It is noticed that durum charging
A. There is a rise in voltage
B. Energy is absorbed by the cell
C. Specific gravity of H2 SO4 is increased
D. The anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)
E. All of the above
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The internal resistance of a lead-acid cell is that of Edison cell
A. Less than
B. More than
C. Equal to
D. None of the above
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The internal resistance of an alkali cell is nearly _____ times that of the lead-acid cell.
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Level of electrolyte in a cell should be _____ the level of plates
A. below
B. equal to
C. above
D. none of the above
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Which of the following battery is used for aircraft ?
A. Lead-acid battery
B. Nickel-iron battery
C. Dry cell battery
D. Silver oxide battery
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For a cell to work, which of the following condition(s) become necessary ?
A. Two electrodes of different meta’s should be inserted in the electrolyte, not touching each other
B. Electrolyte must chemically react with one of the electrodes
C. Electrolyte liquid or paste should be conducting
D. All above three conditions are necessary
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Internal resistance of a cell is reduced by
A. using vent plug to permit gas formed during discharge
B. increasing the plate area
C. putting plates very close together
D. all above methods
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Short circuiting of a cell may be caused
A. buckling of plates
B. faulty separators
C. lead particles forming circuit between positive and negative plates
D. excessive accumulation of sediment
E. any one of above
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The capacity of a lead-acid cell depends on
A. Rate of discharge
B. Temperature
C. Density of electrolyte
D. All above
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Trickle charging of a storage battery helps to
A. maintain proper electrolyte level
B. increase its reserve capacity
C. prevent sulphation
D. keep it fresh and fully charged
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Extent of corrosion in the underground metal work depends upon
A. amount of moisture
B. type of metals
C. type of soil chemicals
D. all above factors
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The average charging voltage for alkali cell is about
A. 1 V
B. 1.2 V
C. 1.7 V
D. 2.1 V
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Lead-acid cell has a life of nearly charges and discharges
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The following indicate that battery on charge has attained full charge
A. colour of electrode
B. gassing
C. specific gravity
D. all above
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Which among the following constitutes the major load for an automobile battery ?
A. Brake light
B. Self starter
C. Parking lights
D. Spark plugs
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The lead-acid cell should never be discharged beyond
A. 1.8 V
B. 1.9 V
C. 2 V
D. 2.1 V
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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. 6 parts of acid to 4 parts of water
B. 4 parts of acid to 4 parts of water
C. 4 parts of acid to 6 parts of water
D. 4 parts of acid to 8 parts of water
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Capacity of dry cells is
A. more when it is supplying current for intermittent periods
B. more when it is supplying current for continuous periods
C. unaffected by the type of discharge
D. none of the above
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Persons preparing electrolyte should wear
A. goggles or other face shield
B. rubber
C. rubber boots and gloves
D. all above safety devices
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48 ampere-hour capacity would deliver a current of
A. 48 amperes for 1 hour
B. 24 amperes for 2 hours
C. 8 amperes for 6 hours
D. 6 amperes for 8 hours
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