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Mass Transfer

Mass Transfer
Which of the following is not a continuous drier?

Drum drier
Tray drier
Tunnel drier
Spray drier

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Mass Transfer
The most efficient cooling tower out of the following is

Induced draft
Atmospheric
Forced draft
Natural draft

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Mass Transfer
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

6
8
12
10

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Mass Transfer
Capacity of a rotary dryer depends on its

Both Inclination with ground surface & R.p.m
R.p.m
Inclination with ground surface
None of the listed here

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Increase
Remains same
Decrease
Depend on saturated boiling point; may increase or decrease

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Mass Transfer
Minimum possible diameter of a packed coloumn is decided mainly by the

Gas viscosity
Liquid density
Liquid hold up
Flooding

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