electrical engineering MCQs – Page 320

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 Review each marked answer and report any item that may be outdated or unclear.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

6381. Steam turbines commonly used in steam power station are__________?
0

A. none of the above

B. non-condensing type

C. condensing type

6382. Artificial draught is produced by______________?
0

A. induced fan

B. induced and forced fan

C. all of the above

D. forced fan

6383. The overall efficiency of thermal power plant is equal to____________?
0

A. Boiler efficiency x turbine efficiency x generator efficiency

B. Rankine cycle efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency

6384. The modern steam turbines are___________?
0

A. impulse-reaction turbines

B. reaction turbines

C. none of the above

D. impulse turbines

6385. The commercial sources of energy are____________?
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A. solar, wind and biomass

B. none of the above

C. wood, animal wastes and agriculture wastes

D. fossil fuels, hydropower and nuclear energy

6386. In Rankine cycle the work output from the turbine is given by__________?
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A. change of enthaply between inlet and outlet

B. change of internal energy between inlet and outlet

C. change of entropy between inlet and outlet

D. change of temperature between inlet and outlet

6387. Binaryvapour cycles are used to_____________?
0

A. increase the performance of the condenser

B. increase the efficiency of the plant

C. increase efficiency of the turbine

6388. The efficiency of chimney is approximately______________?
0

A. 80%

B. 0.25%

C. 20%

D. 40%

6389. A steam power station requires space______________?
0

A. less than diesel power station

B. equal to diesel power station

C. more than diesel power station

6390. Blowing down of boiler water is the process_____________?
0

A. to reduce the boiler pressure

B. to increase the steam temperature

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

D. none of the above

6391. Reheat cycle in steam power plant is used to________________?
0

A. increase thermal efficiency

B. reduce loss of heat

C. utilise heat of flue gases

D. improve condenser performance

6392. TravelUng grate stoker can burn coals at the rates of____________?
0

A. 75100 kg/m per hour

B. 150200 kg/m2 per hour

C. 5075 kg/m per hour

D. 100150 kg/m per hour

6393. The draught produced, for a given height of the chimney and given mean temperature of chimney gases_______________?
0

A. increases with increase in outside air temperature

B. may increase or decrease with increase in outside air temperature

C. decreases with increase in outside air temperature

D. remains the same irrespective of outside air temperature

6394. Artificial draught is produced by____________?
0

A. all of the above

B. steam jet

C. air fans

D. fan or steam jet

6395. Reheat factor is the ratio of_____________?
0

A. adiabatic heat drop to isentropic heat drop

B. isentropic heat drop to useful heat drop

C. cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

6396. For the induced draught the fan is located_______________?
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A. anywhere permissible

B. at the top of the chimney

C. near bottom of furnace

D. near bottom of chimney

6397. Rankine cycle operating on low pressure limit of p1 an 1 high pressure limit of p2__________?
0

A. may be more or less depending upon the magnitude of p1 and p2

B. has higher the renal efficiency than the carnot cycle operating between same pressure limits

C. has same thermal efficiency as carnot cycle operating between same pressure limits

D. has lower thenal efficiency than carnot cycle operating between same pressure limit?

6398. Example of overfeed type stoker is___________?
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A. all of the above

B. spreader

C. travelling grate

D. chain grate

6399. In a boiler installation the natural draught is produced_____________?
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A. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column

B. all of the above

C. due to the fact that at the chimney top the pressure is more than its environmental pressure

D. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in

6400. In De Laval steam turbine___________?
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A. none from the above

B. the pressure in the turbine rotor is approximately same as in condenser

C. the pressure in the turbine rotor is higher than pressure in the condenser

D. the pressure in the turbine rotor gradually decreases from inlet to exit from condenser

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