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.Management Sciences
Category: Mass Transfer
Adsorption is a unit operation which generally involves _______________ systems?
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A. Liquid-solid
B. Gas-solid
C. Fluid-solid
D. Solid-solid
Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ?
A. Sieve plate column
B. Bubble cap column
C. Randomly packed column
D. Wetted wall column
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around _________________ Rm ?
A. 1.2 to 1.5
B. 2.5 to 3
C. 3 to 4
D. 5
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?
A. Low pressure drop and high hold up
B. High pressure drop and low hold up
C. Low pressure drop and low hold up
D. High pressure drop and high hold up
Percentage saturation is _______________ the relative saturation?
A. Always smaller than
B. Always greater than
C. Not related to
D. None of these
Alcohol is dehydrated using _______________________ distillation?
A. Extractive
B. Azeotropic
C. Steam
D. Molecular
The commonly used solvent in supercritical extraction is_____________________?
A. Methyl ethyl ketone
B. Water
C. Carbon tetrachloride
D. Carbon dioxide
Raschig ring made of porcelain cannot be used for treating concentrated___________________?
A. Hydrochloric acid
B. Nitric acid
C. Alkalis
D. Sulphuric acid
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