Electrolysis and Storage of Batteries MCQs | Electrolysis and Storage of Batteries Objective Type Questions and Answers

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Questions
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
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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

Answer: 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

Answer: 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

Answer: 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

Answer: 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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