A. positive active material
B. negative active material
C. passive material
D. none of the above
Related Mcqs:
- 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 - In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
A. one part H2O, three parts H2SO4
B. two parts H2O, two parts H2SO4
C. three parts H2O, one part H2SO4
D. all H2S04 - As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?
A. compactness
B. lower e.m.f.
C. small quantity of electrolyte used
D. higher internal resistance - The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell
A. two
B. three
C. four
D. five - When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in___________?
A. charged state
B. discharged state
C. both (A) and (B)
D. active state - The watt-hour efficiency of a lead-acid cell varies between________?
A. 25 to 35%
B. 40 to 60%
C. 70 to 80%
D. 90 to 95% - The capacity of a lead-acid cell depends on
A. rate of discharge
B. temperature
C. density of electrolyte
D. quantity of active materials
E. all above - As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?
A. reducing time of charging
B. increasing cell capacity
C. both (A) and (B)
D. avoiding excessive gassing - The lead-acid cell should never be discharged beyond____________?
A. 1.8 V
B. 1.9 V
C. 2 V
D. 2.1 V - If a lead-acid cell is discharged below 1.8 V the following will happen.____________?
A. Capacity of cell will reduce
B. Sulphation of plates will occur
C. Internal resistance will increase
D. All above will occur
