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transistor biasing MCQs

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

transistor biasing Mcqs
1. The stabilisation of operating point in potential divider method is provided by_______________?
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A. RC consideration

B. RE consideration

C. None of the above

D. VCC consideration

2. A silicon transistor is biased with base resistor method. If =100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ?
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A. 530 kO

B. None of the above

C. 315 kO

D. 105 kO

3. If biasing is not done in an amplifier circuit, it results in________________?
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A. Unfaithful amplification

B. None of the above

C. Decrease in the base current

D. Excessive collector bias

4. For faithful amplification by a transistor circuit, the value of VCE should______________for silicon transistor?
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A. Be zero

B. Not fall below 1 V

C. None of the above

D. Be 0.2 V

5. The value of VBE ___________________?
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A. None of the above

B. Is almost independent of IC

C. Is strongly dependant on IC

D. Depends upon IC to moderate extent

6. For good stabilsation in voltage divider bias, the current I1 flowing through R1 and R2 should be equal to or greater than_____________?
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A. 10 IB

B. 3 IB

C. 4 IB

D. 2 IB

7. The value of stability factor for a base resistor bias is________________?
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A. (+1)

B. (+1)RC

C. RB (+1)

D. 1-

8. In a base resistor method, if the value of changes by 50, then collector current will change by a factor ___________________?
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A. 100

B. 50

C. 200

D. 25

9. The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor?
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A. One hundredth

B. One tenth

C. One thousandth

D. One millionth

10. For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line?
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A. The maximum current point

B. None of the above

C. Middle

D. The end point

11. Operating point represents__________________?
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A. Zero signal values of IC and VCE

B. The magnitude of signal

C. Values of IC and VCE when signal is applied

D. None of the above

12. In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kO, what is the value of RE ?
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A. 800 O

B. 1400 O

C. 1600 O

D. 2000 O

13. The stability factor of a collector feedback bias circuit is_______________ that of base resistor bias?
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A. More than

B. None of the above

C. Less than

D. The same as

14. Transistor biasing represents ______________ conditions?
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A. a.c

B. d.c

C. both a.c. and d.c

D. none of the above

15. The disadvantage of base resistor method of transistor biasing is that it_________________?
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A. None of the above

B. Is sensitive to changes in

C. Is complicated

D. Provides high stability

16. Thermal runaway occurs when_________________?
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A. Junction capacitance is high

B. Collector is reverse biased

C. Transistor is not biased

D. Emitter is forward biased

17. If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?
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A. 6 mA

B. 3 mA

C. mA

D. 1 mA

18. In a transistor amplifier circuit VCE = VCB +________________?
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A. 5 VBE

B. 2VBE

C. None of the above

D. VBE
19. In the design of a biasing circuit, the value of collector load RC is determined by__________________?
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A. VBE consideration

B. VCE consideration

C. None of the above

D. IB consideration

20. An ideal value of stability factor is________________?
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A. 1

B. More than 200

C. 200

D. 100

21. The point of intersection of d.c. and a.c. load lines represents __________________?
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A. Operating point

B. None of the above

C. Voltage gain

D. Current gain

22. When the temperature changes, the operating point is shifted due to _______________?
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A. Change in the values of circuit resistance

B. Change in ICBO

C. Change in VCC

D. None of the above

23. The operating point is also called the _______________?
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A. Cut off point

B. Saturation point

C. None of the above

D. Quiescent point
24. The disadvantage of voltage divider bias is that it has _________________?
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A. Low base current

B. None of the above

C. Many resistors

D. High stability factor

25. For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?
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A. Be zero

B. Not fall below 0.7 V

C. Be between 0 V and 0.1 V

D. Be 0.01 V

26. If the temperature increases, the value of VCE_________________?
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A. Is decreased

B. Remains the same

C. Is increased

D. None of the above

27. The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier?
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A. More than 10

B. 1

C. 3

D. 4

28. The circuit that provides the best stabilization of operating point is___________________?
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A. Potential divider bias

B. Base resistor bias

C. None of the above

D. Collector feedback bias

29. Transistor biasing is generally provided by a_______________?
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A. Biasing circuit

B. Bias battery

C. Diode

D. None of the above

30. For proper operation of the transistor, its collector should have___________________?
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A. Proper forward bias

B. Very small size

C. Proper reverse bias

D. None of the above

31. In a particular biasing circuit, the value of RE is about _________________?
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A. 10 kO

B. 800 O

C. 1 MO

D. 100 kO

32. In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?
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A. V

B. 8 V

C. 7 V

D. 3 V

33. The purpose of resistance in the emitter circuit of a transistor amplifier is to _________________?
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A. Provide base-emitter bias

B. None of the above

C. Limit the maximum emitter current

D. Limit the change in emitter current
34. The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 A, then IC will change by___________________?
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A. 20 A

B. 50 A

C. 25 A

D. 100 A

35. Transistor biasing is done to keep _____________in the circuit?
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A. Proper alternating current

B. Collector current small

C. The base current small

D. Proper direct current
36. The base resistor method is generally used in ________________?
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A. Rectifier circuits

B. Amplifier circuits

C. None of the above

D. Switching circuits
37. For germanium transistor amplifier, VCE should_______________for faithful amplification?
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A. None of the above

B. Be zero

C. Be 0.2 V

D. Not fall below 0.7 V
38. The operating point ________________ on the a.c. load line?
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A. Also line

B. May or may not lie

C. Data insufficient

D. Does not lie

39. In the above question (Q38.) , what is the collector voltage ?
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A. 6 V

B. 8 V

C. 3 V

D. 7 V

40. If the value of collector current IC increases, then the value of VCE ______________?
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A. Remains the same

B. None of the above

C. Increases

D. Decreases