electrical engineering MCQs – Page 355

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 Review each marked answer and report any item that may be outdated or unclear.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

7081. electromagnets generally function as holding magnets ?
0

A. None of the above

B. Portative

C. Either of the above

D. Tractive

7082. The design of mechanical parts is particularly important in case of __________ speed machines?
0

A. any of the above

B. high

C. medium

D. low

7083. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?
0

A. 60 MW

B. 10 MW

C. 150 MW

D. 30 MW

7084. cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?
0

A. Indirect

B. Any of the above

C. Direct

D. Conventional

7085. ___________ brushes are fragile and cause excessive wear of commutator?
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A. Electro graphitic

B. Hard carbon

C. Natural graphite

D. Metal graphite

7086. D.C. servomotors are used in______________?
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A. purely D.C. control systems

B. purely AC. control systems

C. both D.C. and AC. control systems

D. none of the above

7087. In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?
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A. 4 to 5 times greater

B. none of the above

C. 3 to 4 times greater

D. 2 to 3 times greater

7088. The efficiency of a machine should be as ____________ as possible to reduce the operating cost?
0

A. high

B. none of the above

C. either of the above

D. low

7089. Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?
0

A. large size

B. any of the above size

C. medium size

D. small size

7090. For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
0

A. 2.2 to 3.2 A/mm2

B. 1.5 to 2.0 A/mm2

C. 3.2 to 4.2 A/mm2

D. 1.0 to 1.2 A/mm2

7091. Dummy coil should not be used in_________________?
0

A. small machines

B. none of the above

C. large machines

D. either A. or B.

7092. The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?
0

A. 0.8 to 1.0 Wb/m2

B. 0.5 to 0.8 Wb/m2

C. 1.4 to 1.8 Wb/m2

D. 1.1 to 1.35 Wb/m2

7093. Which of the following is the major consideration to evolve a good design ?
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A. Durability

B. All of the above

C. Compliance with performance criteria as laid down in specifications

D. Cost

7094. The thermal conductivity of hydrogen is _____________ times that of air?
0

A. 5

B. 7

C. 2

D. 3

7095. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
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A. Aluminium

B. Cast-iron

C. Copper

D. Steel

7096. _______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?
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A. Aluminium

B. Silver

C. Steel

D. Copper

7097. In a D.C. machine, the value of peripheral speed should not, normally, exceed___________?
0

A. 10 m/s

B. 20 m/s

C. 40 m/s

D. 30 m/s

7098. Which of the following is an advantage of hydrogen cooling ?
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A. Smaller size of coolers

B. Increase in efficiency

C. Increase in life

D. All of the above

E. Increase in ratings

7099. For a cell to work, which of the following condition(s) become necessary ___________?
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A. Two electrodes of different metas should be inserted in the electrolyte, not touching each other

B. All above three conditions are necessary

C. Electrolyte must chemically react with one of the electrodes

D. Electrolyte liquid or paste should be conducting

7100. Cell short circuit results in_________?
0

A. reduced gassing on charge

B. abnormal high temperature

C. low sp. gravity electrolyte

D. all above

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