1) Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials a. passive b. active c. redundant d. inert
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2) During the charging and discharging of a nickel-iron cell____________? a. corrosive fumes are produced b. water is neither formed nor absorbed c. nickel hydroxide remains unsplit d. its e.m.f. remains constant
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3) A dead storage battery can be revived by___________? a. adding distilled water b. adding so-called battery restorer c. a dose of H2SO4 d. none of the above
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4) Five 2 V cells are connected in parallel. The output voltage is__________? a. 1 V b. 1.5 V c. 1.75 V d. 2 V
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5) As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________? a. reducing time of charging b. increasing cell capacity c. both (A) and (B) d. avoiding excessive gassing
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6) The capacity of a battery is expressed in terms of____________? a. current rating b. voltage rating c. ampere-hour rating d. none of the above
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7) Cells are connected in series in order to_____________? a. increase the voltage rating b. increase the current rating c. increase the life of the cells d. none of the above
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8) The best indication about the state of charge on a lead-acid battery is given by____________? a. output voltage b. temperature of electrolyte c. specific gravity of electrolyte d. none of the above
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9) The output voltage of a charger is__________? a. less than the battery voltage b. higher than the battery voltage c. the same as the battery voltage d. none of the above
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10) The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is____________? a. just one b. always greater than one c. always less than one d. none of the above
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11) The storage battery generally used in electric power station is__________? a. nickel-cadmium battery b. zinc-carbon battery c. lead-acid battery d. none of the above
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12) During the charging of a lead-acid cell__________? a. its voltage increases b. it gives out energy c. its cathode becomes dark chocolate brown in colour d. specific gravity of H2SO4 decreases
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13) The active materials on the positive and negative plates of a fully charged lead-acid battery are_______? a. lead and lead peroxide b. lead sulphate and lead c. lead peroxide and lead d. none of the above
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14) The capacity of a lead-acid cell does not depend on its___________? a. temperature b. rate of charge c. rate of discharge d. quantity of active material
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15) The charge required to liberate one gram equivalent of any substance is known as _________ constant a. time b. Faraday’s c. Boltzman
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16) When a lead-acid battery is in fully charged condition, the color of its positive plate is__________? a. dark grey b. brown c. dark brown d. none of above
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17) The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________? a. Newton’s law b. Faraday’s law of electromagnetic c. Faraday’s law of electrolysis d. Gauss’s law
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18) During charging the specific gravity of the electrolyte of a lead-acid battery a. increases b. decreases c. remains the same d. becomes zero
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19) The active materials of a nickel-iron battery are___________? a. nickel hydroxide b. powdered iron and its oxide c. 21% solution of KOH d. all of the above
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