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.Management Sciences
Category: Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?
A. Grid tray tower
B. Perforated tray tower
C. Wetted wall tower
D. Bubble cap tower
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?
A. Schmidt
B. Sherwood
C. Peclet
D. Stanton
Advantage of continuous drying over batch drying is that the_____________________?
A. Drying cost per unit weight of dried product is less
B. Product with more uniform moisture content is produced
C. Equipment size required is smaller
D. All A , B. & C.
______________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction ?
A. Packed
B. Bubble
C. Spray
D. Tray
For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a _______________ of the equilateral triangular co-ordinates?
A. Binary mixture is represented by the apex
B. Binary mixture is represented by any point inside
C. Ternary mixture is represented by the sides
D. Pure component is represented by the apex
Pick out the wrong statement ?
A. Mechanical agitation is required, if the system has low interfacial tension
B. Sieve tray towers are generally used for systems having low interfacial tension
C. When Henry’s law constant is very small, then the mass transfer rate is controlled by the gas
film resistance
D. Taylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar
and turbulent layers
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the _______________ moisture?
A. Bound
B. Unbound
C. Critical
D. None of these
In an operating distillation column, the______________________?
A. Vapors and liquids are at their dew point and bubble point respectively
B. Driving force for the liquid flow is its specific weight
C. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from
the bottom to the top of the column
D. Highest temperature is encountered at the top of the column
McCabe-Thiele method________________?
A. Uses molal units for material and energy balance
B. Uses weight fractions to express liquid and vapour composition
C. Can use any type of units
D. Is more accurate than Ponchon-Savarit method
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