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Chemical Engineering :: Heat Transfer

  1. A perfect black body is a perfect __________ of radiation.

  2. A.
    absorber
    B.
    emitter
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  3. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

  4. A.
    equal to
    B.
    more than
    C.
    less than
    D.
    either more or less than (depending upon the fluid)

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  5. An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

  6. A.
    boiler
    B.
    heat exchanger
    C.
    recuperator
    D.
    regenerator

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  7. Which of the following is directly concerned with the heat transfer ?

  8. A.
    Strouhal number
    B.
    Sherwood number
    C.
    Euler number
    D.
    Grashoff number

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  9. Pick out the wrong statement:

  10. A.
    With change in temperature, the radiant energy emitted by a black body remains unchanged.
    B.
    Absorptivity of a body approaches unity in case of diffuse reflection.
    C.
    Absorptivity of a perfectly black body is unity.
    D.
    Value of Stefan-Boltzman constant is 4.876 x 10-8 KCal/m2.hr.°K4.

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  11. Planck's distribution law is valid for __________ bodies.

  12. A.
    black
    B.
    white
    C.
    coloured
    D.
    all (a), (b) & (c)

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  13. For hot feed, forward feeding as compared to backward feeding results in __________ economy.

  14. A.
    increased
    B.
    decreased
    C.
    no effect on
    D.
    none of these

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  15. Radiation energy is emitted by all the substances, which are above

  16. A.
    0°K
    B.
    0°C
    C.
    100°C
    D.
    room temperature

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  17. The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

  18. A.
    εx + εy
    B.
    εx . εy
    C.
    D.

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