Electrolysis and Storage of Batteries

31. Excessive charging a battery tends to

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

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32. Excessive formation of lead sulphate on the surface of the plates happens because of

1. allowing a battery to stand in discharged condition for a long time
2. topping up with electrolyte
3. persistent undercharging
4. low level of electrolyte
5. all above

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33. Extent of corrosion in the underground metal work depends upon

1. amount of moisture
2. type of metals
3. type of soil chemicals
4. all above factors

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34. Five 2 V cells are connected in parallel. The output voltage is

1. 1 V
2. 1.5 V
3. 1.75 V
4. 2 V

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35. Following will happen if battery charging rate is too high

1. excessive gassing will occur
2. temperature rise will occur
3. bulging and buckling of plates will occur
4. all above will occur

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

1. Loss of capacity
2. Loss of life
3. Corrosion of the grids of the plate
4. All above

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37. Following will occur if level of electrolyte falls below plates

1. capacity of the cell is reduced
2. life of the cell is reduced
3. open plates are converted to lead sulphate
4. all above

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38. For a cell to work, which of the following condition(s) become necessary ?

1. Two electrodes of different meta's should be inserted in the electrolyte, not touching each other
2. Electrolyte must chemically react with one of the electrodes
3. Electrolyte liquid or paste should be conducting
4. All above three conditions are necessary

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39. Hydrogen evolved during charging produces explosive mixture when it is more than

1. 2%
2. 4%
3. 6%
4. 8%

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40. If a battery is wrongly connected on charge following will happen

1. current delivered by the battery will be high
2. current drawing will be nil
3. current drawing will be very small
4. current drawing will be very high

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