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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 2
6.
Pick out the correct statement.
Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non-ideal binary system by distillation.
A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn.
Solvent used in extractive distillation should be of high volatility.
Flash distillation is suitable for separating components which have very close boiling temperature.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of
vapour pressure of component A to that of component B.
vapour pressure of component A to the total pressure.
vapour pressure of component A to the partial pressure of A.
partial pressure of component A to the total pressure.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called
decoction
percolation
elutriation or elution
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
In the constant rate period of the rate of drying curve for batch drying,
cracks develop on the surface of the solid.
rate of drying decreases abruptly.
surface evaporation of unbound moisture occurs.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
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%).
15 min
51 min
71 min
94 min
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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