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single stage transistor amplifiers MCQs

Practise focused single stage transistor amplifiers questions with marked answers for exam preparation and subject revision.

single stage transistor amplifiers Mcqs
1. The purpose of capacitors in a transistor amplifier is to___________________?
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A. Couple or bypass a.c. component

B. Provide biasing

C. Protect the transistor

D. Cool the transistor

2. In the zero signal conditions, a transistor sees _____________ load?
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A. c.

B. c.

C. both d.c. and a.c.

D. none of the above

3. The purpose of d.c. conditions in a transistor is to___________________?
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A. None of the above

B. Set up operating point

C. Reverse bias the emitter

D. Forward bias the collector

4. The purpose of a coupling capacitor in a transistor amplifier is to ___________________?
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A. Protect the transistor

B. Increase the output impedance of transistor

C. Provide biasing

D. Pass a.c. and block d.c.
5. In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________?
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A. Open

B. Partially open

C. None of the above

D. Short
6. If the collector supply is 10V, then collector cut off voltage under d.c. conditions is _______________?
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A. 2 V

B. 10 V

C. 20 V

D. 5 V

7. A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?
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A. RC RE

B. RC || RE

C. RC + RE

D. RC

8. The input capacitor in an amplifier is the______________ capacitor?
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A. Leakage

B. Coupling

C. Bypass

D. None of the above

9. If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?
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A. 5 k?

B. 10 k?

C. 20 k?

D. 2 k?

10. The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
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A. Biasing circuit

B. None of the above

C. Transistor

D. Collector supply VCC
11. The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?
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A. None of the above

B. Less than

C. More than

D. The same as

12. The phase difference between the output and input voltages of a CE amplifier is _____________?
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A. 180o

B. 0o

C. 90o

D. 270o

13. In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?
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A. 270o

B. 180o

C. 90o

D. 0o
14. If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?
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A. RC

B. RL + RC

C. RC || RL

D. RL RC

15. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?
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A. RL

B. RC || RL

C. RC

D. RC + RL

16. It is generally desired that a transistor should have_____________________ input impedance?
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A. Very low

B. High

C. Very high

D. Low

17. A transistor converts __________________?
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A. c. power into a.c. power

B. c. power into d.c. power

C. high resistance into low resistance

D. none of the above

18. CC configuration is used for impedance matching because its ________________?
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A. None of the above

B. Input impedance is very high

C. Input impedance is low

D. Output impedance is very low

19. The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?
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A. None of the above

B. Less than

C. The same as

D. More than

20. The ratio of output impedance of a CE amplifier is _______________?
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A. High

B. Low

C. About 1

D. Moderate
21. In transistor amplifiers, we generally use______________ capacitors?
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A. Electrolytic

B. Mica

C. Paper

D. Air

22. A transistor amplifier has high output impedance because ______________?
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A. Emitter is heavily doped

B. Collector has reverse bias

C. None of the above

D. Collector is wider than emitter or base

23. If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?
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A. 165 x 104

B. 100

C. 165

D. None of the above

24. When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________?
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A. c. load line

B. c. load line

C. both d.c. and a.c. load lines

D. none of the above

25. An amplifier has a power gain of 100. Its db gain is ________________?
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A. 10 db

B. 20 db

C. None of the above

D. 40 db

26. In a CE amplifier, voltage gain =____________________ x RAC/Rin?
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A. (1 + ?)

B. (1+ ?)

C. ?

D. ?

27. The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?
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A. Avoid voltage gain drop

B. Reduce noise in the amplifier

C. Forward bias the emitter

D. None of the above

28. The point of intersection of d.c. and a.c. load lines is called________________?
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A. Operating point

B. Saturation point

C. Cut off point

D. None of the above

29. For highest power gain, one would use _________________configuration?
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A. CC

B. CE

C. CB

D. none of the above

30. The slope of a.c. load line is ______________ that of d.c. load line?
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A. The same as

B. Less than

C. More than

D. None of the above

31. The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?
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A. A million

B. 10000

C. 100

D. 1000

32. A CE amplifier is also called _______________ circuit?
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A. None of the above

B. Grounded collector

C. Grounded base

D. Grounded emitter
33. In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________?
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A. None of the above

B. Short

C. Open

D. Partially short

34. When a transistor amplifier is operating, the current in any branch is _______________?
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A. c. only

B. Sum of a.c. and d.c.

C. difference of a.c. and d.c.

D. c. only

35. In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?
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A. Wide emitter

B. Thin collector

C. Thin base

D. None of the above

36. A single stage transistor amplifier contains______________ and associated circuitry?
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A. Three transistor

B. Two transistors

C. One transistor

D. None of the above

37. If the input capacitor of a transistor amplifier is short-circuited, then_________________?
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A. Biasing conditions will change

B. Transistor will be destroyed

C. Signal will not reach the base

D. None of the above

38. If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?
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A. Low

B. High

C. Very high

D. Moderate