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Electrical Engineering
Electrolysis And Storage Of Batteries
Quiz 3
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Q.1
Capacity of dry cells is
more when it is supplying current for intermittent periods
more when it is supplying current for continuous periods
unaffected by the type of discharge
none of the above
Q.2
As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its
compactness
lower e.m.f.
small quantity of electrolyte used
higher internal resistance
Q.3
Dry cell is modification of
Deniell cell
Leclanche cell
Lead-acid cell
Edison cell
Q.4
Five 2 V cells are connected in parallel. The output voltage is
1 V
1.5 V
1.75 V
2 V
Q.5
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
Q.6
During the idle period of the battery, strong electrolyte tends to change the active material of the cell into
Pb02
PbSC-4
PbO
Pb
Q.7
In order that a hydrometer may float vertically in electrolyte its C.G. should be
lowered
raised
undisturbed
displaced sideways
Q.8
Which of the following factors adversely affects the capacity of the leadacid battery ?
Temperature of surroundings
Specific gravity of electrolyte
Rate of discharge
All of the above
Q.9
During the charging and discharging of a nickel-iron cell
corrosive fumes are produced
water is neither formed nor absorbed
nickel hydroxide remains unsplit
its e.m.f. remains constant
Q.10
Excessive charging a battery tends to
produce gassing
increase the internal resistance of the battery
to corrode the positive plates into lead peroxide thereby weakening them physically
bring about all above changes
Q.11
_______ of electrolyte indicates the state of charge of the battery
colour
mass
viscosity
specific gravity
Q.12
On overcharging a battery
It will bring about chemical change in active materials
It will increase the capacity of the battery
It will raise the specific gravity of the electrolyte
None of the above will occur
Q.13
Batteries are charged by
rectifiers
engine generator sets
motor generator sets
any one of the above methods
Q.14
The active material of the positive plates of silver-zinc batteries is
silver oxide
lead oxide
lead
zinc powder
Q.15
Persons preparing electrolyte should wear
goggles or other face shield
rubber
rubber boots and gloves
all above safety devices
Q.16
48 ampere-hour capacity would deliver a current of
48 amperes for 1 hour
24 amperes for 2 hours
8 amperes for 6 hours
6 amperes for 8 hours
Q.17
Electrolyte used in an Edison cell is
NaOH
kOH
HC1
HN03
Q.18
Life of the batteries is in the following ascending order.
Lead-acid cell, Edison cell, Nickel cadmium cell
Lead-acid cell, Nickel-cadmium cell, Edison cell
Edison cell, Nickel-cadmium cell, lead-acid cell
Nickel-cadmium cell, Edison cell, lead-acid cell
Q.19
In alkaline cell the electrolyte is
dilute sulphuric acid
concentrated sulphuric acid
NaOH
kOH
Q.20
The current flow through electrolyte is due to the movement of
ions
holes
electrons
none of the above
Q.21
The active materials on the positive and negative plates of a fully charged lead-acid battery are
lead and lead peroxide
lead sulphate and lead
lead peroxide and lead
none of the above
Q.22
As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
reducing time of charging
increasing cell capacity
both (A) and (B)
avoiding excessive gassing
Q.23
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
Q.24
Following will happen if battery charging rate is too high
excessive gassing will occur
temperature rise will occur
bulging and buckling of plates will occur
all above will occur
Q.25
Extent of corrosion in the underground metal work depends upon
amount of moisture
type of metals
type of soil chemicals
all above factors
Q.26
The average charging voltage for alkali cell is about
1 V
1.2 V
1.7 V
2.1 V
Q.27
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
Q.28
It is noticed that durum charging
there is a rise in voltage
energy is absorbed by the cell
specific gravity of H₂SO₄ is increased
the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)
all of the above
Q.29
The internal resistance of a lead-acid cell is that of Edison cell
Less than
More than
Equal to
None of the above
Q.30
Satellite power requirement is provided through
solar cells
dry cells
nickel-cadmium cells
lead-acid batteries
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