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

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cto check the level of electrolyte

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d to do all above functions

✓



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


apositive active material

✖


bnegative active material

✓


cpassive material

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dnone of the above

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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

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btopping up with electrolyte

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cpersistent undercharging

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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

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cproduces excessive gassing

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dincreases the temperature

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


atwo rate charge control

✓


btrickle charge

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c floating charge

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d an equalizing charge

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Internal short circuits are caused by___________?


abreakdown of one or more separators

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bexcess accumulation of sediment at the bottom of the cell

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cboth (A) and (B)

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d none of the above

✓


View Answer none of the above

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


aamperes

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bampere-hours

✓


cwatts

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dwatt-hours

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View Answer ampere-hours

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