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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).

  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).

  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.

  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)

  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.

  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

  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.

  15. Reynold's analogy states that

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

  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

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

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