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Chemical Engineering :: Chemical Engineering Basics-2

  1. The preferred alloying element for low temperature applications of steel is

  2. A.

     Cr

    B.

     N

    C.

     Mo

    D.

     Ni


  3. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

  4. A.

     Grey

    B.

     Black

    C.

     Opaque

    D.

     White


  5. Percentage of gaunge is maximum in the ore of

  6. A.

     Iron

    B.

     Gold

    C.

     Zinc

    D.

     Copper


  7. Heat transfer by radiation from a hot body will be most rapid, if its surface is __________ because of its higher emissivity.

  8. A.

     White & rough

    B.

     Black & rough

    C.

     White & polished

    D.

     Black & polished


  9. A material is capable of resisting softening at high temperature, because of its property termed as

  10. A.

     Hot temper

    B.

     Hot hardness

    C.

     Fatigue

    D.

     Creep


  11. Austenite is not

  12. A.

     Ductile

    B.

     Malleable

    C.

     Magnetic

    D.

     Soft


  13. In the acid Bessemer process, the hot metal should have the following com-positon.

  14. A.

     S < 0.05% and P < 0.05%

    B.

     S < 0.05% and P < 1.5%

    C.

     S < 0.05% and P > 1.5%

    D.

     S > 1.5% and P < 0.05%


  15. During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to

  16. A.

     Time

    B.

     Square root of time

    C.

     Square of time

    D.

     Cube of time


  17. Brazing is the joining of metals

  18. A.

     Without melting the base metal

    B.

     With a non-ferrous filler

    C.

     Both A & B

    D.

     Neither A nor B


  19. When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is

  20. A.

     Cooled and dehumified

    B.

     Heated and humidified

    C.

     Cooled and humidified

    D.

     Heated and dehumidified