Electrical Engineering MCQs

Page No. 206

On the average the ampere-hour efficiency of an Edison cell is about__________?


a40%


b60%


c70%


d80%


View Answer 80%

The e.m.f. of an Edison cell, when fully charged, is nearly______________?


a1.4 V


b1 V


c0.9 V


d 0.8 V


View Answer 1.4 V

The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell


a two


b three


cfour


dfive


View Answer five

The capacity of a lead-acid cell depends on


arate of discharge


btemperature


cdensity of electrolyte


dall above


View Answer all above

The ampere-hour efficiency of a lead acid cell is normally between_________?


a20 to 30%


b40 to 50%


c60 to 70%


d90 to 95%


View Answer 90 to 95%

When the lead-acid cell is fully charged, the electrolyte assumes _______ appearance


adull


breddish


cbright


dmilky


View Answer milky

The active material of the positive plates of silver-zinc batteries is_________?


asilver oxide


blead oxide


clead


dzinc powder


View Answer silver oxide

The average charging voltage for alkali cell is about__________?


a1 V


b1.2 V


c1.7 V


d2.1 V


View Answer 1.7 V

The watt-hour efficiency of a lead-acid cell varies between________?


a25 to 35%


b40 to 60%


c 70 to 80%


d90 to 95%


View Answer 70 to 80%

Trickle charging of a storage battery helps to___________?


amaintain proper electrolyte level


bincrease its reserve capacity


c prevent sulphation


dkeep it fresh and fully charged



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