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Chemical Engineering :: Heat Transfer

  1. Duhring rule is important in solving problems on

  2. A.
    distillation
    B.
    crystallisation
    C.
    evaporation
    D.
    humidification

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  3. In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell)

  4. A.
    0.25 D
    B.
    0.75 D
    C.
    0.50 D
    D.
    none of these

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  5. Multiple effect evaporation is generally recommended, when the

  6. A.
    large scale evaporation of liquor is needed.
    B.
    corrosive liquids are to be concentrated.
    C.
    fuel is cheaply available.
    D.
    evaporation on small scale is to be done.

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  7. The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

  8. A.
    20.8
    B.
    40.8
    C.
    40.4
    D.
    20.4

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  9. __________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.

  10. A.
    Single pass, fixed tube sheet
    B.
    U-tube
    C.
    Three pass, fixed tube sheet
    D.
    none of these

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  11. In which mode of heat transfer, the Biot number is important ?

  12. A.
    Transient heat conduction
    B.
    Natural convection
    C.
    Forced convection
    D.
    Radiation

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  13. __________ paint has the minimum absorption co-efficient.

  14. A.
    Black
    B.
    White lead
    C.
    Grey
    D.
    Light cream

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  15. Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

  16. A.
    exit-fluid temperature > wall temperature.
    B.
    exit fluid temperature < wall temperature.
    C.
    exit fluid temperature = wall temperature.
    D.
    Graetz number > 100.

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  17. 1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

  18. A.
    520
    B.
    200
    C.
    400
    D.
    500

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  19. Which is the most suitable for the con-certration of highly concentrated solution?

  20. A.
    Open pan evaporation
    B.
    Long tube vertical evaporator
    C.
    Agitated film evaporator
    D.
    None of these

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