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Chemical Engineering :: Chemical Engineering Basics-2

  1. Factor of safety is the ratio of the __________ stress to the working stress.

  2. A.

     Tensile

    B.

     Compressive

    C.

     Yield

    D.

     Bearing

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  3. Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

  4. A.

     Achieve very high purity of aluminium (99.9%)

    B.

     Keep the electrolyte in liquid condition by the generation of heat

    C.

     Electrolytically dissociate alumina

    D.

     Both(b) & (c)

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  5. In radiative heat transfer, a grey surface is the one, which has

  6. A.

     Emissivity independent of wavelength

    B.

     Grey appearance to the eye

    C.

     Zero reflectivity

    D.

     Equal brightness in all directions

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  7. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

  8. A.

     T

    B.

     1/T

    C.

     T²

    D.

     1/

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  9. Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.

  10. A.

     597

    B.

     959

    C.

     1147

    D.

     1493

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  11. Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

  12. A.

     723

    B.

     959

    C.

     1147

    D.

     1493

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  13. High speed steel tools retain their hardness upto a temperature of __________ °C.

  14. A.

     500

    B.

     750

    C.

     900

    D.

     1100

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  15. Super conduction in metals is observed at a temperature of __________ °K.

  16. A.

     <100

    B.

     >100

    C.

     About 273

    D.

     About 373

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  17. Rain drops falling through atmospheric air attain limited terminal velocity, because of

  18. A.

     Upward thrust due to air

    B.

     Viscous force exerted by air

    C.

     Surface tension effects of water

    D.

     Force of gravity

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  19. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

  20. A.

     Is as light as possible

    B.

     Has very high C.O.P

    C.

     Employs minimum quantity of refrigerant

    D.

     Consumer minimum horse power

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