Related Questions

Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
A Packing may be crushed due to thermal expansion/contraction of the components of the equipments
B Pressure drop in the equipment will be very high
C Viscosity variation of the fluids may cause channeling/flooding
D None of these
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
A Molal flow rate of vapour
B Vapour molecular weight
C Pressure and temperature
D All of the above
A packed tower compared to a plate tower for a particular mass transfer operation
A Incurs smaller pressure drop
B Allows installation of cooling coils
C Is less costly when built in large sizes/diameters
D Is more suitable, if suspended solids are present in fluid streams
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
A Is greater than
B Is lower than
C Is same as
D Cannot be predicted as data are insufficient
The main reason for dividing a tall packed tower into series of small towers is to
A Minimise the overall pressure drop
B Avoid flooding
C Reduce liquid hold up
D Avoid channeling
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be
A Less
B More
C Equal
D Either A or B; depends on the packing height
Kelly and Chris packed several boxes with books. If Chris packed 60 percent of the total number of boxes, what was the ratio of the number of boxes Kelly packed to the number of boxes Chris packed?
A 1 to 6
B 1 to 4
C 2 to 5
D 2 to 3
Use of packed towers for distillation is generally limited to the
A Small sizes
B Multicomponent distillation
C High pressure operation
D Vacuum distillation
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is
A [

A.

B.

B > 7
C > 20
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
A 5-10
B 30-80
C 150-250
D 350-400

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