Chemical Engineering - Mass Transfer

1. 

Perforated plate towers are unique for solvent extraction because, they provide

A. higher contact area.
B. better contact of the phase.
C. repeated coalescence & redispersion of the drop phase.
D. none of these.

Answer: Option C

Explanation:

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2. 

In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

A. interface
B. gas phase
C. liquid phase
D. all 'a', 'b' & 'c'

Answer: Option A

Explanation:

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3. 

Pick out the wrong statement pertaining to the analogy between equations of heat and mass transfer operations.

A. Sherwood number in mass transfer is analogous to Nusselt number in heat transfer.
B. Prandtl number in heat transfer is analogous to Schmidt number in mass transfer.
C. Reynolds number in mass transfer is analogous to Grashoff number in heat transfer.
D. Reynolds number remains the same in both heat and mass transfer.

Answer: Option C

Explanation:

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4. 

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

A. 0
B.
C. -ve
D. +ve

Answer: Option C

Explanation:

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5. 

The individual mass transfer co-efficients (moles/m2 . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

A. liquid side
B. gas side
C. interfacial
D. both liquid and gas side

Answer: Option B

Explanation:

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