Electrolysis and storage of batteries Archives

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

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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