Chemical Engineering - Mass Transfer

1. 

In a binary system, separation is very efficient, when the relative volatility is

A. 1
B. > 1
C. < 1
D. 0.5

Answer: Option B

Explanation:

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2. 

Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

A. constant molal overflow
B. total reflux
C. constant relative volatility
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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3. 

The binary diffusivity in gases does not depend upon the

A. pressure
B. temperature
C. nature of the components
D. none of these

Answer: Option D

Explanation:

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4. 

Berl saddle made of carbon cannot be used for

A. alkalis
B. SO2
C. H2SO4
D. oxidising atmosphere

Answer: Option D

Explanation:

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5. 

1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

A. 0.4
B. 0.25
C. 0.2
D. 0.175

Answer: Option C

Explanation:

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