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Mass Transfer

Mass Transfer
Sticky material can be dried in a __________ dryer.

Rotary
Tray
None of these
Fluidised bed

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Mass Transfer
Molecular seives are porous

None of these
Silica
Synthetic zeolites crystals/metal alumino-silicates
Alumina

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Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Operating line lies above the equilibrium line
Pressure drop in the column is very high
Operating line lies below the equilibrium line
Both operating and equilibrium lines are parallel

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Mass Transfer
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the

Concentration
None of these
Nature of the constituents
Temperature and pressure

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

71 min
51 min
94 min
15 min

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Mass Transfer
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is

∞
+ve
-ve

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