At total reflux the capacity of a distillation colum is
A.zero and one
B.maximum
C.minimum
D.optimum
Category: Mass Transfer Mcqs
If q is interpreted to be the fraction of the feed that is liquid then the slope of the feed line in distillation operation is
A.?(1-q)/q
B.?q/(1-q)
C.?q
D.?q/(q-1)
The steady-state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called
A.dry-bulb temperature
B.dew point
C.wet-bulb temperature
D.bubble point
Which of the following systems is an example of minimum boiling azeotrope at 1 atm?
A.Carbon disulphide-acetone
B.Ethanol-water
C.Benzene-ethanol
D.Acetone-chloroform
The Schmidt number (NSc) is the ratio of
A.the momentum diffusivity to the mass diffusivity
B.the mass diffusivity to the momentum diffusivity
C.the thermal diffusivity to the mass diffusivity
D.the momentum diffusivity to the thermal diffusivity
Relative volatility ? for a binary system
A.decreases with increase in pressure
B.increases with increase in pressure
C.increases with increase in temperature at constant pressure
D.has no significance in distillation operation
The diffusivity has the same dimensions as
A.absolute viscosity
B.kinematic viscosity
C.density
D.concentration
Peclet number (NPe) for mass transfer is defined as
A.NRe/NSc
B.NReNSc
C.NSc/NRe
D.NShNSc
The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is non-linear
A.in the case of steady-state equimolal counter-diffusion
B.in the case of steady-state unimolal unidirectional diffusion
C.both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion
