electrical engineering MCQs – Page 65

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 Review each marked answer and report any item that may be outdated or unclear.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

1281. Application of Nortons theorem to a circuit yields:________________?
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A. equivalent current source and impedance in parallel

B. equivalent current source and impedance in series

C. equivalent impedance

D. equivalent current source

1282. Which of the following losses, in a synchronous motor, does not vary with load?
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A. Windage loss

B. Any of the above

C. Copper losses

D. None of the above

1283. A passive network is one which contains____________?
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A. only variable resistances

B. only two sources of e.m.f. in it

C. only some sources of e.m.f. in it

D. no source of e.m.f. in it

1284. When the voltage applied to a synchronous motor is increased, which of the following will reduce?
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A. Stator flux

B. Pull in torque

C. Both A. and (b)

D. None of the above

1285. In a power plant if the maximum demand on the plant is equal to the plant capacity, then
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A. diversity factor will be unity

B. load factor will be unity

C. plant reserve capacity will be zero

D. load factor will be nearly 60%

1286. __________ industry has the least power consumption per ton of product?
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A. Soap

B. Sugar

C. Caustic soda

D. Vegetable oil

1287. Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?
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A. parallel

B. either A. or (b)

C. series

D. none of the above

1288. High load factor indicates
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A. average power used during the period

B. either of the above

C. none of the above

D. average kWh (kW) energy consumption during the period

1289. A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will___________?
0

A. none of the above

B. remain same

C. improve

D. go down

1290. The superposition theorem requires as many circuits to be solved as there are____________?
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A. sources

B. sources, nodes and meshes

C. nodes

D. sources and nodes

1291. All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?
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A. all above

B. resistance only

C. capacitance only

D. inductance only

1292. For a voltage source:
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A. None

B. the source e.m.f. and terminal voltage are equal

C. terminal voltage cannot be higher than source e.m.f.

D. terminal voltage is always lower than source e.m.f.

1293. A synchronous machine with low value of short-circuit ratio has___________?
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A. good speed regulation

B. high stability limit

C. lower stability limit

D. good voltage regulation

E. none of the above

1294. Large capacity generators are invariably___________?
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A. forced air cooled

B. water cooled

C. natural air cooled

D. hydrogen cooled

1295. For which of the following power plants highly skilled engineers are required for running the plants?
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A. Solar power plants

B. Nuclear power plants

C. Gas turbine power plants

D. Hydro-electric power plants

1296. Which of the following is the essential requirement of peak load plant ?
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A. It should run at high speed

B. It should be capable of starting quickly

C. It should produce high voltage

D. It should be small in size

1297. An SCR is made up of silicon because_____________?
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A. silicon has large leakage voltage than germanium

B. silicon has large leakage current than germanium

C. silicon has small leakage voltage than germanium

D. silicon has small leakage current than germanium

1298. The shaft of synchronous motor is made of____________?
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A. alnico

B. mild steel

C. stainless steel

D. chrome steel

1299. Annual operating expenditure of a power plant consists of____________?
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A. semi-fixed charges

B. running charges

C. fixed charges

D. all of the above

1300. Diversity factor has direct effect on the____________?
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A. fixed cost of unit generated

B. running cost of unit generated

C. both A. and B.

D. neither A. nor B.

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