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EEE :: Electrolysis and Storage of Batteries

  1. Following will happen if the specific gravity of electrolyte becomes more than 1.23.

  2. A.

     Loss of capacity

    B.

     Loss of life

    C.

     Corrosion of the grids of the plate

    D.

     All above

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  3. Battery container should be acid resistance, therefore it is made up of

  4. A.

     glass

    B.

     plastic

    C.

     wood

    D.

     all above

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  5. When two batteries are connected in parallel, it should be ensured that

  6. A.

     they have same e.m.f.

    B.

     they have same make

    C.

     they have same ampere-hour capacity

    D.

     they have identical internal resistance

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  7. Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.

  8. A.

     8

    B.

     12

    C.

     16

    D.

     24

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  9. Over charging

  10. A.

     produces excessive gassing

    B.

     loosens the active material

    C.

     increases the temperature resulting in buckling of plates

    D.

     all above

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  11. During discharge, the active material of both the positive and negative plates is changed to

  12. A.

     Pb

    B.

     Pb02

    C.

     PbO

    D.

     PbS04

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  13. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following

  14. A.

     one part H2O, three parts H₂SO₄

    B.

     two parts H2O, two parts H₂SO₄

    C.

     three parts H2O, one part H₂SO₄

    D.

     all H₂SO₄

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  15. Internal short circuits are caused by

  16. A.

     breakdown of one or more separators

    B.

     excess accumulation of sediment at the bottom of the cell

    C.

     both (A) and (B)

    D.

     none of the above

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  17. The storage battery generally used in electric power station is

  18. A.

     nickel-cadmium battery

    B.

     zinc-carbon battery

    C.

     lead-acid battery

    D.

     none of the above

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  19. A dead storage battery can be revived by

  20. A.

     adding distilled water

    B.

     adding so-called battery restorer

    C.

     a dose of H₂SO₄

    D.

     none of the above

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