Related Questions

In constant voltage charging method, the charging current from discharged to fully charged condition
A decreases
B increases
C remains constant
D none of the above
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
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
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?
A Mechanical rectifiers
B Copper oxide rectifiers
C Selenium rectifiers
D Electrolytic rectifiers
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 $$\frac{{\text{R}}}{{\text{C}}}$$
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 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
When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance
A dull
B reddish
C bright
D milky

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