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Mass Transfer

Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

1
-1
- ve
+ ve

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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%).

51 min
15 min
71 min
94 min

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Mass Transfer
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)

Parallel
Straight
Both A & B
Neither A nor B

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Mass Transfer
Azeotropic distillation is employed to separate

Heat sensitive materials
High boiling mixture
Mixture with very high relative volatility
Constant boiling mixture

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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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Mass Transfer
Small dia distillation column can be a

Sieve tray
Any of these
Bubble cap
Packed column

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