In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?

Related Mcqs:

Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?

A. 16 B. 19 C. 28 D. 38...

The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?

A. 0.6-0.8 times B. Equal to C. Twice D. 2 ft irrespective of (for column > 3 ft diameter)...

In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?

A. Z.H.ρ/L B. L/Z.H.ρ C. H.ρ/L D. Z.H/ρL...

A pressure vessel is said to be made of ‘thick’ shell, if the ratio of its diameter to wall thickness is_______________?

A. < 10 B. > 10 C. > 20 D. < 20...

The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?

A. 0.1-0.2 B. 0.2-0.5 C. 0.4-0.9 D. 1.2-1.5...