Electrical Engineering MCQs

Page No. 207

It is noticed that durum charging___________?


athere is a rise in voltage

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benergy is absorbed by the cell

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c the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)

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dall of the above

✓


View Answer all of the above

As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?


a compactness

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b lower e.m.f.

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csmall quantity of electrolyte used

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d higher internal resistance

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In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?


a one part H2O, three parts H2SO4

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b two parts H2O, two parts H2SO4

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cthree parts H2O, one part H2SO4

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dall H2S04

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It is noticed that during discharging the following does not happen___________?


a both anode and cathode become PbS04

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b specific gravity of H2SO4 decreases

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cvoltage of the cell decreases

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dthe cell absorbs energy

✓



Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials


apassive

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bactive

✓


credundant

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dinert

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View Answer active

During the charging and discharging of a nickel-iron cell____________?


acorrosive fumes are produced

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bwater is neither formed nor absorbed

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cnickel hydroxide remains unsplit

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d its e.m.f. remains constant

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A dead storage battery can be revived by___________?


aadding distilled water

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badding so-called battery restorer

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ca dose of H2SO4

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d none of the above

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View Answer none of the above

Five 2 V cells are connected in parallel. The output voltage is__________?


a 1 V

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b 1.5 V

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c1.75 V

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d 2 V

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View Answer 2 V

As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?


areducing time of charging

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bincreasing cell capacity

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cboth (A) and (B)

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davoiding excessive gassing

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View Answer both (A) and (B)

The capacity of a battery is expressed in terms of____________?


acurrent rating

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bvoltage rating

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campere-hour rating

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dnone of the above

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View Answer ampere-hour rating

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