If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________
A. 0
B. 1
C. 1
Mass Transfer
_____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?
_____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?
A. Furfural
B. Benzol
C. Butyl acetate
D. Hexane
Steady state equimolal counter diffusion occurs in case of ____________________?
Steady state equimolal counter diffusion occurs in case of ____________________?
A. Leaching
B. Absorption
C. Binary phase distillation
D. Liquid-liquid extraction
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ?
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripg and rectifying sections coincide with the diagonal at ________________ reflux ?
A. Total
B. Minimum
C. Operating
D. Maximum permissible
Equilibrium-moisture curves of different solids ____________________ ?
Equilibrium-moisture curves of different solids ____________________ ?
A. Are different
B. Are same
C. Depend on the humidity of the gas
D. None of these
The vapour pressure exerted by the moisture contained in a wet solid depends upon the____________________?
The vapour pressure exerted by the moisture contained in a wet solid depends upon the____________________?
A. Nature of the moisture
B. Temperature
C. Nature of the solid
D. All A., B. and C.
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as___________________?
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as___________________?
A. Re0.33
B. Re0.53
C. Re0.83
D. Re
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas________________?
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas________________?
A. Increases
B. Decreases
C. Decreases linearly
D. Remain unaffected
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
A. 0
B. 1
C. ∞
D. < 1
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the ______________ temperature?
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the ______________ temperature?
A. Dew point
B. Wet bulb
C. Dry bulb
D. None of these