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EEE :: Electrolysis and Storage of Batteries

  1. In a lead-acid cell, lead is called as

  2. A.

     positive active material

    B.

     negative active material

    C.

     passive material

    D.

     none of the above


  3. The common impurity in the electrolyte of lead-acid battery is

  4. A.

     chlorine

    B.

     dust particles

    C.

     lead crystals

    D.

     iron


  5. The substances which combine together to store electrical energy during the charge are called ______ materials

  6. A.

     active

    B.

     passive

    C.

     inert

    D.

     dielectric


  7. If a lead-acid cell is discharged below 1.8 V the following will happen.

  8. A.

     Capacity of cell will reduce

    B.

     Sulphation of plates will occur

    C.

     Internal resistance will increase

    D.

     All above will occur


  9. Sulphated cells are indicated by

  10. A.

     the loss of capacity of the cell

    B.

     the decrease of the specific gravity

    C.

     the low voltage of the cell on discharge

    D.

     all above conditions


  11. Which of the following is incorrect?

  12. A.

     A storage cell has a reversible chemical reaction

    B.

     A lead-acid cell can be recharged

    C.

     A carbon-zinc cell has unlimited shelf life

    D.

     A primary cell has an irreversible chemical reaction


  13. Weston standard cell at 20°C has voltage of ____ volts.

  14. A.

     0.8

    B.

     0.9

    C.

     1.0187

    D.

     1.5


  15. In constant voltage charging method, the charging current from discharged to fully charged condition

  16. A.

     decreases

    B.

     increases

    C.

     remains constant

    D.

     none of the above


  17. In constant-current charging method, the supply voltage from discharged to fully charged condition

  18. A.

     decreases

    B.

     increases

    C.

     remains constant

    D.

     none of the above


  19. A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.

  20. A.

     1.0

    B.

     1.5

    C.

     2.4

    D.

     2.9