electrolysis and storage of batteries MCQs – Page 4

Practise focused electrolysis and storage of batteries questions with marked answers for exam preparation and subject revision.

electrolysis and storage of batteries Mcqs
61. When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in___________?
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A. charged state

B. discharged state

C. both (A) and (B)

D. active state

62. The capacity of a lead-acid cell depends on
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A. rate of discharge

B. all above

C. temperature

D. density of electrolyte

E. quantity of active materials

63. 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

64. 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

65. 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
66. The body of Edison cell is made of___________?
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A. aluminium

B. nickel plated steel

C. rubber

D. bakelite

67. 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

68. 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

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

B. ten years

C. five years

D. seven years

70. 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
71. 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

72. 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

73. 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
74. 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

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

B. watt-hours

C. watts

D. amperes

76. 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

77. 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

78. 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

79. 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
80. Lead-acid cell has a life of nearly charges and discharges______________?
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A. 1250

B. 700

C. 500

D. 1000