Process Equipment and Plant Design
Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?

All of these
Density and viscosity of fluids
Size, shape, orientation and surface of the packing particles
Fluid flow rates

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Process Equipment and Plant Design
Generally, elliptical dished heads

Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
All of these
Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

Liquor is inside the tube while the steam is outside the tube
All of these
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube

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