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Chemical Engineering :: Heat Transfer

  1. Crystallisation of solids from a homogeneous solution is a/an __________ process.

  2. A.
    exothermic
    B.
    mildly endothermic
    C.
    highly endothermic
    D.
    none of these

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  3. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

  4. A.
    6000
    B.
    24000
    C.
    60000
    D.
    48000

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  5. Value of Prandtl number for water ranges from

  6. A.
    l to 2
    B.
    5 to 10
    C.
    100 to 500
    D.
    1000 to 2000

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  7. Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

  8. A.
    eddies current
    B.
    conduction
    C.
    convection
    D.
    none of these

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  9. Among liquids, water has a comparatively high value of thermal conductivity, due to its

  10. A.
    low density
    B.
    high viscosity
    C.
    partial ionisation
    D.
    dense structure

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  11. Reynold's analogy states that (where, St = Stanton number f = friction factor)

  12. A.
    B.
    C.
    St = 4f
    D.
    St = f1/2

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  13. For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is

  14. A.
    forward
    B.
    backward
    C.
    parallel
    D.
    none of these

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  15. The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

  16. A.
    cummulatively increases
    B.
    cummulatively decreases
    C.
    remains constant
    D.
    and the surface conductance increase

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  17. In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.

  18. A.
    increases
    B.
    decreases
    C.
    does not affect
    D.
    may increase or decrease, depends on the type of baffle

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  19. The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

  20. A.
    t
    B.
    ∝ 1/t
    C.
    t
    D.
    independent of 't'

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