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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

0.5
5
1
2

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Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

Twice
More than
Half
Equal to

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Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Long tube
Vacuum
Falling film
Short tube

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Mass Transfer
NSc/NPr is called the

Psychrometric ratio
Sherwood number
Stantan number
Lewis number

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Mass Transfer
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

Bound
Unbound
Free
Critical

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Zero
Maximum
Infinite
Minimum

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