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Chemical Engineering :: Heat Transfer

  1. The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

  2. A.
    2
    B.
    1/2
    C.
    4
    D.
    1/4

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  3. Terminal point temperature differences between fluids in case of a heat exchanger is termed as

  4. A.
    approach.
    B.
    log mean temperature difference.
    C.
    arithmetic mean temperature difference.
    D.
    geometric mean temperature difference.

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  5. LMTD can't be used as such without a correction factor for the

  6. A.
    multipass heat exchanger.
    B.
    baffled heat exchanger.
    C.
    condensation of mixed vapour in a condenser.
    D.
    all (a) (b) and (c).

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  7. Fqra cold viscous feed, backward feed gives __________ than forward feed.

  8. A.
    a higher capacity
    B.
    a lower capacity
    C.
    lower economy
    D.
    none of these

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  9. Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

  10. A.
    35.5
    B.
    43.75
    C.
    81.25
    D.
    48.25

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  11. Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then

  12. A.
    U1 = U2
    B.
    U2 > U1
    C.
    U1 > U2
    D.
    U1 = dirt factor - U2

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  13. In SI units, thermal conductivity is expressed in

  14. A.
    Watt/m.°K
    B.
    Watt/m2. °K
    C.
    Watt/m2. °K
    D.
    Watt/m4. °K

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  15. Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

  16. A.
    boiling point (at the same pressure)
    B.
    viscosity
    C.
    density
    D.
    thermal conductivity

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  17. The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

  18. A.
    average
    B.
    geometric mean
    C.
    product
    D.
    sum

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  19. At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

  20. A.
    0.5
    B.
    < 0.5
    C.
    > 0.6
    D.
    < 0.1

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