electrical engineering MCQs – Page 353

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 Review each marked answer and report any item that may be outdated or unclear.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

7041. The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ?
0

A. Corrugations

B. Fins

C. All of the above

D. Tubes

E. Radiator tanks

7042. Which of the following methods is used for air cooling of turbo-alternators ?
0

A. All of the above

B. One sided axial ventilation

C. Two sided axial ventilation

D. Multiple inlet system

7043. Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
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A. Increased I R losses

B. Increased core losses

C. Poor commutation

D. All of the above

E. Change in motor parameters

7044. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?
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A. convection

B. conduction

C. radiation

D. any of the above

7045. In D.C. machines the number of slots per pole usually lies___________?
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A. between 2 to 4

B. between 9 to 16

C. between 6 to 8

D. between 20 to 30

7046. With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?
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A. 200 MW

B. 50 MW

C. 100 MW

D. none of the above

7047. Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?
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A. Equivalent power method

B. Method of average losses

C. Equivalent torque method

D. Equivalent current method

7048. Helical windings are used in________________?
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A. shell type transformers

B. none of the above

C. power transformers

D. distribution transformers

7049. The high voltage winding is usually which of the following type ?
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A. Continuous disc type winding with rectangular conductors

B. Cross-over winding with either circular or small rectangular conductors

C. Cylindrical winding with circular conductors

D. All of the above types

7050. The weight of copper of both armature and field windings decreases with __________ in number of poles?
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A. none of the above

B. decrease

C. either of the above

D. increase

7051. The winding where dummy coils are used is sometimes called______________?
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A. triplex winding

B. none of the above

C. duplex winding

D. forced winding

7052. The time taken by the machine to attain 0.632 of its final steady temperature rise is called_____________?
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A. cooling time constant

B. heating time constant

C. none of the above

D. either A. or B.

7053. The cold rolled grain oriented steel has _________ permeability in the direction of the grain orientation?
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A. maximum

B. minimum

C. none of the above

D. nil

7054. Which of the following is the commonly used type of electromagnets ?
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A. All of the above

B. Horse shoe type

C. Flat-faced armature type

D. Flat-faced plunger type

7055. The operation of a D.C. machine with large air gap lengths is comparatively_____________?
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A. quiet

B. either of the above

C. noisy

D. none of the above

7056. The stator of a D.C. machine comprises of_____________?
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A. interpoles

B. frame

C. main poles

D. all of the above

7057. is usually used for brush rockers____________?
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A. Aluminium

B. Cast-iron

C. Mild steel

D. Copper

7058. By which of the following methods motor rating for variable load drives can be determined ?
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A. Equivalent power method

B. Equivalent torque method

C. Equivalent current method

D. Method of average losses

E. All of the above

7059. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
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A. either of the above

B. decrease

C. increase

D. none of the above

7060. Which of the following is the basic consideration in the design of insulation ?
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A. Electrical considerations

B. Thermal considerations

C. All of the above

D. Mechanical considerations

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