electrical engineering MCQs – Page 360

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 Review each marked answer and report any item that may be outdated or unclear.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
7181. Dry cell is modification of____________?
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A. Edison cell

B. Lead-acid cell

C. Deniell cell

D. Leclanche cell
7182. In constant voltage charging method, the charging current from discharged to fully charged condition_____________?
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A. decreases

B. remains constant

C. none of the above

D. increases

7183. The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell
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A. four

B. two

C. five

D. three

7184. Negative plate of an Edison cell is made of__________?
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A. silver oxide

B. copper

C. iron

D. lead

7185. All the electrical connections between the battery and vehicle should be by____________?
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A. flexible cables

B. thin copper wires

C. rigid cables

D. thin aluminium wires

7186. Internal resistance of a cell is due to___________?
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A. surface contact resistance between electrode and electrolyte

B. resistance of electrolyte

C. all above

D. electrode resistance

7187. Short circuiting of a cell may be caused____________?
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A. faulty separators

B. excessive accumulation of sediment

C. buckling of plates

D. any one of above

E. lead particles forming circuit between positive and negative plates

7188. Which of the following primary cells has the highest voltage___________ ?
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A. Lithium

B. Manganese-alkaline

C. Mercury

D. Carbon-zinc

7189. The average charging voltage for alkali cell is about__________?
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A. 1.2 V

B. 2.1 V

C. 1 V

D. 1.7 V
7190. The watt-hour efficiency of a lead-acid cell varies between________?
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A. 90 to 95%

B. 25 to 35%

C. 40 to 60%

D. 70 to 80%
7191. Weston standard cell at 20C has voltage of _______ volts
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A. 0.8

B. 1.5

C. 1.0187

D. 0.9

7192. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?
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A. reducing time of charging

B. increasing cell capacity

C. both (A) and (B)

D. avoiding excessive gassing

7193. The charge required to liberate one gram equivalent of any substance is known as _________ constant
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A. Boltzman

B. Faradays

C. time

7194. Over charging______________?
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A. all above

B. increases the temperature resulting in buckling of plates

C. produces excessive gassing

D. loosens the active material

7195. The active material of the positive plates of silver-zinc batteries is_________?
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A. lead oxide

B. zinc powder

C. lead

D. silver oxide
7196. 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

7197. The following indicate that battery on charge has attained full charge___________?
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A. all above

B. colour of electrode

C. gassing

D. specific gravity

7198. Following will happen if battery charging rate is too high______________?
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A. temperature rise will occur

B. bulging and buckling of plates will occur

C. excessive gassing will occur

D. all above will occur
7199. Batteries are charged by_____________?
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A. rectifiers

B. any one of the above methods

C. engine generator sets

D. motor generator sets

7200. The ampere-hour efficiency of a lead acid cell is normally between_________?
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A. 40 to 50%

B. 20 to 30%

C. 90 to 95%

D. 60 to 70%