Related Questions

In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.
A Greater than
B Smaller than
C Equal to
D Either A, or B ; depends on the type of packing
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
A 45
B 60
C 80
D 95
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.
A $${\frac{1}{{10}}^{{\text{th}}}}$$
B $${\frac{1}{{20}}^{{\text{th}}}}$$
C $${\frac{1}{{30}}^{{\text{th}}}}$$
D $${\frac{1}{{50}}^{{\text{th}}}}$$
When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.
A Packed
B Spray
C Tray
D Bubble
Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).
A H
B 12.6 H
C 13.6 H
D 14.6 H
Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.
A Small differential
B Atmospheric
C Absolute
D Gage
Extraction of pencillin employs a __________ extraction coloumn.
A Centrifugal
B Packed
C Plate
D None of these
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
A Operating
B Total
C Minimum
D Maximum permissible
Minimum possible diameter of a packed coloumn is decided mainly by the
A Flooding
B Gas viscosity
C Liquid density
D Liquid hold up
As the reflux ratio in a distillation coloumn is increased from the minimum, the
A Slope of the operating line in stripping section decreases
B Number of plates decreases very slowly first and then more and more rapidly
C Total cost first decreases and then increases
D Liquid flow increases while the vapor flow decreases for a system

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