7571. Laboratory determination of the dif-fusivity of vapor is done by __________ method.
Wetted wall column
Gilliland’s
Winkel mann’s
Wike’s
✅ The correct answer is option C.
Chemical Engineering
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7572. Drying of a solid involves __________ transfer.
Only heat
Only mass
Both heat and mass
None of these
✅ The correct answer is option C.
7573. Channelling in a packed tower results from the
High pressure drop
Maldistribution of liquid
Non-uniformity of packing
Both B and C
✅ The correct answer is option D.
7574. The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.
Heat and mass
Mass and momentum
Heat and momentum
Heat, momentum and mass
✅ The correct answer is option A.
7575. The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.
Plug
Perfectly mixed
Both A & B
Neither A nor B
✅ The correct answer is option A.
7576. The diffusion co-efficient in m² /s. of acetic acid in benzene (liquid in liquid) is
2.09 x 10-4
2.09 x 10-5
2.09 x 10-9
2.09 x 10-12
✅ The correct answer is option A.
7577. For absorbers, high pressure drop results in
Increased efficiency
Decreased efficiency
High operating cost
Better gas liquid contact
✅ The correct answer is option C.
7578. In case of a desorber (stripper), the
Operating line always lies above the equilibrium curve
Operating line always lies below the equilibrium curve
Temperature remains unaffected
Temperature always increases
✅ The correct answer is option B.
7579. If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)
(1 – f)/f
#REF!
#REF!
#REF!
✅ The correct answer is option C.
7580. Removal of __________ exemplifies an adsorption unit operation.
Uranium from its ore
Water from petrol
Ammonia from coke oven gas
Mustard oil from mustard seed
✅ The correct answer is option B.