Question: As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?

• 1. compactness
• 2. lower e.m.f.
• 3. small quantity of electrolyte used
• 4. higher internal resistance

Question: In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?

• 1. one part H2O, three parts H2SO4
• 2. two parts H2O, two parts H2SO4
• 3. three parts H2O, one part H2SO4
• 4. all H2S04

Question: Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials:

• 1. passive
• 2. active
• 3. redundant
• 4. inert

Question: During the charging and discharging of a nickel-iron cell____________?

• 1. corrosive fumes are produced
• 2. water is neither formed nor absorbed
• 3. nickel hydroxide remains unsplit
• 4. its e.m.f. remains constant

Question: A dead storage battery can be revived by___________?

• 1. adding distilled water
• 2. adding so-called battery restorer
• 3. a dose of H2SO4
• 4. none of the above

Question: Five 2 V cells are connected in parallel. The output voltage is__________?

• 1. 1 V
• 2. 1.5 V
• 3. 1.75 V
• 4. 2 V

Question: As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?

• 1. reducing time of charging
• 2. increasing cell capacity
• 3. both (A) and (B)
• 4. avoiding excessive gassing

Question: The capacity of a battery is expressed in terms of____________?

• 1. current rating
• 2. voltage rating
• 3. ampere-hour rating
• 4. none of the above

Question: Cells are connected in series in order to_____________?

• 1. increase the voltage rating
• 2. increase the current rating
• 3. increase the life of the cells
• 4. none of the above

Question: The best indication about the state of charge on a lead-acid battery is given by____________?

• 1. output voltage
• 2. temperature of electrolyte
• 3. specific gravity of electrolyte
• 4. none of the above