electrical engineering MCQs – Page 359

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 Review each marked answer and report any item that may be outdated or unclear.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
7161. Cells are connected in parallel to__________?
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A. increase the current capacity

B. increase the efficiency

C. increase the voltage output

D. increase the internal resistance

7162. In order that a hydrometer may float vertically in electrolyte its C.G. should be___________?
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A. displaced sideways

B. raised

C. lowered

D. undisturbed

7163. The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is____________?
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A. always less than one

B. none of the above

C. just one

D. always greater than one
7164. The body of Edison cell is made of___________?
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A. aluminium

B. nickel plated steel

C. rubber

D. bakelite

7165. Under normal charging rate, the charging current should be__________?
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A. 10% of capacity

B. 40% of capacity

C. 30% of capacity

D. 20% of capacity

7166. The active materials of a nickel-iron battery are___________?
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A. nickel hydroxide

B. 21% solution of KOH

C. all of the above

D. powdered iron and its oxide

7167. Life of the Edison cell is at least_____________?
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A. eight years

B. ten years

C. five years

D. seven years

7168. In ________ system the charging current is intermittently controlled at either a maximum or minimum value
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A. an equalizing charge

B. floating charge

C. trickle charge

D. two rate charge control
7169. Which of the following has lower specific gravity V__________?
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A. Water

B. Any of the above

C. Concentrated H2SO4

D. Dilute H2S04

7170. During charging the specific gravity of the electrolyte of a lead-acid battery
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A. increases

B. remains the same

C. becomes zero

D. decreases

7171. During discharge, the active material of both the positive and negative plates is changed to___________?
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A. PbO

B. Pb

C. Pb02

D. PbS04
7172. Petroleum jelly is applied to the electrical connections to the lead-acid battery___________?
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A. reduce path resistance

B. prevent short-circuiting

C. prevent corrosion

D. prevent local heating

7173. The capacity of a lead-acid cell is measured in_____________?
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A. ampere-hours

B. watt-hours

C. watts

D. amperes

7174. Mercury cell has which of the following characteristics ____________?
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A. All of the above

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

C. High power to weight ratio

D. Flat discharge current-voltage curve

7175. Persons preparing electrolyte should wear___________?
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A. rubber boots and gloves

B. rubber

C. all above safety devices

D. goggles or other face shield

7176. The best indication about the state of charge on a lead-acid battery is given by____________?
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A. none of the above

B. specific gravity of electrolyte

C. temperature of electrolyte

D. output voltage

7177. Local action in a battery is indicated by____________?
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A. excessive gassing under load conditions

B. excessive drop in the specific gravity of electrolyte even when the cell is on open circuit

C. both A. and (b)

D. none of the above
7178. Lead-acid cell has a life of nearly charges and discharges______________?
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A. 1250

B. 700

C. 500

D. 1000

7179. Hydrogen evolved during charging produces explosive mixture when it is more than___________?
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A. 4%

B. 8%

C. 6%

D. 2%

7180. Which of the following battery is used for air-craft _____________?
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A. Nickel-iron battery

B. Lead-acid battery

C. Dry cell battery

D. Silver oxide battery