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Chemical Engineering :: Chemical Process

  1. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically

  2. A.

     Cyclo trimethylene trinitramine

    B.

     Trinitro resorcinol

    C.

     Cyclo tetramethylene tetranitramine

    D.

     Trinitro benzene


  3. Dechlorination of treated water is necessary to

  4. A.

     Remove residual turbidity

    B.

     Reduce the bacterial load on filter

    C.

     Control taste and odour

    D.

     Remove chlorinous taste


  5. Deaeration of water in its treatment is necessary, as it

  6. A.

     Minimises its turbidity

    B.

     Helps in controlling its taste and odour

    C.

     Minimises its corrosiveness

    D.

     None of these


  7. Phenol formaldehyde resin is used as an adhesive in making

  8. A.

     Laminates

    B.

     Card boxes

    C.

     Furniture

    D.

     Books


  9. Solvent used for extraction of oil is

  10. A.

     Hexane

    B.

     Methyl ethyl ketone

    C.

     Furfurol

    D.

     None of these


  11. Soap cannot be used with hard water, because

  12. A.

     Hard water contains sulphate

    B.

     They form insoluble calcium soaps which precipitate

    C.

     They attract back the removed dirt

    D.

     None of these


  13. Which glass is usually used in optical work?

  14. A.

     Lead glass

    B.

     High silica (borosilicate) glass

    C.

     Photo-sensitive glass

    D.

     Fibre glass


  15. The purpose of adding Na₂CO₃ to water of low alkalinity is to

  16. A.

     Permit the use of alum as a coagulant

    B.

     Increase the softening capacity of zeolite

    C.

     Facilitate easy regeneration of zeolite

    D.

     All of the above


  17. Calgon used in water treatment is chemically

  18. A.

     Sodium phosphate

    B.

     Sodium hexametaphosphate

    C.

     Calcium phosphate

    D.

     Tricresyl phosphate


  19. The main use of activated carbon in water treatment is to control

  20. A.

     Bacterial growth

    B.

     Taste and odour

    C.

     Turbidity

    D.

     None of these