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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

0.5
1
2
5

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Mass Transfer
Tower diameter may be decreased by

Use of increased tray spacing
Using higher reflux ratio
Increasing the liquid flow rate
Increasing the vapour flow rate

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Mass Transfer
Unit of molal diffusivity is

Gm moles/cm. sec
Gm moles/cm². sec
Gm moles/cm² . sec
Cm²/sec gm . mole

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

10
5
100
1

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Mass Transfer
Removal of __________ exemplifies an adsorption unit operation.

Ammonia from coke oven gas
None of the listed here
Uranium from its ore
Water from petrol

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Very efficient operation
Thermal decomposition of bottoms
Erosion of the tower
Increased relative volatility

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MORE MCQ ON Mass Transfer

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