electrical engineering MCQs – Page 75

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
1481. In a circuit containing R, L and C, power loss can take place in____________?
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A. L only

B. C only

C. all above

D. R only
1482. High tension cables are generally used up to_____________?
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A. 132 kV

B. 66 kV

C. 33kV

D. 11kV
1483. Following will happen if battery charging rate is too high______________?
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A. all above will occur

B. excessive gassing will occur

C. bulging and buckling of plates will occur

D. temperature rise will occur

1484. If a lead-acid cell is discharged below 1.8 V the following will happen.____________?
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A. All above will occur

B. Sulphation of plates will occur

C. Internal resistance will increase

D. Capacity of cell will reduce

1485. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
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A. 84.84 sin 3141

B. 60 sin 25 t

C. 60 sin 50 t

D. 42.42 sin 314 t

1486. In a purely inductive circuit__________?
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A. reactive power is zero

B. actual power is zero

C. apparent power is zero

D. none of above is zero

1487. The surge resistance of cable is__________?
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A. 50 ohms

B. 5 ohms

C. 100 ohms

D. 20 ohms

1488. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
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A. be doubled

B. be reduced by half

C. be reduced to one fourth

D. be four times at high

1489. Negative plate of an Edison cell is made of__________?
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A. lead

B. copper

C. silver oxide

D. iron
1490. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
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A. be reduced by half

B. be four times as high

C. be reduced to one fourth

D. be doubled
1491. The following indicate that battery on charge has attained full charge___________?
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A. all above

B. gassing

C. specific gravity

D. colour of electrode

1492. Short circuiting of a cell may be caused____________?
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A. buckling of plates

B. lead particles forming circuit between positive and negative plates

C. any one of above

D. faulty separators

E. excessive accumulation of sediment

1493. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?
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A. compactness

B. higher internal resistance

C. lower e.m.f.

D. small quantity of electrolyte used

1494. Each cell has a vent cap________?
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A. to allow gases out when the cell is on charge

B. to check the level of electrolyte

C. to add water to the cell if needed

D. to do all above functions
1495. The storage battery generally used in electric power station is__________?
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A. lead-acid battery

B. nickel-cadmium battery

C. zinc-carbon battery

D. none of the above

1496. The watt-hour efficiency of a lead-acid cell varies between________?
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A. 90 to 95%

B. 40 to 60%

C. 25 to 35%

D. 70 to 80%
1497. The metallic sheath may be made of lead or lead alloy or of aluminium ?
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A. No

B. Yes

1498. The frequency of an alternating current is____________?
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A. the number of waves passing through a point in one second

B. the number of cycles generated in one minute

C. the speed with which the alternator runs

D. the number of electrons passing through a point in one second

1499. In a cable the voltage stress is maximum at____________?
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A. surface of the conductor

B. sheath

C. insulator

D. core of the conductor
1500. During the charging and discharging of a nickel-iron cell____________?
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A. nickel hydroxide remains unsplit

B. its e.m.f. remains constant

C. water is neither formed nor absorbed

D. corrosive fumes are produced