An azeotropic mixture of two liquids has boiling point higher than either of them when it
A.is saturated
B.shows negative deviation from Raoults law
C.shows positive deviation from Raoults law
D.shows no deviation from Raoults law
Category: Mass Transfer Mcqs
Inside the distillation column
A.the driving for the vapour flow is the pressure drop
B.the driving force for the liquid flow is its weight
C.the liquids and vapours are always at their bubble point and dew point respectively
D.all of these answers
For flow of a gas through a given capillary according to Poiseuilles law the permeability
A.remains unaffected with change in temperature
B.increases with increase in temperature
C.decreases with increase in temperature
D.varies as the square root of temperature
In a distillation operation the reflux ratio may vary between
A.zero and one
B.zero and infinity
C.minimum and infinity
D.one and two
The relative volatility of aomponent A relative to component B is equal to the ratio of vapour pressure of component A to vapour pressure of component B at the existing temperature if
A.the total pressure is 1 atm
B.the liquid phase behaves as an ideal solution
C.the vapour phase behaves as an ideal gas
D.both the liquid phase and vapour phase are ideal
At minimum reflux ratio the fixed cost of a distillation column is
A.minimum number of plates
B.infinite
C.optimum
The Schmidt number (NSc) is defined as
A.?/DAB
B.?/?DAB
C.??/DAB
D.?DAB/?
