electrical engineering MCQs – Page 350

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 Review each marked answer and report any item that may be outdated or unclear.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
6981. In a transistor ______________?
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A. IE = IC + IB

B. IB = IC + IE

C. IC = IE + IB

D. IE = IC IB

6982. IC = aIE +____________?
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A. IB

B. ICBO

C. ICEO

D. IB

6983. The most commonly used transistor arrangement is____________arrangement?
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A. none of the above

B. common emitter

C. common collector

D. common base

6984. The relation between and a is______________?
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A. = (1 a ) / a

B. = a / (1 a )

C. = a / (1 + a )

D. = 1 / (1 a )

6985. Most of the majority carriers from the emitter____________?
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A. recombine in the base

B. none of the above

C. recombine in the emitter

D. pass through the base region to the collector
6986. The base of a transistor is____________doped?
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A. heavily

B. moderately

C. lightly

D. none of the above

6987. A transistor has____________?
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A. two pn junctions

B. four pn junctions

C. one pn junction

D. three pn junctions

6988. A transistor is a___________operated device?
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A. current

B. voltage

C. both voltage and current

D. none of the above

6989. BC 147 transistor indicates that it is made of____________?
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A. carbon

B. silicon

C. none of the above

D. germanium

6990. The value of for a transistor is generally____________?
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A. 1

B. above 500

C. between 20 and 500

D. less than 1

6991. IC = IB +__________?
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A. ICBO

B. ICEO

C. IC

D. aIE

6992. The most commonly used semiconductor in the manufacture of a transistor is_____________?
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A. germanium

B. silicon

C. none of the above

D. carbon

6993. At the base-emitter junctions of a transistor, one finds___________?
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A. a wide depletion layer

B. low resistance

C. none of the above

D. a reverse bias

6994. A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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A. 1.5 to 2.5 A/mm2

B. 4.0 to 5.0 A/mm2

C. 5.4 to 6.2 A/mm2

D. 3.5 to 4.5 A/mm2

6995. In D.C. machines the width of the duct is usually_____________?
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A. 6 mm

B. 4 mm

C. 8 mm

D. 10 mm
6996. ____________are always double layer type?
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A. Open windings

B. Closed windings

C. Either of the above

D. None of the above

6997. If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?
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A. unaffected

B. drastically increased

C. none of the above

D. drastically reduced
6998. In a D.C. machine the number of brush arms is _________ the number of poles?
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A. less than

B. none of the above

C. equal to

D. greater than

6999. The design of electromagnets is based upon which of the following fundamental equations ?
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A. Force equation

B. Voltage equation

C. All of the above

D. Magnetic circuit equation

E. Heating equation

7000. D.C. machines designed with a large value of air gap length have_____________?
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A. worst, ventilation

B. none of the above

C. poor ventilation

D. better ventilation