For pure air at atmospheric conditions the Schmidt number is
A.< 1
B.1
C.>1
D.>>1
Category: Mass Transfer Mcqs
For the system air-water vapour hG/ky Cs is approximately equal to
A.1
B.0.24
C.2.4
D.3
An ideal plate is defined as one where
A.the vapour and liquid leaving streams are in equilibrium
B.the vapour and liquid entering streams are in equilibrium
C.the vapour leaving stream is in equilibrium with the liquid entering stream
D.the vapour entering stream is in equilibrium with the liquid leaving stream
For obtaining a given separation in distillation column the minimum number of theoretical stages is obtained with
A.minimum reflux ratio
B.optimum reflux ratio
C.total reflux
D.zero reflux ratio
For flow of gas through a capillary according to Poiseuilles law the permeability
A.varies inversely as the gas viscosity
B.is proportional to the gas viscosity
C.varies as the square root of gas viscosity
D.varies as the square of the gas viscosity
Solvent used in extractive distillation
A.alters the relative volatility of the original components
B.is of low volatility
C.must form no azeotrope with the original substances
D.all of these answers
The Lewis number of a mixture is defined as
A.NPr/NSc
B.NPr NSc
C.NSc/NPr
D.Cs (NSc/NPr)
Which of the following is the most important to separate a mixture of two volatile liquids by distillation?
A.Solubility
B.Relative volatility
C.Density difference
D.Selectivity
