electrical engineering MCQs – Page 204

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4061. The output stage of a multistage amplifier is also called _________________-?
0

A. Mixer stage

B. Power stage

C. Detector stage

D. F stage

4062. Class _____________ operation gives the maximum distortion?
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A. A

B. AB

C. B

D. C

4063. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ______________ operation?
0

A. Class B

B. None of the above

C. Class C

D. Class A

4064. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?
0

A. 40 W

B. 20 W

C. 10 W

D. 80 W

4065. The output transformer used in a power amplifier is a _____________ transformer?
0

A. 1:1 ratio

B. None of the above

C. Step-down

D. Step-up

4066. The disadvantage of impedance matching is that it _______________?
0

A. Gives distorted output

B. None of the above

C. Requires a transformer

D. Gives low power output

4067. The push-pull circuit must use ______________ operation?
0

A. Class B

B. Class A

C. Class C

D. Class AB

4068. In class A operation, the operating point is generally located_____________of the d.c. load line?
0

A. None of the above

B. At cut off point

C. At the middle

D. At saturation point

4069. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
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A. 10 W

B. 8 W

C. 4 W

D. None of the above

4070. A 2-transistor class B power amplifier is commonly called ______________ amplifier?
0

A. Push-pull

B. Differential

C. Symmetrical

D. Dual

4071. The most important consideration in power amplifier is __________________?
0

A. To keep the transformer cool

B. None of the above

C. Collector efficiency

D. Biasing the circuit

4072. The maximum efficiency of resistance loaded class A power amplifier is _________________?
0

A. 50%

B. 30%

C. 5%

D. 25%

4073. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?
0

A. 5 W

B. 33 W

C. 1 W

D. 75 W

4074. The output stage of a multistage amplifier usually employs _________________?
0

A. Class A power amplifier

B. Preamplifier

C. None of the above

D. Push-pull amplifier

4075. The output stage of a multistage amplifier usually employs______________?
0

A. Push-pull amplifier

B. None of the above

C. Preamplifier

D. Class A power amplifier

4076. A class A power amplifier is sometimes called______________amplifier?
0

A. Symmetrical

B. Single-ended

C. Differential

D. Reciprocating

4077. The maximum collector efficiency of class B operation is ________________?
0

A. 5%

B. 5%

C. 50%

D. 90%

4078. An AF amplifier is shielded to ________________?
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A. Keep the amplifier cool

B. Prevent induction due to stray magnetic fields

C. Protect from rusting

D. None of the above

4079. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
0

A. 5 W

B. 10 W

C. 20 W

D. 15 W

4080. The maximum efficiency of transformer coupled class A power amplifier is _______________?
0

A. 80%

B. 50%

C. 45%

D. 30%

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