Related Questions

In constant-current charging method, the supply voltage from discharged to fully charged condition
A decreases
B increases
C remains constant
D none of the 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
Under normal charging rate, the charging current should be
A 10% of capacity
B 20% of capacity
C 30% of capacity
D 40% of capacity
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by
A $$\frac{{\text{C}}}{{\text{R}}}$$
B $$\frac{{\text{1}}}{{{\text{RC}}}}$$
C $${\text{RC}}$$
D $$\frac{{\text{R}}}{{\text{C}}}$$
When a lead-acid battery is in fully charged condition, the color of its positive plate is
A dark grey
B brown
C dark brown
D none of above
Five time constants are required for a capacitor to charge fully or discharge fully.
A True
B False
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils
A Cause cholesterol build up and blood clotting
B Are prone to rancid oxidation
C Always contain some amount of nickel (as their complete removal is very difficult)
D Have affinity to retain harmful sulphur compounds
The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value,
A 37
B 42
C 63
D 73
The composition of the electrolyte in a fully charged battery is that
A The electrolyte is pure distilled water
B The electrolyte is pure sulphuric acid
C The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
D The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The active materials on the positive and negative plates of a fully charged lead-acid battery are
A lead and lead peroxide
B lead sulphate and lead
C lead peroxide and lead
D none of the above

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