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Chemical Engineering :: Heat Transfer

  1. The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

  2. A.
    lower tube side pressure drop.
    B.
    lower shell side pressure drop.
    C.
    higher tube side heat transfer co-efficient.
    D.
    higher shell side heat transfer co-efficient.

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  3. For a multipass shell and tube heat exchanger, the LMTD correction factor is always

  4. A.
    1
    B.
    > 1
    C.
    < 1
    D.
    between 1 & 2

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  5. If heat transfer rate varies with the time, it is termed as

  6. A.
    forced convection
    B.
    steady state conduction
    C.
    monochromatic radiation
    D.
    none of these

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  7. Pick out the wrong statement.

  8. A.
    Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection.
    B.
    The ratio NNu/NRe . Npr is called the Stanton number.
    C.
    The Peclet number is a measure of the ratio of energy transport by convection to that by conduction.
    D.
    The Colbum jH factor for heat transfer is given by Nst Npr.

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  9. Tube expansion allowances exist in __________ heat exchanger.

  10. A.
    multipass fixed tube sheet
    B.
    U-tube
    C.
    single pass fixed tube sheet
    D.
    none of these

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  11. Pick out the wrong statement.

  12. A.
    In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2.
    B.
    Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number.
    C.
    Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger.
    D.
    Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side.

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  13. Agitated film evaporator is suitable for concentrating __________ liquids.

  14. A.
    foaming
    B.
    viscous
    C.
    very thin
    D.
    corrosive

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  15. The thickness of condensate layer in filmwise condensation depends on the

  16. A.
    condensation rate
    B.
    surface configuration
    C.
    liquid flow rate from the surface
    D.
    all (a), (b) and (c)

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  17. If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

  18. A.
    parabolic
    B.
    hyperbolic
    C.
    linear
    D.
    logarithmic

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