Questions on Electrolysis and Storage of Batteries Multiple choice Questions and Answers pdf

91. A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.
(a) 1.0
(b) 1.5
(c) 2.4
(d) 2.9
Ans: c

92. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into
(a) Pb02
(6) PbSC-4
(c) PbO
(d) Pb
Ans: b

93. Chargmg of sulphated battery produces ____ heat.
(a) no
(b) very little
(c) less
(d) more
Ans: d

94. Hydrogen evolved during charging produces explosive mixture when it is more than
(a) 2%
(b) 4%
(c) 6%
(d) 8%
Ans: d

95. Weston standard cell at 20°C has voltage of ____ volts.
(a) 0.8
(b) 0.9
(c) 1.0187
(d) 1.5
Ans: c

96. Extent of corrosion in the underground metal work depends upon
(a) amount of moisture
(b) type of metals
(c) type of soil chemicals
(d) all above factors
Ans: d

97. Mercury cell has which of the following characteristics ?
(a) Flat discharge current-voltage curve
(6) High power to weight ratio
(c) Comparatively longer shelf life under adverse conditions of high temperature and humidity
(d) All of the above
Ans: d

98. Charging a sulphated battery at high rate results in
(a)     boiling of electrolyte due to gassing
(b)     warping of plates
(c) damage to separators, cell caps covers and battery case due to ex¬cessive temperature
(d) all above
Ans: d

99. Short circuiting of a cell may be caused
(a)   buckling of plates
(b) faulty separators
(c) lead particles forming circuit between positive and negative plates
(d) excessive accumulation of sediment
(e) any one of above
Ans: e

100. In a battery cover is placed over the element and sealed to the top of the battery container. This is done
(a)     to reduce evaporation of water from electrolyte
(b)     to exclude dirt and foreign matter from the electrolyte
(c) to discharge both of the above functions
(d) to discharge none of the above functions
Ans: c

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