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EEE :: Electrolysis and Storage of Batteries

  1. When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in

  2. A.

     charged state

    B.

     discharged state

    C.

     both (A) and (B)

    D.

     active state


  3. During charging the specific gravity of the electrolyte of a lead-acid battery

  4. A.

     increases

    B.

     decreases

    C.

     remains the same

    D.

     becomes zero


  5. While preparing electrolyte for a lead-acid battery

  6. A.

     water is poured into acid

    B.

     acid is poured into water

    C.

     anyone of the two can be added to other chemical

    D.

     none of the above


  7. The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is

  8. A.

     just one

    B.

     always greater than one

    C.

     always less than one

    D.

     none of the above


  9. Electrolyte used in a lead-acid cell is

  10. A.

     NaOH

    B.

     only H₂SO₄

    C.

     only water

    D.

     dilute H₂SO₄


  11. Shelf life of a small dry cell is

  12. A.

     equal to that of large dry cell

    B.

     less than that of large dry cell

    C.

     more than that of large dry cell

    D.

     none of the above


  13. The best indication about the state of charge on a lead-acid battery is given by

  14. A.

     output voltage

    B.

     temperature of electrolyte

    C.

     specific gravity of electrolyte

    D.

     none of the above


  15. Each cell has a vent cap

  16. A.

     to allow gases out when the cell is on charge

    B.

     to add water to the cell if needed

    C.

     to check the level of electrolyte

    D.

     to do all above functions


  17. The capacity of a lead-acid cell is measured in

  18. A.

     amperes

    B.

     ampere-hours

    C.

     watts

    D.

     watt-hours


  19. The watt-hour efficiency of a lead-acid cell varies between

  20. A.

     25 to 35%

    B.

     40 to 60%

    C.

     70 to 80%

    D.

     90 to 95%