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.Management Sciences
Category: Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the____________________?
A. Temperature rises
B. Pressure rises
C. Temperature falls
D. Pressure falls
An example of elution is______________________?
A. Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank
B. Separation of sugar from sugar beet by hot water
C. Dissolution of tannin out of tree barks by water
D. Recovery of vegetable oils from seeds
In steam distillation, the _____________________?
A. Temperature is 100°C
B. Temperature is more than 100° C
C. Product must be immiscible with water
D. Temperature is higher than the boiling point of either component
Calculation of mass transfer co-efficient is mostly/normally done using ______________ theory?
A. Surface renewal
B. Film
C. Penetration
D. None of these
A good solvent used for absorption should not have very high____________________?
A. Viscosity
B. Vapor pressure
C. Freezing point
D. All A., B. & C.
Entrainer used in Azeotropic distillation should____________________?
A. Form a low boiling azeotrope with one of the constituents of the mixture
B. Form a new azeotrope of low relative volatility with one of the constituents of the mixture
C. Have high latent heat of vaporisation
D. Have high viscosity to provide high tray efficiency
_______________ diffusion is used for separating the isotopes of methane ?
A. Thermal
B. Pressure
C. Concentration
D. Force
In case of ______________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated?
A. Molecular
B. Azeotropic
C. Extractive
D. Flash
Co-current absorbers are usually used when the gas to be dissolved in the liquid is ___________________?
A. Sparingly soluble
B. Highly soluble
C. A pure substance
D. A mixture
Molality is defined as the number of gm moles of solute per _________________ of solvent ?
A. Litre
B. gm
C. Kg
D. m3
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