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Electrical Engineering
Electrolysis And Storage Of Batteries
Quiz 4
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Q.1
Which of the following has lower sp. gravity V
Dilute H₂SO₄
Concentrated H₂SO₄
Water
Any of the above
Q.2
Which of the following cell has a reversible chemical reaction ?
Lead-acid
Mercury oxide
Carbon-zinc
Silver-oxide
Q.3
The open circuit voltage of any storage cell depends wholly upon
its chemical constituents
on the strength of its electrolyte
its temperature
all above
Q.4
Shelf life of a small dry cell is
equal to that of large dry cell
less than that of large dry cell
more than that of large dry cell
none of the above
Q.5
When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in
charged state
discharged state
both (A) and (B)
active state
Q.6
During charging the specific gravity of the electrolyte of a lead-acid battery
increases
decreases
remains the same
becomes zero
Q.7
Negative plate of an Edison cell is made of
copper
lead
iron
silver oxide
Q.8
Lead-acid cell has a life of nearly charges and discharges
500
700
1000
1250
Q.9
The following indicate that battery on charge has attained full charge
colour of electrode
gassing
specific gravity
all above
Q.10
Internal resistance of a cell is reduced by
using vent plug to permit gas formed during discharge
increasing the plate area
putting plates very close together
all above methods
Q.11
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
Q.12
The capacity of a lead-acid cell depends on
Rate of discharge
Temperature
Density of electrolyte
All above
Q.13
The internal resistance of an alkali cell is nearly _____ times that of the lead-acid cell.
two
three
four
five
Q.14
Level of electrolyte in a cell should be _____ the level of plates
below
equal to
above
none of the above
Q.15
Internal resistance of a cell is due to
resistance of electrolyte
electrode resistance
surface contact resistance between electrode and electrolyte
all above
Q.16
During the charging of a lead-acid cell
its voltage increases
it gives out energy
its cathode becomes dark chocolate brown in colour
specific gravity of H₂SO₄ decreases
Q.17
Battery charging equipment is generally installed
In well ventilated location
In clean and dry place
As near as practical to the battery being charged
In location having all above features
Q.18
The effect of sulphation is that the internal resistance
increases
decreases
remains same
none of the above
Q.19
The best indication about the state of charge on a lead-acid battery is given by
output voltage
temperature of electrolyte
specific gravity of electrolyte
none of the above
Q.20
Each cell has a vent cap
to allow gases out when the cell is on charge
to add water to the cell if needed
to check the level of electrolyte
to do all above functions
Q.21
While preparing electrolyte for a lead-acid battery
water is poured into acid
acid is poured into water
anyone of the two can be added to other chemical
none of the above
Q.22
The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
just one
always greater than one
always less than one
none of the above
Q.23
Which among the following constitutes the major load for an automobile battery ?
Brake light
Self starter
Parking lights
Spark plugs
Q.24
Trickle charging of a storage battery helps to
maintain proper electrolyte level
increase its reserve capacity
prevent sulphation
keep it fresh and fully charged
Q.25
Which of the following battery is used for aircraft ?
Lead-acid battery
Nickel-iron battery
Dry cell battery
Silver oxide battery
Q.26
Chargmg of sulphated battery produces ____ heat.
no
very little
less
more
Q.27
The ampere-hour efficiency of a leadacid cell is normally between
20 to 30%
40 to 50%
60 to 70%
90 to 95%
Q.28
The capacity of a lead-acid cell is measured in
amperes
ampere-hours
watts
watt-hours
Q.29
The watt-hour efficiency of a lead-acid cell varies between
25 to 35%
40 to 60%
70 to 80%
90 to 95%
Q.30
Electrolyte used in a lead-acid cell is
NaOH
only H₂SO₄
only water
dilute H₂SO₄
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