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Chemical Engineering :: Process Equipment and Plant Design

  1. In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

  2. A.
    Aa = Sa
    B.
    1.2 Aa = 1.2 Sa
    C.
    Sa = 1.5 Aa
    D.
    Aa = 1.5 Sa

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  3. Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

  4. A.
    hG = 1.004G0.37
    B.
    1.004G0.8
    C.
    hG = 0.0176G0.37
    D.
    0.0176G1.37

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  5. In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

  6. A.
    D2
    B.
    D5
    C.
    D
    D.
    D9

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  7. Apex angle of conical heads used in the bottom heads of chemical process equipments is usually

  8. A.
    30°
    B.
    45°
    C.
    60°
    D.
    75°

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  9. Pressure drop due to pipe fittings can be estimated by the equation,
    , where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (dimensionless) for 45° elbow and 180° close return bends would be respectively around

  10. A.
    5 and 10
    B.
    45 and 75
    C.
    180 and 300
    D.
    300 and 500

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  11. A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is

  12. A.
    10
    B.
    10
    C.
    20
    D.
    20

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  13. Rate of filtrate delivery is inversely proportional to the

  14. A.
    filtering area & the pressure difference driving force.
    B.
    viscosity of filtrate.
    C.
    cake & filter medium resistance.
    D.
    both (a) and (b)

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  15. Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to

  16. A.
    G0.2
    B.
    G0.5
    C.
    G0.8
    D.
    G1.5

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  17. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.

  18. A.
    half
    B.
    equal to
    C.
    twice
    D.
    eight times

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  19. The dust collection efficiency of electrostatic precipitator increases with increase in the

  20. A.
    gas flow rate.
    B.
    electrode area.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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