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Electrical Engineering
Electrolysis And Storage Of Batteries
Quiz 1
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Q.1
The specific gravity of electrolyte is measured by
manometer
a mechanical gauge
hydrometer
psychrometer
Q.2
All the electrical connections between the battery and vehicle should be by
thin aluminium wires
thin copper wires
rigid cables
flexible cables
Q.3
Hydrogen evolved during charging produces explosive mixture when it is more than
2%
4%
6%
8%
Q.4
It is noticed that during discharging the following does not happen
both anode and cathode become PbS04
specific gravity of H?SO? decreases
voltage of the cell decreases
the cell absorbs energy
Q.5
The capacity of a battery is expressed in terms of
current rating
voltage rating
ampere-hour rating
none of the above
Q.6
The e.m.f. of an Edison cell, when fully charged, is nearly
1.4 V
1 V
0.9 V
0.8 V
Q.7
Capacity of a battery.is expressed in
Ah
Vh
Wh
kWh
Q.8
Which of the following primary cells has the lowest voltage ?
Lithium
Zinc-chloride
Mercury
Carbon-zinc
Q.9
A typical output of a solar cell is
0.1 V
0.26 V
1.1 V
2 V
Q.10
The output voltage of a charger is
less than the battery voltage
higher than the battery voltage
the same as the battery voltage
none of the above
Q.11
Self charge of a Ni-Fe cell is _____ Edison cell.
Equal to
Less than
More than
Much more than
Q.12
Excessive formation of lead sulphate on the surface of the plates happens because of
allowing a battery to stand in discharged condition for a long time
topping up with electrolyte
persistent undercharging
low level of electrolyte
all above
Q.13
In a lead-acid battery the energy is stored in the form of
charged ions
chemical energy
electrostatic energy
electromagnetic energy
Q.14
When a lead-acid battery is in fully charged condition, the color of its positive plate is
dark grey
brown
dark brown
none of above
Q.15
Undercharging
Reduces specific gravity of the electrolyte
Increases specific gravity of the electrolyte
Produces excessive gassing
Increases the temperature
Q.16
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
Q.17
Specific gravity of electrolyte in Edison cell is
0.8
0.95
1.1
1.21
Q.18
Local action in a battery is indicated by
excessive gassing under load conditions
excessive drop in the specific gravity of electrolyte even when the cell is on open circuit
both (A) and (B)
none of the above
Q.19
Life of the Edison cell is at least
five years
seven years
eight years
ten years
Q.20
Cell short circuit results in
low sp. gravity electrolyte
abnormal high temperature
reduced gassing on charge
all above
Q.21
“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”.
The above statement is associated with
Newton’s law
Faraday’s law of electromagnetic
Faraday’s law of electrolysis
Gauss’s law
Q.22
During discharge, the active material of both the positive and negative plates is changed to
Pb
Pb0
2
PbO
PbS0
4
Q.23
In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
one part H2O, three parts H₂SO₄
two parts H2O, two parts H₂SO₄
three parts H2O, one part H₂SO₄
all H₂SO₄
Q.24
Following will happen if the specific gravity of electrolyte becomes more than 1.23.
Loss of capacity
Loss of life
Corrosion of the grids of the plate
All above
Q.25
Battery container should be acid resistance, therefore it is made up of
glass
plastic
wood
all above
Q.26
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
Q.27
Under normal charging rate, the charging current should be
10% of capacity
20% of capacity
30% of capacity
40% of capacity
Q.28
When the load resistance equals the generator resistance which of the following will be maximum ?
Current
Efficiency of the circuit
Power in the load resistance
Voltage across the load resistance
Q.29
When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance
dull
reddish
bright
milky
Q.30
In ______ system the charging current is intermittently controlled at either a maximum or minimum value
two rate charge control
trickle charge
floating charge
an equalizing charge
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