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Chemical Engineering :: Heat Transfer

  1. Choose the correct equation.

  2. A.
    Nu = (Re) (Pr) (Gz)
    B.
    Nu = (Re) (Pr) (St)
    C.
    Nu = (Re)(Pr)
    D.
    Nu = (Pr)(St)

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  3. In a forward feed multiple effect evaporator unit

  4. A.
    viscosity of liquid is highest in first effect.
    B.
    transfer from effect to effect is done by pumps.
    C.
    no pump is required to withdraw the product from the last effect.
    D.
    none of these.

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  5. In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

  6. A.
    linear
    B.
    hyperbolic
    C.
    parabolic
    D.
    none of these

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  7. For heat flow through very thick walled cylinder, use____mean radius.

  8. A.
    arithmetic
    B.
    logarithmic
    C.
    geometric
    D.
    either (a) or (c)

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  9. Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

  10. A.
    heat transfer co-efficient are high.
    B.
    there is no risk of contamination.
    C.
    there is no mist formation.
    D.
    cost of equipment is lower.

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  11. Water is normally used as a coolant in the heat exchange equipments mainly because ofits

  12. A.
    abundance & high heat capacity
    B.
    low density
    C.
    low viscosity
    D.
    high fluidity

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  13. The rate of emission of radiation by a body does not depend upon the

  14. A.
    wavelength of radiation.
    B.
    surface temperature of the body.
    C.
    nature of the surface.
    D.
    shape and porosity of the body.

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  15. Which of the following has maximum thermal conductivity at the same temperature?

  16. A.
    Steel
    B.
    Petrol
    C.
    Air
    D.
    All have the same conductivity

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  17. Maximum heat transfer rate is obtained in __________ flow.

  18. A.
    laminar
    B.
    turbulent
    C.
    creeping
    D.
    transition region

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  19. In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

  20. A.
    nucleate
    B.
    local
    C.
    pool
    D.
    saturated

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