Electrical Engineering MCQs

Page No. 204

Each cell has a vent cap________?


ato allow gases out when the cell is on charge


bto add water to the cell if needed


cto check the level of electrolyte


d to do all above functions



In a lead-acid cell, lead is called as____________?


apositive active material


bnegative active material


cpassive material


dnone of the above



The effect of sulphation is that the internal resistance__________?


aincreases


bdecreases


cremains same


dnone of the above


View Answer increases

The lead-acid cell should never be discharged beyond____________?


a1.8 V


b1.9 V


c2 V


d2.1 V


View Answer 1.8 V

Excessive formation of lead sulphate on the surface of the plates happens because of___________?


a allowing a battery to stand in discharged condition for a long time


btopping up with electrolyte


cpersistent undercharging


d all above


View Answer all above

The substances which combine together to store electrical energy during the charge are called ________ materials


a active


bpassive


c inert


ddielectric


View Answer active

Undercharging___________?


areduces specific gravity of the electrolyte


bincreases specific gravity of the electrolyte


cproduces excessive gassing


dincreases the temperature



In ________ system the charging current is intermittently controlled at either a maximum or minimum value


atwo rate charge control


btrickle charge


c floating charge


d an equalizing charge



Internal short circuits are caused by___________?


abreakdown of one or more separators


bexcess accumulation of sediment at the bottom of the cell


cboth (A) and (B)


d none of the above


View Answer none of the above

The capacity of a lead-acid cell is measured in_____________?


aamperes


bampere-hours


cwatts


dwatt-hours


View Answer ampere-hours

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