electrical engineering MCQs – Page 318

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 Review each marked answer and report any item that may be outdated or unclear.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

6341. Carnot cycle comprises of_______?
0

A. two isothermal processes and three constant pressure processes

B. none of the above

C. two isentropic processes and two constant pressure processes

D. two isentropic processes and two constant volume processes

6342. Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
0

A. anthracite

B. lignite

C. semibituminous and bituminous

6343. The capacity of large turbo-generators varies from___________?
0

A. 20 to 100 MW

B. 50 to 300 MW

C. 70 to 400 MW

D. 100 to 650 MW

6344. The draught produced by chimney of given height at given outside temperature___________?
0

A. decreases if the chimney gas temperature increases

B. increases if the chimney gas temperature increases

C. remains same irrespective of chimney gas temperature

D. may increase or decrease

6345. In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________?
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A. is unaffected by increase in Rankine cycle efficiency

B. decreases with increase in Rankine cycle efficiency

C. none of the above

D. increases with increase in Rankine cycle efficiency

6346. Deaerative heating is done to_____________?
0

A. remove dissolved gases in the water

B. heat the air in the water

C. heat the water

D. erative heating is done to

6347. In regenerative cycle feed water is heated by_____________?
0

A. exhaust gases

B. heaters

C. draining steam from the turbine

D. all above

6348. The main source of production of biogas is__________________?
0

A. all above

B. human waste

C. wet cow dung

D. wet livestock waste

6349. The artificial draught normally is designed to produce____________?
0

A. less smoke

B. all of the above

C. more draught

D. less chimney gas temperature

6350. Method which is commonly applied for unloading the coal for small power plant is___________?
0

A. lift trucks

B. belt conveyor

C. coal accelerators

D. tower cranes

6351. For forced draught system, the function of chimney is mainly_____________?
0

A. to produce draught to accelerate the combustion of fuel

B. to reduce the temperature of the hot gases discharged

C. none of the above

D. to discharge gases high up in the atmosphere to avoid hazard

6352. In a regenerative surface condenser_____________?
0

A. there are three pumps to remove air, vapour and condensate

B. there are two pumps to remove air and condensate

C. there is no pump, the condensate gets removed by gravity

D. there is one pump to remove air and condensate

6353. Load center in a power station is___________?
0

A. center of coal fields

B. center of gravity of electrical system

C. center of maximum load of equipments

6354. For the same draught produced the power of induced draught fan as compared to forced draught fan is___________?
0

A. not predictable

B. less

C. same

D. more

6355. Reheat factor in steam turbines depends on______________?
0

A. initial pressures and temperature only

B. stage efficiency only

C. exit pressure only

D. all of the above

6356. Curtis turbine is_____________?
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A. velocity compounded impulse steam turbine

B. pressure compounded impulse steam turbine

C. reaction steam turbine

D. pressure velocity compounded steam turbine

6357. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?
0

A. none of the above

B. increases with number of feed heaters increasing

C. remains same unaffected by number of feed heaters

D. decreases with number of feed heaters increasing

6358. The pressure on the two sides of the impulse wheel of a steam turbine_____?
0

A. increases from one side to the other side

B. is different

C. is same

D. decreases from one side to the other side

6359. Incase of reaction steam turbine___________?
0

A. there is enthalpy drop both in fixed and moving blades

B. there is enthalpy drop only in fixed blades

C. there is enthalpy drop only in moving blades

D. none of the above

6360. The draught produced by steel chimney as compared to that produced by brick chimney for the same height is_____________?
0

A. same

B. less

C. more

D. may be more or less

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