Related Questions

The ampere-hour efficiency of a leadacid cell is normally between
A 20 to 30%
B 40 to 50%
C 60 to 70%
D 90 to 95%
Which of the following factors adversely affects the capacity of the leadacid battery ?
A Temperature of surroundings
B Specific gravity of electrolyte
C Rate of discharge
D All of the above
In constant voltage charging method, the charging current from discharged to fully charged condition
A decreases
B increases
C remains constant
D none of the above
Under normal charging rate, the charging current should be
A 10% of capacity
B 20% of capacity
C 30% of capacity
D 40% of capacity
During the charging and discharging of a nickel-iron cell
A corrosive fumes are produced
B water is neither formed nor absorbed
C nickel hydroxide remains unsplit
D its e.m.f. remains constant
Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.
A passive
B active
C redundant
D inert
The average charging voltage for alkali cell is about
A 1 V
B 1.2 V
C 1.7 V
D 2.1 V
As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
A reducing time of charging
B increasing cell capacity
C both (A) and (B)
D avoiding excessive gassing
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as
A consolidated drained test
B consolidated undrained test
C unconsolidated drained test
D unconsolidated undrained test
During charging the specific gravity of the electrolyte of a lead-acid battery
A increases
B decreases
C remains the same
D becomes zero

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