Electrolysis and storage of batteries

1. Which of the following primary cells has the lowest voltage ?

Lithium
Zinc-chloride
Mercury
Carbon-zinc

Detailed SolutionWhich of the following primary cells has the lowest voltage ?

2. The capacity of a lead-acid cell depends on

Rate of discharge
Temperature
Density of electrolyte
All above

Detailed SolutionThe capacity of a lead-acid cell depends on

3. Internal short circuits are caused by

breakdown of one or more separators
excess accumulation of sediment at the bottom of the cell
both (A) and (B)
none of the above

Detailed SolutionInternal short circuits are caused by

4. Excessive charging a battery tends to

produce gassing
increase the internal resistance of the battery
to corrode the positive plates into lead peroxide thereby weakening them physically
bring about all above changes

Detailed SolutionExcessive charging a battery tends to

5. Internal resistance of a cell is reduced by

using vent plug to permit gas formed during discharge
increasing the plate area
putting plates very close together
all above methods

Detailed SolutionInternal resistance of a cell is reduced by

6. The following indicate that battery on charge has attained full charge

colour of electrode
gassing
specific gravity
all above

Detailed SolutionThe following indicate that battery on charge has attained full charge

7. During discharge, the active material of both the positive and negative plates is changed to

Pb
PbO2
PbO
PbSO4

Detailed SolutionDuring discharge, the active material of both the positive and negative plates is changed to

8. In ______ system the charging current is intermittently controlled at either a maximum or minimum value

two rate charge control
trickle charge
floating charge
an equalizing charge

Detailed SolutionIn ______ system the charging current is intermittently controlled at either a maximum or minimum value

9. The effect of sulphation is that the internal resistance

increases
decreases
remains same
none of the above

Detailed SolutionThe effect of sulphation is that the internal resistance

10. In constant voltage charging method, the charging current from discharged to fully charged condition

decreases
increases
remains constant
none of the above

Detailed SolutionIn constant voltage charging method, the charging current from discharged to fully charged condition

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