Objective Electrolysis and Storage of Batteries Questions and Answers pdf

61. Batteries are charged by
(a) rectifiers
(b) engine generator sets
(c) motor generator sets
(d) any one of the above methods
 Ans: d

62. Cell short circuit results in
(a) low sp. gravity electrolyte
(b) abnormal high temperature
(c) reduced gassing on charge
(d) all above
Ans: d

63. Internal resistance of a cell is reduced by
(a) using vent plug to permit gas formed during discharge
(b) increasing the plate area
(c) putting plates very close together
(d) all above methods
Ans: d

64. Capacity of dry cells is
(a) more when it is supplying current for intermittent periods
(b) more when it is supplying current for continuous periods
(c) unaffected by the type of discharge
(d) none of the above
Ans: a

65. Battery container should be acid resistance, therefore it is made up of
(a) glass
(b) plastic
(c) wood
(d) all above
Ans: d

66. Sulphated cells are indicated by
(a)     the loss of capacity of the cell
(6)     the decrease of the specific gravity
(c) the low voltage of the cell on discharge
(d) all above conditions
Ans: d

67. In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3
(a)     6 parts of acid to 4 parts of water
(b)     4 parts of acid to 4 parts of water
(c) 4 parts of acid to 6 parts of water
(d) 4 parts of acid to 8 parts of water
Ans: c

68. Local action in a battery is indicated by
(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
Ans: d

69. Following will happen if battery charging rate is too high
(a) excessive gassing will occur
(b) temperature rise will occur
(c) bulging and buckling of plates will occur
(d) all above will occur
Ans: d

70. Internal resistance of a cell is due to
(a) resistance of electrolyte
(b) electrode resistance
(c)     surface contact resistance between electrode and electrolyte
(d) all above
Ans: d

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