Q.1
Internal short circuits are caused by
Q.2
The storage battery generally used in electric power station is
Q.3
A dead storage battery can be revived by
Q.4
Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.
Q.5
Over charging
Q.6
If a battery is wrongly connected on charge following will happen
Q.7
A constant-voltage generator has
Q.8
The charge required to liberate one gram equivalent of any substance is known as ______ constant
Q.9
Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.
Q.10
Cells are connected in series in order to
Q.11
Which of the following is incorrect?
Q.12
Weston standard cell at 20°C has voltage of ____ volts.
Q.13
In constant voltage charging method, the charging current from discharged to fully charged condition
Q.14
In constant-current charging method, the supply voltage from discharged to fully charged condition
Q.15
In a lead-acid cell, lead is called as
Q.16
The common impurity in the electrolyte of lead-acid battery is
Q.17
A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.
Q.18
The substances which combine together to store electrical energy during the charge are called ______ materials
Q.19
If a lead-acid cell is discharged below 1.8 V the following will happen.
Q.20
Sulphated cells are indicated by
Q.21
The body of Edison cell is made of
Q.22
The active materials of a nickel-iron battery are
Q.23
Which of the following primary cells has the highest voltage ?
Q.24
Petroleum jelly is applied to the electrical connections to the lead-acid battery
Q.25
Following will occur if level of electrolyte falls below plates
Q.26
The capacity of a lead-acid cell does not depend on its
Q.27
Cells are connected in parallel to
Q.28
On the average the ampere-hour efficiency of an Edison cell is about
Q.29
The lead-acid cell should never be discharged beyond
Q.30
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
0 h : 0 m : 1 s