electrical engineering MCQs – Page 29

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 Review each marked answer and report any item that may be outdated or unclear.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

561. For given applied voltage, with the increase in frequency of the applied voltage?
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A. none of the above

B. eddy current loss will decrease

C. eddy current loss will increase

D. eddy current loss will remain unchanged

562. The secondary winding of which of the following transformers is always kept closed?
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A. Current transformer

B. Step-down transformer

C. Potential transformer

D. Step-up transformer

563. In steam turbines the reheat factor_____________?
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A. decreases with the increase in number of stages

B. remains same irrespective of number of stages

C. increases with the increase in number of stages

D. none of the above

564. N atural air coo ling is generally restricted for transformers up to__________?
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A. 5 MVA

B. 1.5 MVA

C. 15 MVA

D. 50 MVA

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

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

C. steam and cooling water mix to give the condensate

D. all of the above varying with situation

566. Incase of reaction steam turbine___________?
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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

567. Which of the following is usually not the generating voltage ?
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A. 13.2 kV

B. 8.8 kV

C. 6.6 kV

D. 11 kV

568. TravelUng grate stoker can burn coals at the rates of____________?
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A. 75100 kg/m per hour

B. 5075 kg/m per hour

C. 100150 kg/m per hour

D. 150200 kg/m2 per hour

569. On which of the following factors skin effect depends?
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A. Size of the conductor

B. Resistivity of the conductor material

C. All of the above

D. Frequency of the current

570. The spacing between phase conductors of a 220 kV line is approximately equal to________________?
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A. 8.5 m

B. 6 m

C. 3.5 m

D. 2 m

571. The voltage of the single phase supply to residential consumers is_____________?
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A. 110 V

B. 210 V

C. 400 V

D. 230 V

572. The overall efficiency of thermal power plant is equal to____________?
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A. Rankine cycle efficiency

B. Boiler efficiency x turbine efficiency x generator efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency

573. Annual operating expenditure of a power plant consists of_________?
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A. fixed charges

B. semi-fixed charges

C. running charges

D. all of the above

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

B. 79%

C. 18%

D. 23%

575. In a boiler installation the natural draught is produced_____________?
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A. due to the fact that at the chimney top the pressure is more than its environmental pressure

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

C. all of the above

D. 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

576. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
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A. Current will flow to earth

B. None of the above

C. Supply voltage will drop

D. No current will flow in the conductor

E. Supply voltage will increase

577. In a steam power plant, the function of a condenser is__________?
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A. to receive large volumes of steam exhausted from steam prime mover

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

C. all of the above

D. to condense large volumes of steam to water which may be used again in boiler

578. A transformer can have regulation closer to zero___________?
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A. on full-load

B. on overload

C. on zero power factor

D. on leading power factor

579. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
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A. 150 kgf/cm2

B. 50 kgf/cm2

C. 100 kgf/cm2

D. 20 kgf/cm2

580. The angular displacement between two interconnected stations is mainly due to___________?
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A. armature reactance of both alternators

B. reactance of the interconnector

C. synchronous reactance of both the alternators

D. all of the above

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