Electrolysis and Storage of Batteries

71. Shelf life of a small dry cell is

1. equal to that of large dry cell
2. less than that of large dry cell
3. more than that of large dry cell
4. none of the above

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72. Short circuiting of a cell may be caused

1. buckling of plates
2. faulty separators
3. lead particles forming circuit between positive and negative plates
4. excessive accumulation of sediment
5. any one of above

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73. Specific gravity of electrolyte in Edison cell is

1. 0.8
2. 0.95
3. 1.1
4. 1.21

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74. Sulphated cells are indicated by

1. the loss of capacity of the cell
2. the decrease of the specific gravity
3. the low voltage of the cell on discharge
4. all above conditions

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75. The active material of the positive plates of silver-zinc batteries is

1. silver oxide
2. lead oxide
3. lead
4. zinc powder

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76. The active materials of a nickel-iron battery are

1. nickel hydroxide
2. powdered iron and its oxide
3. 21% solution of KOH
4. all of the above

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77. The active materials on the positive and negative plates of a fully charged lead- acid battery are

1. lead and lead peroxide
2. lead sulphate and lead
3. lead peroxide and lead
4. none of the above

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78. The ampere-hour efficiency of a leadacid cell is normally between

1. 20 to 30%
2. 40 to 50%
3. 60 to 70%
4. 90 to 95%

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79. The average charging voltage for alkali cell is about

1. 1 V
2. 1.2 V
3. 1.7 V
4. 2.1 V

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80. The best indication about the state of charge on a lead-acid battery is given by

1. output voltage
2. temperature of electrolyte
3. specific gravity of electrolyte
4. none of the above

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