Electrical Engineering MCQs

Page No. 201

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


acolour of electrode

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b gassing

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cspecific gravity

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dall above

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View Answer all above

Dry cell is modification of____________?


a Deniell cell

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bLeclanche cell

✓


c Lead-acid cell

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dEdison cell

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View Answer Leclanche cell

Excessive charging a battery tends to____________?


aproduce gassing

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b increase the internal resistance of the battery

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

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dbring about all above changes

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


alowered

✓


braised

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c undisturbed

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ddisplaced sideways

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View Answer lowered

Internal resistance of a cell is due to___________?


aresistance of electrolyte

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b electrode resistance

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csurface contact resistance between electrode and electrolyte

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dall above

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View Answer all above

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


aCapacity of cell will reduce

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bSulphation of plates will occur

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cInternal resistance will increase

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dAll above will occur

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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

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b 4 parts of acid to 4 parts of water

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c4 parts of acid to 6 parts of water

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d4 parts of acid to 8 parts of water

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Cell short circuit results in_________?


alow sp. gravity electrolyte

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babnormal high temperature

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creduced gassing on charge

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dall above

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View Answer all above

Capacity of dry cells is_________?


amore when it is supplying current for intermittent periods

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bmore when it is supplying current for continuous periods

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cunaffected by the type of discharge

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dnone of the above

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Local action in a battery is indicated by____________?


aexcessive gassing under load conditions

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

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cboth A. and (b)

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dnone of the above

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View Answer none of the above

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