Electrolysis and storage of batteries

21. Negative plate of an Edison cell is made of

copper
lead
iron
silver oxide

Detailed SolutionNegative plate of an Edison cell is made of

22. In constant-current charging method, the supply voltage from discharged to fully charged condition

decreases
increases
remains constant
none of the above

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

23. The capacity of a lead-acid cell does not depend on its

temperature
rate of charge
rate of discharge
quantity of active material

Detailed SolutionThe capacity of a lead-acid cell does not depend on its

24. Persons preparing electrolyte should wear

goggles or other face shield
rubber
rubber boots and gloves
all above safety devices

Detailed SolutionPersons preparing electrolyte should wear

25. On the average the ampere-hour efficiency of an Edison cell is about

40%
60%
70%
80%

Detailed SolutionOn the average the ampere-hour efficiency of an Edison cell is about

26. The internal resistance of a lead-acid cell is that of Edison cell

Less than
More than
Equal to
None of the above

Detailed SolutionThe internal resistance of a lead-acid cell is that of Edison cell

27. Following will happen if the specific gravity of electrolyte becomes more than 1.23.

Loss of capacity
Loss of life
Corrosion of the grids of the plate
All above

Detailed SolutionFollowing will happen if the specific gravity of electrolyte becomes more than 1.23.

28. Undercharging

Reduces specific gravity of the electrolyte
Increases specific gravity of the electrolyte
Produces excessive gassing
Increases the temperature

Detailed SolutionUndercharging

29. Sulphated cells are indicated by

the loss of capacity of the cell
the decrease of the specific gravity
the low voltage of the cell on discharge
all above conditions

Detailed SolutionSulphated cells are indicated by

30. The internal resistance of an alkali cell is nearly _____ times that of the lead-acid cell.

two
three
four
five

Detailed SolutionThe internal resistance of an alkali cell is nearly _____ times that of the lead-acid cell.

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