base-junction

3. The voltage gain of a transistor connected in common collector arrangement is____________?
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A. more than 100

B. less than 1

C. equal to 1

D. more than 10

4. As the temperature of a transistor goes up, the base-emitter resistance___________?
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A. remains the same

B. increases

C. decreases

D. none of the above

5. The collector-base junction in a transistor has___________?
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A. forward bias at all times

B. none of the above

C. reverse bias at all times

D. low resistance

6. The phase difference between the input and output voltages of a transistor connected in common collector arrangement is_____________?
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A. 00

B. 1800

C. 900

D. 2700

7. The input impedance of a transistor connected in___________arrangement is the highest?
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A. common emitter

B. common base

C. common collector

D. none of the above

8. The emitter of a transistor is___________doped?
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A. moderately

B. heavily

C. none of the above

D. lightly

9. In a pnp transistor, the current carriers are______________?
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A. holes

B. free electrons

C. acceptor ions

D. donor ions

10. In a tansistor, IC = 100 mA and IE = 100.2 mA. The value of is____________?
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A. 50

B. 200

C. 100

D. about 1

11. IC = [a / (1 a )] IB +_____________?
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A. ICEO

B. (1 a ) IB

C. ICBO

D. IC

12. The collector of a transistor is____________doped?
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A. heavily

B. lightly

C. moderately

D. none of the above

13. In a transistor, signal is transferred from a___________circuit?
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A. high resistance to low resistance

B. low resistance to high resistance

C. high resistance to high resistance

D. low resistance to low resistance

14. The leakage current in CE arrangement is____________that in CB arrangement?
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A. less than

B. none of the above

C. the same as

D. more than
15. A heat sink is generally used with a transistor to______________?
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A. compensate for excessive doping

B. decrease the forward current

C. prevent excessive temperature rise

D. increase the forward current

16. The output impedance of a transistor is____________?
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A. low

B. high

C. zero

D. very low

17. The power gain in a transistor connected in___________arrangement is the highest?
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A. common collector

B. common base

C. common emitter

D. none of the above

18. The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is___________?
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A. 180o

B. 0o

C. 90o

D. 270o

19. The voltage gain in a transistor connected in___________arrangement is the highest?
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A. common base

B. common emitter

C. common collector

D. none of the above

20. A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will____________?
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A. remain the same

B. decrease

C. none of the above

D. increase