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EEE :: Electrolysis and Storage of Batteries

  1. The capacity of a lead-acid cell does not depend on its

  2. A.

     temperature

    B.

     rate of charge

    C.

     rate of discharge

    D.

     quantity of active material


  3. During the charging and discharging of a nickel-iron cell

  4. A.

     corrosive fumes are produced

    B.

     water is neither formed nor absorbed

    C.

     nickel hydroxide remains unsplit

    D.

     its e.m.f. remains constant


  5. Excessive charging a battery tends to

  6. A.

     produce gassing

    B.

     increase the internal resistance of the battery

    C.

     to corrode the positive plates into lead peroxide thereby weakening them physically

    D.

     bring about all above changes


  7. _______ of electrolyte indicates the state of charge of the battery

  8. A.

     colour

    B.

     mass

    C.

     viscosity

    D.

     specific gravity


  9. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of

  10. A.

     reducing time of charging

    B.

     increasing cell capacity

    C.

     both (A) and (B)

    D.

     avoiding excessive gassing


  11. Which of the following primary cells has the highest voltage ?

  12. A.

     Manganese-alkaline

    B.

     Carbon-zinc

    C.

     Lithium

    D.

     Mercury


  13. Petroleum jelly is applied to the electrical connections to the lead-acid battery

  14. A.

     prevent local heating

    B.

     prevent short-circuiting

    C.

     reduce path resistance

    D.

     prevent corrosion


  15. Five 2 V cells are connected in parallel. The output voltage is

  16. A.

     1 V

    B.

     1.5 V

    C.

     1.75 V

    D.

     2 V


  17. Charging a sulphated battery at high rate results in

  18. A.

     boiling of electrolyte due to gassing

    B.

     warping of plates

    C.

     damage to separators, cell caps covers and battery case due to excessive temperature

    D.

     all above


  19. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into

  20. A.

     Pb02

    B.

     PbSC-4

    C.

     PbO

    D.

     Pb