Electrical Engineering MCQs

Page No. 201

The following indicate that battery on charge has attained full charge___________?


acolour of electrode


b gassing


cspecific gravity


dall above


View Answer all above

Dry cell is modification of____________?


a Deniell cell


bLeclanche cell


c Lead-acid cell


dEdison cell


View Answer Leclanche cell

Excessive charging a battery tends to____________?


aproduce gassing


b increase the internal resistance of the battery


cto corrode the positive plates into lead peroxide thereby weakening them physically


dbring about all above changes



In order that a hydrometer may float vertically in electrolyte its C.G. should be___________?


alowered


braised


c undisturbed


ddisplaced sideways


View Answer lowered

Internal resistance of a cell is due to___________?


aresistance of electrolyte


b electrode resistance


csurface contact resistance between electrode and electrolyte


dall above


View Answer all above

If a lead-acid cell is discharged below 1.8 V the following will happen.____________?


aCapacity of cell will reduce


bSulphation of plates will occur


cInternal resistance will increase


dAll above will occur


View Answer All above will occur

In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3


a6 parts of acid to 4 parts of water


b 4 parts of acid to 4 parts of water


c4 parts of acid to 6 parts of water


d4 parts of acid to 8 parts of water



Cell short circuit results in_________?


alow sp. gravity electrolyte


babnormal high temperature


creduced gassing on charge


dall above


View Answer all above

Capacity of dry cells is_________?


amore when it is supplying current for intermittent periods


bmore when it is supplying current for continuous periods


cunaffected by the type of discharge


dnone of the above



Local action in a battery is indicated by____________?


aexcessive gassing under load conditions


bexcessive drop in the specific gravity of electrolyte even when the cell is on open circuit


cboth A. and (b)


dnone of the above


View Answer none of the above

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