electrical engineering MCQs – Page 83

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 Review each marked answer and report any item that may be outdated or unclear.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

1641. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?
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A. 220V3V

B. 220 V

C. 220/V3 V

D. none of the above

1642. In the case of an unsymmetrical alternating current the average value must always be taken over__________?
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A. the whole cycle

B. the half cycle

C. the quarter cycle

D. unsymmetrical part of the wave form

1643. In single core cables armouring is not done to________?
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A. avoid excessive sheath losses

B. none of the above

C. either of the above

D. make it flexible

1644. The insulating material should have____________?
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A. high resistivity

B. low permittivity

C. all of the above

D. high dielectric strength

1645. In congested areas where excavation is expensive and inconvenient draw in system of laying of underground cables is often adopted
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A. No

B. Yes

1646. In an A.C. circuit power is dissipated in____________?
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A. inductance only

B. resistance only

C. capacitance only

D. none of the above

1647. Which of the following refers to a parallel circuit ?
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A. The equivalent resistance is greater than any one of the resistors

B. The voltage across element is in proportion to its resistance value

C. The current through each element is same

D. The current through any one element is less than the source current

1648. Solid type cables are considered unreliable beyond 66 kV because___________?
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A. there is a danger of breakdown of insulation due to the presence of voids

B. skin effect dominates on the conductor

C. of corona loss between conductor and sheath material

D. insulation may melt due to higher temperature

1649. In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3
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A. 4 parts of acid to 8 parts of water

B. 6 parts of acid to 4 parts of water

C. 4 parts of acid to 6 parts of water

D. 4 parts of acid to 4 parts of water

1650. Conduit pipes are normally used to protect _______ cables
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A. PVC sheathed cables

B. all of the above

C. armoured

D. unsheathed cables

1651. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?
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A. 141.4 V

B. 282.8 V

C. 111 V

D. 100 V

1652. The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________?
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A. Gausss law

B. Newtons law

C. Faradays law of electromagnetic

D. Faradays law of electrolysis

1653. Excessive charging a battery tends to____________?
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A. bring about all above changes

B. produce gassing

C. to corrode the positive plates into lead peroxide thereby weakening them physically

D. increase the internal resistance of the battery

1654. The insulating material for cables should____________?
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A. have all above properties

B. be non-inflammable

C. be acid proof

D. be non-hygroscopic

1655. For a frequency of 200 Hz, the time period will be__________?
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A. 0.05 s

B. 0.5 s

C. 0.0005 s

D. 0.005 s

1656. Empire tape is__________?
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A. vulcanised rubber

B. impregnated paper

C. varnished cambric

D. none of the above

1657. Level of electrolyte in a cell should be ________ the level of plates
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A. equal to

B. above

C. none of the above

D. below

1658. The internal resistance of a lead-acid cell is that of Edison cell____________?
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A. equal to

B. none of the above

C. more than

D. less than

1659. The substances which combine together to store electrical energy during the charge are called ________ materials
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A. active

B. dielectric

C. inert

D. passive

1660. Time constant of an inductive circuit_________?
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A. increases with increase of inductance and decrease of resistance

B. increases with decrease of inductance and increase of resistance

C. increases with the increase of inductance and the increase of resistance

D. increases with the decrease of inductance and decrease of resistance

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