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Electrical Engineering
Electrolysis And Storage Of Batteries
Quiz 2
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Q.1
Internal short circuits are caused by
breakdown of one or more separators
excess accumulation of sediment at the bottom of the cell
both (A) and (B)
none of the above
Q.2
The storage battery generally used in electric power station is
nickel-cadmium battery
zinc-carbon battery
lead-acid battery
none of the above
Q.3
A dead storage battery can be revived by
adding distilled water
adding so-called battery restorer
a dose of H₂SO₄
none of the above
Q.4
Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.
8
12
16
24
Q.5
Over charging
produces excessive gassing
loosens the active material
increases the temperature resulting in buckling of plates
all above
Q.6
If a battery is wrongly connected on charge following will happen
current delivered by the battery will be high
current drawing will be nil
current drawing will be very small
current drawing will be very high
Q.7
A constant-voltage generator has
minimum efficiency
minimum current capacity
low internal resistance
high internal resistance
Q.8
The charge required to liberate one gram equivalent of any substance is known as ______ constant
Time
Faraday’s
Boltzman
none of the above
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.
passive
active
redundant
inert
Q.10
Cells are connected in series in order to
increase the voltage rating
increase the current rating
increase the life of the cells
none of the above
Q.11
Which of the following is incorrect?
A storage cell has a reversible chemical reaction
A lead-acid cell can be recharged
A carbon-zinc cell has unlimited shelf life
A primary cell has an irreversible chemical reaction
Q.12
Weston standard cell at 20°C has voltage of ____ volts.
0.8
0.9
1.0187
1.5
Q.13
In constant voltage charging method, the charging current from discharged to fully charged condition
decreases
increases
remains constant
none of the above
Q.14
In constant-current charging method, the supply voltage from discharged to fully charged condition
decreases
increases
remains constant
none of the above
Q.15
In a lead-acid cell, lead is called as
positive active material
negative active material
passive material
none of the above
Q.16
The common impurity in the electrolyte of lead-acid battery is
chlorine
dust particles
lead crystals
iron
Q.17
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
Q.18
The substances which combine together to store electrical energy during the charge are called ______ materials
active
passive
inert
dielectric
Q.19
If a lead-acid cell is discharged below 1.8 V the following will happen.
Capacity of cell will reduce
Sulphation of plates will occur
Internal resistance will increase
All above will occur
Q.20
Sulphated cells are indicated by
the loss of capacity of the cell
the decrease of the specific gravity
the low voltage of the cell on discharge
all above conditions
Q.21
The body of Edison cell is made of
bakelite
rubber
nickel plated steel
aluminium
Q.22
The active materials of a nickel-iron battery are
nickel hydroxide
powdered iron and its oxide
21% solution of kOH
all of the above
Q.23
Which of the following primary cells has the highest voltage ?
Manganese-alkaline
Carbon-zinc
Lithium
Mercury
Q.24
Petroleum jelly is applied to the electrical connections to the lead-acid battery
prevent local heating
prevent short-circuiting
reduce path resistance
prevent corrosion
Q.25
Following will occur if level of electrolyte falls below plates
capacity of the cell is reduced
life of the cell is reduced
open plates are converted to lead sulphate
all above
Q.26
The capacity of a lead-acid cell does not depend on its
temperature
rate of charge
rate of discharge
quantity of active material
Q.27
Cells are connected in parallel to
Increase the efficiency
Increase the current capacity
Increase the voltage output
Increase the internal resistance
Q.28
On the average the ampere-hour efficiency of an Edison cell is about
40%
60%
70%
80%
Q.29
The lead-acid cell should never be discharged beyond
1.8 V
1.9 V
2 V
2.1 V
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
6 parts of acid to 4 parts of water
4 parts of acid to 4 parts of water
4 parts of acid to 6 parts of water
4 parts of acid to 8 parts of water
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