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

Question: The output voltage of a charger is__________?

• 1. less than the battery voltage
• 2. higher than the battery voltage
• 3. the same as the battery voltage
• 4. none of the above

Question: The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is____________?

• 1. just one
• 2. always greater than one
• 3. always less than one
• 4. none of the above

Question: The storage battery generally used in electric power station is__________?

• 1. nickel-cadmium battery
• 2. zinc-carbon battery
• 3. lead-acid battery
• 4. none of the above

Question: During the charging of a lead-acid cell__________?

• 1. its voltage increases
• 2. it gives out energy
• 3. its cathode becomes dark chocolate brown in colour
• 4. specific gravity of H2SO4 decreases

Question: The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?

• 1. lead and lead peroxide
• 2. lead sulphate and lead
• 3. lead peroxide and lead
• 4. none of the above