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Free download in PDF Electrolysis and Storage of Batteries Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
During the charging of a lead-acid cell
[A]
it gives out energy
[B]
its cathode becomes dark chocolate brown in colour
[C]
specific gravity of H2SO4 decreases
[D]
its voltage increases
Answer: its voltage increases
(2)
The capacity of a lead-acid cell does not depend on its
[A]
Rate Of Charge
[B]
Quantity Of Active Material
[C]
Temperature
[D]
Rate Of Discharge
(3)
The active materials on the positive and negative plates of a fully charged lead-acid battery are
[A]
lead peroxide and lead
[B]
lead sulphate and lead
[C]
lead and lead peroxide
[D]
none of the above
Answer: lead peroxide and lead
(4)
The active materials of a nickel-iron battery are
[A]
21% solution of KOH
[B]
powdered iron and its oxide
[C]
nickel hydroxide
[D]
all of the above
(5)
The output voltage of a charger is
[A]
higher than the battery voltage
[B]
the same as the battery voltage
[C]
less than the battery voltage
[D]
none of the above
Answer: higher than the battery voltage
(6)
As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
[A]
increasing cell capacity
[B]
reducing time of charging
[C]
both (a) and (b)
[D]
avoiding excessive gassing
(7)
In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
[A]
three parts H2O, one part H2SO4
[B]
one part H2O, three parts H2SO4
[C]
two parts H2O, two parts H2SO4
[D]
all H2S04
Answer: three parts H2O, one part H2SO4
(8)
The ampere-hour efficiency of a leadacid cell is normally between
[A]
90 to 95%
[B]
20 to 30%
[C]
40 to 50%
[D]
None of these
(9)
When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance
[A]
Milky
[B]
Reddish
[C]
Bright
[D]
Dull
(10)
The internal resistance of a lead-acid cell is that of Edison cell
[A]
less than
[B]
more than
[C]
Does not contain any sample point
[D]
none of the above
(11)
Undercharging
[A]
produces excessive gassing
[B]
increases specific gravity of the electrolyte
[C]
reduces specific gravity of the electrolyte
[D]
increases the temperature
Answer: reduces specific gravity of the electrolyte
(12)
Internal short circuits are caused by
[A]
excess accumulation of sediment at the bottom of the cell
[B]
breakdown of one or more separators
[C]
both (a) and (b)
[D]
none of the above
(13)
Excessive formation of lead sulphate on the surface of the plates happens because of
[A]
persistent undercharging
[B]
topping up with electrolyte
[C]
allowing a battery to stand in discharged condition for a long time
[D]
all above
(14)
In a lead-acid cell, lead is called as
[A]
negative active material
[B]
passive material
[C]
positive active material
[D]
none of the above
Answer: negative active material
(15)
On overcharging a battery
[A]
it will raise the specific gravity of the electrolyte
[B]
it will increase the capacity of the battery
[C]
it will bring about chemical change in active materials
[D]
none of the above will occur
Answer: none of the above will occur
(16)
Following will occur if level of electrolyte falls below plates
[A]
open plates are converted to lead sulphate
[B]
capacity of the cell is reduced
[C]
life of the cell is reduced
[D]
all above
(17)
48 ampere-hour capacity would deliver a current of
[A]
6 amperes for 8 hours
[B]
48 amperes for 1 hour
[C]
24 amperes for 2 hours
[D]
8 amperes for 6 hours
Answer: 6 amperes for 8 hours
(18)
Battery charging equipment is generally installed
[A]
in location having all above features
[B]
in clean and dry place
[C]
as near as practical to the battery being charged
[D]
in well ventilated location
Answer: in location having all above features
(19)
Following will happen if the specific gravity of electrolyte becomes more than 1.23.
[A]
Corrosion of the grids of the plate
[B]
Loss of capacity
[C]
Loss of life
[D]
All above
(20)
Internal resistance of a cell is reduced by
[A]
putting plates very close together
[B]
using vent plug to permit gas formed during discharge
[C]
increasing the plate area
[D]
all above methods
Answer: all above methods
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