electrical engineering MCQs – Page 361

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 Review each marked answer and report any item that may be outdated or unclear.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
7201. When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?
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A. brown

B. none of above

C. dark grey

D. dark brown
7202. Charging a sulphated battery at high rate results in___________?
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A. all above

B. damage to separators, cell caps covers and battery case due to excessive temperature

C. warping of plates

D. boiling of electrolyte due to gassing

7203. Undercharging___________?
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A. increases specific gravity of the electrolyte

B. increases the temperature

C. reduces specific gravity of the electrolyte

D. produces excessive gassing

7204. During the charging and discharging of a nickel-iron cell____________?
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A. corrosive fumes are produced

B. its e.m.f. remains constant

C. water is neither formed nor absorbed

D. nickel hydroxide remains unsplit

7205. 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

7206. Satellite power requirement is provided through________?
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A. dry cells

B. solar cells

C. nickel-cadmium cells

D. lead-acid batteries

7207. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________?
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A. PbO

B. PbSC-4

C. Pb02

D. Pb

7208. Electrolyte used in an Edison cell is___________?
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A. HN03

B. NaOH

C. HC1

D. KOH
7209. Which of the following cell has a. reversible chemical reaction ___________?
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A. Carbon-zinc

B. Silver-oxide

C. Mercury oxide

D. Lead-acid
7210. Which of the following primary cells has the lowest voltage_________ ?
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A. Lithium

B. Zinc-chloride

C. Mercury

D. Carbon-zinc

7211. In a lead-acid battery the energy is stored in the form of___________?
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A. chemical energy

B. electromagnetic energy

C. charged ions

D. electrostatic energy

7212. A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state
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A. 1

B. 2.4

C. 2.9

D. 1.5

7213. A constant-voltage generator has___________?
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A. low internal resistance

B. high internal resistance

C. minimum efficiency

D. minimum current capacity

7214. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
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A. one part H2O, three parts H2SO4

B. three parts H2O, one part H2SO4

C. all H2S04

D. two parts H2O, two parts H2SO4

7215. The common impurity in the electrolyte of lead-acid battery is_____________?
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A. chlorine

B. dust particles

C. lead crystals

D. iron
7216. The capacity of a lead-acid cell does not depend on its___________?
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A. rate of charge

B. temperature

C. quantity of active material

D. rate of discharge

7217. Battery container should be acid resistance, therefore it is made up of___________?
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A. glass

B. wood

C. all above

D. plastic

7218. Which of the following is the voltage for single phase A.C. system ?
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A. 22 V

B. None of the above

C. 5 kV

D. 440 V

E. 15 kV

7219. An ideal traction system should have_______________?
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A. all of the above

B. high starting tractive effort

C. easy speed control

D. equipment capable of with standing large temporary loads

7220. Which of the following drives is suitable for mines where explosive gas exists ?
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A. Steam engine

B. Battery locomotive

C. Diesel engine

D. Any of the above