971. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________?
A. Pb02
B. PbSC-4
C. PbO
D. Pb

972. Specific gravity of electrolyte in Edison cell is_____________?
A. 0.8
B. 0.95
C. 1.1
D. 1.21

973. 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

974. Weston standard cell at 20°C has voltage of _______ volts
A. 0.8
B. 0.9
C. 1.0187
D. 1.5

975. Charging of sulfated battery produces _________ heat
A. no
B. very little
C. less
D. more

976. 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

977. Which of the following primary cells has the lowest voltage_________ ?
A. Lithium
B. Zinc-chloride
C. Mercury
D. Carbon-zinc

978. Mercury cell has which of the following characteristics ____________?
A. Flat discharge current-voltage curve
B. High power to weight ratio
C. Comparatively longer shelf life under adverse conditions of high temperature and humidity
D. All of the above

979. 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

980. 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 excessive temperature
D. all above

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