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Chemical Engineering :: Heat Transfer

  1. Crystal size in a continuous crystalliser depends upon the

  2. A.
    rate of heat transfer.
    B.
    degree of turbulence.
    C.
    degree of supersaturation.
    D.
    all (a), (b) and (c).

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  3. Heat waves

  4. A.
    can not pass through vacuum.
    B.
    travel in straight line.
    C.
    can be reflected by a mirror.
    D.
    both (b) and (c).

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  5. Air is best heated with steam in a heat exchanger of

  6. A.
    plate type.
    B.
    double pipe type with fin on steam side.
    C.
    double pipe type with fin on air side.
    D.
    shell and tube type.

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  7. Which of the following is generally considered as opaque surface towards radiations?

  8. A.
    Gases
    B.
    Solids
    C.
    Liquids
    D.
    Both (b) and (c)

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  9. Black liquor generated during paper manufacture is concentrated in a

  10. A.
    single effect evaporator.
    B.
    single effect evaporator followed by a crystalliser.
    C.
    multiple effect evaporator.
    D.
    multiple effect evaporators followed by a crystalliser.

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  11. When vaporisation takes place directly at the heating surface, it is called

  12. A.
    film boiling
    B.
    nucleate boiling
    C.
    vapour binding
    D.
    none of these

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  13. Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)

  14. A.
    C/E
    B.
    E/C
    C.
    CE
    D.

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  15. Reynold's analogy states that

  16. A.
    Nst α f
    B.
    Nst α NRe
    C.
    NNu α f
    D.
    NRe α f

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  17. With increase in temperature, the thermal conductivity of non-metallic amorphous solids

  18. A.
    decreases
    B.
    increases
    C.
    remains constant
    D.
    first decreases upto certain temperature and then increases

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  19. Fourier's law applies to the heat transfer by

  20. A.
    convection
    B.
    radiation
    C.
    conduction
    D.
    all (a), (b) & (c)

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