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.Management Sciences
Category: Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm ?
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A. Benzene-toluene
B. Ethyl alcohol-water
C. Hydrochloric acid-water
D. All A., B. and C.
Reverse osmosis is also called_________________?
A. Dialysis
B. Electrodialysis
C. Diffusion
D. Ultra-filtration
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the___________________?
A. Gas film
B. Liquid film
C. Liquid-gas interface
D. None of these
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ?
A. Lewis
B. Grashoff
C. Sherwood
D. None of these
With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ?
A. Increases
B. Decreases
C. Remain same
D. Increases linearly
Large quantity of silica gel is normally dried in a _________________ dryer?
A. Freeze
B. Through circulation
C. Rotary vacuum
D. Tray
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________?
A. Humidity
B. Velocity
C. Temperature
D. All A., B. & C.
Sticky material can be dried in a ________________ dryer ?
A. Tray
B. Rotary
C. Fluidised bed
D. None of these
Air at a particular humidity is heated in a furnace. The new dew point_____________________?
A. Decreases
B. Increases
C. Depends on the extent of heating
D. Remain unchanged
Which of the following assumes constant molal vaporisation and overflow ?
A. McCabe-Thiele method
B. Ponchan-Savarit method
C. Enthalpy concentration method
D. Plate absorption column
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