Electrolysis and Storage of Batteries Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Electrolysis and Storage of Batteries”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Electrolysis and Storage of Batteries Mcqs comprehensively.

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16.
When two batteries are connected in parallel, it should be ensured that___________?

They have same e.m.f.

They have same make

They have same ampere-hour capacity

They have identical internal resistance

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17.
Which of the following has lower specific gravity V__________?

Dilute H2S04

Concentrated H2SO4

Water

Any of the above

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18.
Which of the following battery is used for air-craft _____________?

Lead-acid battery

Nickel-iron battery

Dry cell battery

Silver oxide battery

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19.
In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?

To reduce evaporation of water from electrolyte

To exclude dirt and foreign matter from the electrolyte

To discharge both of the above functions

To discharge none of the above functions

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20.
Hydrogen evolved during charging produces explosive mixture when it is more than___________?

2%

4%

6%

8%

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21.
Which of the following primary cells has the highest voltage___________ ?

Manganese-alkaline

Carbon-zinc

Lithium

Mercury

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22.
For a cell to work, which of the following condition(s) become necessary ___________?

Two electrodes of different meta’s should be inserted in the electrolyte, not touching each other

Electrolyte must chemically react with one of the electrodes

Electrolyte liquid or paste should be conducting

All above three conditions are necessary

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23.
Charging a sulphated battery at high rate results in___________?

Boiling of electrolyte due to gassing

Warping of plates

Damage to separators, cell caps covers and battery case due to excessive temperature

All above

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24.
Extent of corrosion in the underground metal work depends upon___________?

Amount of moisture

Type of metals

Type of soil chemicals

All above factors

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25.
Mercury cell has which of the following characteristics ____________?

Flat discharge current-voltage curve

High power to weight ratio

Comparatively longer shelf life under adverse conditions of high temperature and humidity

All of the above

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26.
Which of the following primary cells has the lowest voltage_________ ?

Lithium

Zinc-chloride

Mercury

Carbon-zinc

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27.
Short circuiting of a cell may be caused____________?

Buckling of plates

Faulty separators

Lead particles forming circuit between positive and negative plates

Excessive accumulation of sediment

Any one of above

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30.
A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state

1.0

1.5

2.4

2.9

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