electrical engineering MCQs – Page 352

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 Review each marked answer and report any item that may be outdated or unclear.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

7021. Machines cooled by direct cooling method may be called_____________?
0

A. any of the above

B. supercharged

C. inner cooled

D. conductor cooled

7022. In a D.C. machine the current per brush arm should not be more than_____________?
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A. 300 A

B. 200 A

C. 400 A

D. 100 A

7023. The cold rolled grain oriented steel has ___________ permeability in the direction of the grain orientation?
0

A. nil

B. maximum

C. minimum

D. none of the above

7024. Electrical machines having a power output up to about 750 W may be called__________machines?
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A. any of the above

B. large size

C. medium size

D. small size

7025. The value of exciting or magnetizing current depends upon which of the following factors ?
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A. The number of turns in the exciting winding

B. All of the above

C. The way in which the winding is distributed

D. Total m.m.f. required

7026. Yokes with rectangular cross-section are used for_______________?
0

A. any of the above

B. large capacity transformers

C. medium capacity transformers

D. small capacity transformers

7027. In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made____________?
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A. less in comparison with the armature mmf

B. large in comparison with the armature mmf

C. none of the above

D. equal to that of armature mmf

7028. Which of the following methods is most accurate ?
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A. Method of average losses

B. Equivalent power method

C. Equivalent torque method

D. Equivalent current method

7029. Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?
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A. any of the above

B. medium size machines

C. large size machines

D. small size machines

7030. __________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?
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A. Soft steel

B. Aluminium

C. Cast iron

D. Cast steel

7031. Disc windings are primarily used in_____________-?
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A. medium capacity transformers

B. short capacity transformers

C. high capacity transformers

D. any of the above

7032. Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?
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A. 5 MVA

B. 2 MVA

C. 7.5 MVA

D. 10 MVA

7033. In D.C. machines the usual limit of slot pitch is________________?
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A. between 5 to 10 mm

B. between 15 to 20 mm

C. between 10 to 15 mm

D. between 25 to 35 mm

7034. On which of the following variables heat convected depends ?
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A. Gravitational constant

B. Thermal resistivity, density, specific heat

C. All of the above

D. Temperature difference between heated surface and coolant

E. Power density

7035. The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?
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A. hydrogen

B. air

C. none of the above

D. either A. or B.

7036. The flash point of transformer oil should be higher than_______________?
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A. 104C

B. 60C

C. 80C

D. 40C

7037. Materials exhibiting zero value of resistivity are known as ____________ ?
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A. conductors

B. superconductors

C. insulators

D. semiconductors

7038. The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?
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A. winding pitch

B. back pitch

C. commutator pitch

D. front pitch

7039. For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
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A. 1.6 Wb/m2

B. None of the above

C. 1.0 Wb/m2

D. 1.1 Wb/m2

E. 1.3 Wb/m2

7040. The slot leakage can be calculated by making which of the following assumptions ?
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A. All of the above

B. The leakage path is straight across the slot and around the iron at the bottom

C. The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero

D. The current in the slot conductors is uniformly distributed over their cross-section

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