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Mass Transfer

Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F/2
1/f
2f
F

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

√T
T
T³
T²

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Mass Transfer
Rotary dryers cannot handle __________ materials.

Grannular
Dry
Sticky
Free flowing

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Mass Transfer
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

0.25
0.175
0.4
0.2

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

Ponchan-Savarit method
Enthalpy concentration method
McCabe-Thiele method
Plate absorption column

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = a₂
a₁ = 2a₂
None of these
a₁ = 0.5 a₂

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