electrical engineering MCQs – Page 84

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 Review each marked answer and report any item that may be outdated or unclear.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
1661. The electrostatic stress in underground cables is_________?
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A. none of the above

B. same at the conductor and the sheath

C. zero at the conductor as well as on the sheath

D. maximum at the conductor and minimum at the sheath

E. minimum at the conductor and maximum at the sheath

1662. Mercury cell has which of the following characteristics ____________?
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A. Flat discharge current-voltage curve

B. All of the above

C. High power to weight ratio

D. Comparatively longer shelf life under adverse conditions of high temperature and humidity

1663. Low tension cables are generally used up to___________?
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A. 500 V

B. 1000 V

C. 200 V

D. 700 V

1664. On the average the ampere-hour efficiency of an Edison cell is about__________?
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A. 80%

B. 70%

C. 60%

D. 40%

1665. Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?
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A. 90% of the maximum value

B. 25% of maximum value

C. 63% of maximum value

D. 50% of maximum value

1666. Pure inductive circuit____________?
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A. takes power from the line during some part of the cycle and then returns back to it during other part of the cycle

B. does not take power at all from a line

C. consumes some power on average

D. none of the above

1667. Extent of corrosion in the underground metal work depends upon___________?
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A. type of metals

B. type of soil chemicals

C. all above factors

D. amount of moisture

1668. Magnitude of current at resonance in R-L-C circuit________?
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A. depends upon the magnitude of R, Land C

B. depends upon the magnitude of C

C. depends upon the magnitude of L

D. depends upon the magnitude of R
1669. PVC stands for____________?
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A. none of the above

B. polyvinyl chloride

C. pressed and varnished cloth

D. post varnish conductor

E. positive voltage conductor

1670. Which of the following primary cells has the lowest voltage_________ ?
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A. Lithium

B. Carbon-zinc

C. Zinc-chloride

D. Mercury
1671. Ohm is unit of all of the following except___________?
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A. capacitive reactance

B. resistance

C. capacitance

D. inductive reactance

1672. Five 2 V cells are connected in parallel. The output voltage is__________?
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A. 1 V

B. 2 V

C. 1.75 V

D. 1.5 V

1673. The advantage of oil filled cables is_________?
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A. smaller overall size

B. more perfect impregnation

C. no ionisation, oxidation and formation of voids

D. all of the above
1674. The bedding on a cable consists of____________?
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A. none of the above

B. jute

C. any of the above

D. hessian cloth

1675. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
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A. 400 cm

B. 10 cm

C. 2 cm

D. 50 cm
1676. Dry cell is modification of____________?
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A. Lead-acid cell

B. Deniell cell

C. Edison cell

D. Leclanche cell
1677. The phosphors for which of the following pair are 180 out of phase for VL, VC and VR______?
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A. Vc and VR

B. Vc and VL

C. VL and VR

D. none of the above

1678. The relative permittivity of rubber is____________?
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A. between 8 and 10

B. between 12 and 14

C. between 5 and 6

D. between 2 and 3
1679. In order that a hydrometer may float vertically in electrolyte its C.G. should be___________?
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A. displaced sideways

B. lowered

C. raised

D. undisturbed

1680. At _______ frequencies the parallel R-L circuit behaves as purely resistive
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A. very low

B. high

C. very high

D. low