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Mass Transfer

Mass Transfer
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

Rotary
Tray
None of these
Tunnel

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Mass Transfer
_______ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.

Stanton
Peclet
Lewis
Sherwood

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Mass Transfer
In most of the vacuum crystalliser, vacuum is generally produced by means of a

Compressed air jet
Suction pump
None of these
Steam jet ejector with a barometric condenser

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Mass Transfer
Lewis number (Le) is

St x Sh
Sc x Pr
Sh x Pr
Pr x St

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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
0.2
0.4
0.175

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Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

None of these
High temperature
Perfectly dry
Highly humid

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