Electrical Engineering MCQs

Page No. 207

It is noticed that durum charging___________?


athere is a rise in voltage


benergy is absorbed by the cell


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


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


b lower e.m.f.


csmall quantity of electrolyte used


d higher internal resistance



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


a one part H2O, three parts H2SO4


b two parts H2O, two parts H2SO4


cthree parts H2O, one part H2SO4


dall H2S04



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


a both anode and cathode become PbS04


b specific gravity of H2SO4 decreases


cvoltage of the cell decreases


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


bactive


credundant


dinert


View Answer active

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


acorrosive fumes are produced


bwater is neither formed nor absorbed


cnickel hydroxide remains unsplit


d its e.m.f. remains constant



A dead storage battery can be revived by___________?


aadding distilled water


badding so-called battery restorer


ca dose of H2SO4


d none of the above


View Answer none of the above

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


a 1 V


b 1.5 V


c1.75 V


d 2 V


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


bincreasing cell capacity


cboth (A) and (B)


davoiding excessive gassing


View Answer both (A) and (B)

The capacity of a battery is expressed in terms of____________?


acurrent rating


bvoltage rating


campere-hour rating


dnone of the above


View Answer ampere-hour rating

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