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Free download in PDF Electrolysis and Storage of Batteries Objective Type 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.
(21)
Capacity of dry cells is
[A]
unaffected by the type of discharge
[B]
more when it is supplying current for continuous periods
[C]
more when it is supplying current for intermittent periods
[D]
none of the above
Answer: more when it is supplying current for intermittent periods
(22)
Sulphated cells are indicated by
[A]
the low voltage of the cell on discharge
[B]
the decrease of the specific gravity
[C]
the loss of capacity of the cell
[D]
all above conditions
Answer: all above conditions
(23)
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
[A]
4 parts of acid to 6 parts of water
[B]
4 parts of acid to 4 parts of water
[C]
6 parts of acid to 4 parts of water
[D]
none of the above
Answer: 4 parts of acid to 6 parts of water
(24)
Local action in a battery is indicated by
[A]
excessive drop in the specific gravity of electrolyte even when the cell is on open circuit
[B]
excessive gassing under load conditions
[C]
both (a) and (b)
[D]
none of the above
Answer: none of the above
(25)
Following will happen if battery charging rate is too high
[A]
excessive gassing will occur
[B]
temperature rise will occur
[C]
bulging and buckling of plates will occur
[D]
all above will occur
Answer: all above will occur
(26)
Internal resistance of a cell is due to
[A]
surface contact resistance between electrode and electrolyte
[B]
electrode resistance
[C]
resistance of electrolyte
[D]
all above
(27)
If a battery is wrongly connected on charge following will happen
[A]
current drawing will be very high
[B]
current drawing will be nil
[C]
current delivered by the battery will be high
[D]
current drawing will be very small
Answer: current drawing will be very high
(28)
If a lead-acid cell is discharged below 1.8 V the following will happen.
[A]
Internal resistance will increase
[B]
Sulphation of plates will occur
[C]
Capacity of cell will reduce
[D]
All above will occur
Answer: All above will occur
(29)
Life of the batteries is in the following ascending order.
[A]
Lead-acid cell, Edison cell, Nickel cadmium cell
[B]
Nickel-cadmium cell, Edison cell, lead-acid cell
[C]
Lead-acid cell, Nickel-cadmium cell, Edison cell
[D]
Edison cell, Nickel-cadmium cell, lead-acid cell
Answer: Lead-acid cell, Edison cell, Nickel cadmium cell
(30)
Shelf life of a small dry cell is
[A]
less than that of large dry cell
[B]
more than that of large dry cell
[C]
equal to that of large dry cell
[D]
none of the above
Answer: less than that of large dry cell
31
Extent of corrosion in the underground metal work depends upon
[A]
type of soil chemicals
[B]
amount of moisture
[C]
type of metals
[D]
all above factors
Answer: all above factors
32
Mercury cell has which of the following characteristics ?
[A]
Comparatively longer shelf life under adverse conditions of high temperature and humidity
[B]
High power to weight ratio
[C]
Flat discharge current-voltage curve
[D]
All of the above
33
Charging a sulphated battery at high rate results in
[A]
damage to separators, cell caps covers and battery case due to excessive temperature
[B]
warping of plates
[C]
boiling of electrolyte due to gassing
[D]
all above
34
In a battery cover is placed over the element and sealed to the top of the battery container. This is done
[A]
to discharge both of the above functions
[B]
to discharge none of the above functions
[C]
to reduce evaporation of water from electrolyte
[D]
to exclude dirt and foreign matter from the electrolyte
Answer: to discharge both of the above functions
35
For a cell to work, which of the following condition(s) become necessary ?
[A]
Electrolyte liquid or paste should be conducting
[B]
Electrolyte must chemically react with one of the electrodes
[C]
Two electrodes of different meta’s should be inserted in the electrolyte, not touching each other
[D]
All above three conditions are necessary
Answer: All above three conditions are necessary
36
Which of the following battery is used for air-craft ?
[A]
Nickel-iron battery
[B]
Dry cell battery
[C]
Silver oxide battery
[D]
Lead-acid battery
Answer: Nickel-iron battery
37
Which of the following is incorrect ?
[A]
A carbon-zinc cell has unlimited shelf life
[B]
A lead-acid cell can be recharged
[C]
A primary cell has an irreversible chemical reaction
[D]
A storage cell has a reversible chemical reaction
Answer: A carbon-zinc cell has unlimited shelf life
38
Under normal charging rate, the charging current should be
[A]
40% of capacity
[B]
20% of capacity
[C]
30% of capacity
[D]
10% of capacity
39
When two batteries are connected in parallel, it should be ensured that
[A]
they have identical internal resistance
[B]
they have same make
[C]
they have same ampere-hour capacity
[D]
they have same e.m.f.
Answer: they have same e.m.f.
40
Petroleum jelly is applied to the electrical connections to the lead-acid battery
[A]
prevent corrosion
[B]
prevent short-circuiting
[C]
prevent local heating
[D]
reduce path resistance
Answer: prevent corrosion
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