electrical engineering MCQs – Page 319

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 Review each marked answer and report any item that may be outdated or unclear.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
6361. Belt conveyer can be used to transport coal at inclinations upto____________?
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A. 60

B. 90

C. 80

D. 30
6362. Secondary air is the air used to______________?
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A. increase the flame length

B. reduce the flame length

C. provide air round the burners for getting optimum combustion

D. transport and dry the coal

6363. The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?
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A. 25 to 30%

B. 40 to 50%

C. 85 to 90%

D. 65 to 70%

6364. In jet type condensers___________?
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A. steam and cooling water do not mix

B. cooling water passes through tubes and steam surrounds them

C. steam passes through tubes and cooling water surrounds them

D. steam and cooling water mix
6365. For Parsons reaction steam turbine, degree of reaction is____________?
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A. 60%

B. 50%

C. 75%

D. 100%

6366. In a shell and tube surface condenser____________?
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A. cooling water passes through the tubes and steam surrounds them

B. all of the above varying with situation

C. steam and cooling water mix to give the condensate

D. steam passes through the cooling tubes and cooling water surrounds them

6367. In a regenerative feed heating cycle, the greatest economy is affected___________?
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A. when steam is extracted from only one suitable point of steam turbine

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

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

D. when steam is extracted from several places in different stages of steam turbine
6368. The maximum length of a screw conveyer is about___________?
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A. 100 metres

B. 30 metres

C. 60 metres

D. 40 metres

6369. The draught in locomotive boilers is produced by_____________?
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A. forced fan

B. only motion of locomotive

C. steam jet

D. chimney

6370. In a steam power plant, the function of a condenser is__________?
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A. to condense large volumes of steam to water which may be used again in boiler

B. to maintain pressure below atmospheric to increase work output from the primemover

C. to receive large volumes of steam exhausted from steam prime mover

D. all of the above
6371. Rateau steam turbine is______________?
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A. pressure compounded impulse steam turbine

B. velocity compounded impulse steam turbine

C. pressure velocity compounded steam turbine

D. reaction steam turbine

6372. The percentage O2 by Weight in atmospheric air is____________?
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A. 77%

B. 23%

C. 79%

D. 18%

6373. In fuel cell, the ___________ energy is converted into electrical energy?
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A. heat

B. mechanical

C. chemical

D. sound

6374. Pipes carrying steam are generally made up of_____________?
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A. aluminium

B. cast iron

C. steel

D. copper

6375. The energy radiated by sun on a bright sunny day is approximately______________?
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A. 700 W/m2

B. 800 W/m2

C. 1 kW/m2

D. 2 kW/m2

6376. Economisers improve boiler efficiency by__________?
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A. 10 to 12%

B. 4 to 10%

C. 1 to 5%

6377. In a surface condenser if air is removed, there is___________?
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A. rise in absolute pressure maintained in condenser

B. rise in temperature of condensed steam

C. no change in absolute pressure in the condenser

D. fall in absolute pressure maintained in condenser
6378. Bucket elevators are used for___________?
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A. carrying coal in horizontal direction

B. carrying coal in any direction

C. carrying coal in vertical direction
6379. Steam turbines are governed by the following methods_____________?
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A. all of the above

B. Nozzle control governing

C. By-pass governing

D. Throttle governing

6380. The critical pressure ratio of a convergent nozzle is defined as_____________?
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A. the ratio of outlet pressure to inlet pressure only when mass flow rate = c

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 per unit area is minimum

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