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Mass Transfer

Mass Transfer
Danckwerts developed the __________ theory.

Penetration
None of these
Film
Surface renewal

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

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

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.152
0.079
0.122
0.048

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

1.2 to 1.5
2.5 to 3
5
3 to 4

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Mass Transfer
Which of the following adsorbant is used in the refinning of sugar?

Bone charcoal
Silica gel
Wood charcoal
Activated clay

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Mass Transfer
McCabe-Thiele method of binary distillation does not assume that the

Molar latent heats of all components are equal
Heat of mixing is negligible
None of these
Sensible heat changes are negligible compared with latent heat changes

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