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

Correct Answer: Packing may be crushed due to thermal expansion/contraction of the components of the equipments

Bissoy MCQ
#Chemical Engineering #Mass Transfer

Related Questions

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
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
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
Perforated plate towers are unique for solvent extraction because, they provide
A Higher contact area
B Better contact of the phase
C Repeated coalescence & redispersion of the drop phase
D None of these
Very tall packed towers are divided into series of beds to
A Reduce the overall pressure drop
B Avoid channelling
C Reduce liquid hold-up
D Avoid flooding
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
A machine part is packed in a box of size 5cm x 4cm x 2cm. The number of parts that can be packed in a carton of size 25cm x 16cm x 8cm is-
A 60
B 80
C 40
D 160
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
Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.
A 4-8
B 17-34
C 52-68
D 88-105

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