electrical engineering MCQs – Page 23

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 Review each marked answer and report any item that may be outdated or unclear.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
441. Binaryvapour cycles are used to_____________?
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A. increase the efficiency of the plant

B. increase the performance of the condenser

C. increase efficiency of the turbine

442. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?
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A. 33.3 percent of copper

B. 66.7 percent of copper

C. 125 percent of copper

D. 31.25 percent of copper
443. The power transmitted will be maximum when____________?
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A. corona losses are minimum

B. reactance is high

C. sending end voltage is more

D. receiving end voltage is more

444. A steam power station requires space______________?
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A. more than diesel power station

B. less than diesel power station

C. equal to diesel power station

445. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?
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A. same as long as initial pressure and temperature is unchanged

B. higher

C. lower

D. none of the above

446. Primary air is that air which is used to_____________?
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A. reduce the flame length

B. increase the flame length

C. transport and dry the coal

D. provide air around burners for getting optimum combustion

447. In transmission lines the cross-arms are made of________________?
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A. R.C.C.

B. copper

C. steel

D. wood

448. Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?
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A. Synchronous condenser

B. Booster transformer

C. Static condenser

D. Tap changing transformer

449. The effect of considering friction in steam nozzles for the same pressure ratio leads to_________?
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A. decrease or increase of dryness fraction of exit steam depending upon inlet quality

B. decrease in dryness fraction of exit steam

C. no change in the quality of exit steam

D. increase in dryness fraction of exit steam
450. Losses which occur in rotating electric machines and do not occur in transformers are___________?
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A. friction and windage losses

B. copper losses

C. magnetic losses

D. hysteresis and eddy current losses

451. The operating voltage of supertension cables is up to_________________?
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A. 3.3 kV

B. 11 kV

C. 33 kV

D. 6.6 kV

452. Economisers improve boiler efficiency by__________?
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A. 4 to 10%

B. 10 to 12%

C. 1 to 5%

453. The value of the reheat factor is of the order of_____________?
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A. above 1.5

B. 1.1 to 1.5

C. 1.0 to 1.05

D. 0.8 to 1.0

454. The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
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A. protects the primary circuit

B. avoids core saturation and high voltage induction

C. is safe to human beings

D. none of the above

455. Mercury is a choice with steam in binary vapour cycle because it has____________?
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A. higher saturation temperature than other fluids

B. all above

C. higher critical temperature and pressure

D. relatively low vapourisation pressure

456. The maximum length of a screw conveyer is about___________?
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A. 100 metres

B. 60 metres

C. 30 metres

D. 40 metres

457. Pin type insulators are generally not used for voltages beyond_________?
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A. 1 kV

B. 33 kV

C. 22 kV

D. 11 kV

458. In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?
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A. central

B. none of the above

C. unit

459. Minimum voltage regulation occurs when the power factor of the load is_____________?
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A. leading

B. unity

C. lagging

D. zero

460. A booster is a_________________?
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A. none of the above

B. series wound generator

C. shunt wound generator

D. synchronous generator