Electrolysis and Storage of Batteries MCQs | Electrolysis and Storage of Batteries Multiple Choice Questions and Answers

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Questions
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

Answer: Rate Of Charge
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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

Answer: 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

Answer: both (a) and (b)
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

Answer: 90 to 95%
9 When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance
A Milky
B Reddish
C Bright
D Dull

Answer: Milky
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

Answer: less than
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

Answer: both (a) and (b)
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

Answer: 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

Answer: 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

Answer: 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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