electrical engineering MCQs – Page 279

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
5561. 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

5562. 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

5563. 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

5564. 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

5565. The ratio of output impedance of a CE amplifier is _______________?
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A. High

B. Low

C. About 1

D. Moderate
5566. In transistor amplifiers, we generally use______________ capacitors?
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A. Electrolytic

B. Mica

C. Paper

D. Air

5567. 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

5568. 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

5569. 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

5570. 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

5571. In a CE amplifier, voltage gain =____________________ x RAC/Rin?
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A. (1 + ?)

B. (1+ ?)

C. ?

D. ?

5572. 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

5573. 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

5574. For highest power gain, one would use _________________configuration?
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A. CC

B. CE

C. CB

D. none of the above

5575. 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

5576. 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

5577. 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
5578. 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

5579. 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

5580. 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