In constant-current charging method, the supply voltage from discharged to fully charged condition

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

In constant-current charging method, the supply voltage from discharged to fully charged condition

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