MCQ's on Batteries

1. Active materials of a lead-acid cell are:
   (a) lead peroxide
   (b) sponge lead
   (c) dilute sulphuric acid
   (d) all of the above

2. During the charging of a lead-acid cell:
   (a) its cathode becomes dark chocolate brown in colour
   (b) its voltage increases
   (c) it gives out energy
   (d) specific gravity of H2SO4 is decreased

3. The ratio of Ah efficiency to Wh efficiency of a lead-acid cell is:
    (a) always less than one
    (b) just one
    (c) always greater than one
    (d) either (a) or (b)

4. The capacity of a lead acid cell is measured in:
    (a) watt-hours
    (b) watts
    (c) amperes
    (d) ampere-hours

5. The capacity of a lead-acid cell does not depend on its:
    (a) rate of charge
    (b) rate of discharge
    (c) temperature
    (d) quantity of active material

6. As compared to constant-current system, the constant-voltage          system of charging a lead-acid cell has the advantage of:
   (a) avoiding excessive gassing
   (b) reducing time of charging
   (c) increasing cell capacity
   (d) both (b) and (c)

7. Sulphation in a lead-acid battery occurs due to:
    (a) trickle charging
    (b) incomplete charging
    (c) heavy discharging
    (d) fast charging

8. The active materials of a nickel-iron battery are
    (a) nickel hydrooxide
    (b) powdered iron and its oxides
    (c) 21% solution of caustic potash
    (d) all of the above