Chemical Engineering - Mass Transfer

46. 

Positive deviation from Raoult's law means a mixture whose total pressure is

A. greater than that computed for ideality.
B. less than that computed for ideality.
C. less than the sum of the vapour pressure of the components.
D. none of these.

Answer: Option A

Explanation:

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47. 

With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

A. increases
B. decreases
C. decreases linearly
D. remains unaffected

Answer: Option A

Explanation:

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48. 

Schmidt number is given by

A.
B. Re.Pe
C. Sh x Pe
D. Re/Pe

Answer: Option A

Explanation:

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49. 

The caking of crystals can be prevented by

A. maintaining high critical humidity.
B. maintaining low critical humidity.
C. coating the product with inert material.
D. both (a) and (c)

Answer: Option D

Explanation:

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50. 

Prandtl number for water at 20°C is about

A. 7
B. 70
C. 0.7
D. 150.

Answer: Option A

Explanation:

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