electrical engineering MCQs – Page 27

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 Review each marked answer and report any item that may be outdated or unclear.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

521. In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________?
0

A. decreases with increase in Rankine cycle efficiency

B. is unaffected by increase in Rankine cycle efficiency

C. none of the above

D. increases with increase in Rankine cycle efficiency

522. The critical pressure ratio of a convergent nozzle is defined as_____________?
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A. the ratio of inlet pressure to outlet pressure of nozzle

B. the ratio of outlet pressure to inlet pressure of nozzle

C. the ratio of outlet pressure to inlet pressure only when mass flow rate = c

D. the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum

523. In a regenerative feed heating cycle, the greatest economy is affected___________?
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A. when steam is extracted from several places in different stages of steam turbine

B. when steam is extracted from only one suitable point of steam turbine

C. when steam is extracted only from the last stage of steam turbine

D. when steam is extracted only from the first stage of steam turbine

524. Part of the transformer which is most subject to damage from overheating is_____________?
0

A. copper winding

B. iron core

C. frame or case

D. winding insulation

E. transformer tank

525. Artificial draught is produced by______________?
0

A. induced and forced fan

B. all of the above

C. induced fan

D. forced fan

526. The cooling section in the surface condenser__________?
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A. reduces the quantity of vapour extracted along with air

B. none of the above

C. increases the quantity of vapour extracted along with air

D. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump

527. The operating voltage of high voltage cables is up to_______________?
0

A. 3.3kV

B. l.lkV

C. llkV

D. 6.6kV

528. The operating voltage of extra high tension cables is upto_______________?
0

A. 132 kV

B. 66 kV

C. 6.6 kV

D. 33 kV

E. 11 kV

529. Steam turbines commonly used in steam power station are__________?
0

A. non-condensing type

B. condensing type

C. none of the above

530. Series capacitors on transmission lines are of little use when the load VAR requirement is___________?
0

A. large

B. small

C. fluctuating

D. any of the above

531. The power factor of industrial loads is generally______________?
0

A. unity

B. leading

C. zero

D. lagging

532. Blowing down of boiler water is the process_____________?
0

A. none of the above

B. to control the solid concentration in the boiler water by removing some of the concentrated saline water

C. to increase the steam temperature

D. to reduce the boiler pressure

533. If a transformer is switched on to a voltage more than the rated voltage______________?
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A. its power factor will remain unaffected

B. its power factor will be zero

C. its power factor will increase

D. its power factor will deteriorate

534. The voltage drop, for constant voltage transmission is compensated by installing__________?
0

A. none of the above

B. all of above

C. capacitors

D. synchronous motors

E. inductors

535. The function of breather in a transformer is___________?
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A. to provide oxygen inside the tank

B. to arrest flow of moisture when outside air enters the transformer

C. to cool the transformer oil

D. to cool the coils during reduced load

536. Rankine efficiency of a steam power plant____________?
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A. improves in summer as compared to that in winter

B. improves in winter as compared to that in summer

C. is unaffected by climatic conditions

D. none of the above

537. Caking coals are those which__________?
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A. burn freely

B. do not form ash

C. burn completely

D. form lumps or masses of coke

538. The modern steam turbines are___________?
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A. none of the above

B. impulse turbines

C. impulse-reaction turbines

D. reaction turbines

539. The frequency of voltage generated, in case of generators, can be increased by___________?
0

A. using reactors

B. none of the above

C. increasing the load

D. adjusting the governor

E. reducing the terminal voltage

540. Which of the following application requires high starting torque ?
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A. Centrifugal pump

B. Locomotive

C. Air blower

D. Lathe machine

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