Electrolysis and Storage of Batteries

61. Local action in a battery is indicated by

1. excessive gassing under load conditions
2. excessive drop in the specific gravity of electrolyte even when the cell is on open circuit
3. both (a) and (b)
4. none of the above

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62. Mercury cell has which of the following characteristics ?

1. Flat discharge current-voltage curve
2. High power to weight ratio
3. Comparatively longer shelf life under adverse conditions of high temperature and humidity
4. All of the above

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63. Negative plate of an Edison cell is made of

1. copper
2. lead
3. iron
4. silver oxide

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64. On overcharging a battery

1. it will bring about chemical change in active materials
2. it will increase the capacity of the battery
3. it will raise the specific gravity of the electrolyte
4. none of the above will occur

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

1. 40%
2. 60%
3. 70%
4. 80%

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66. Over charging

1. produces excessive gassing
2. loosens the active material
3. increases the temperature resulting in buckling of plates
4. all above

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67. Persons preparing electrolyte should wear

1. goggles or other face shield
2. rubber
3. rubber boots and gloves
4. all above safety devices

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68. Petroleum jelly is applied to the electrical connections to the lead-acid battery

1. prevent local heating
2. prevent short-circuiting
3. reduce path resistance
4. prevent corrosion

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69. Satellite power requirement is provided through

1. solar cells
2. dry cells
3. nickel-cadmium cells
4. lead-acid batteries

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70. Self charge of a Ni-Fe cell is _________ Edison cell.

1. equal to
2. less than
3. more than
4. much more than

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