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Mass Transfer

Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Vacuum rotary
Fluidised bed
Spouted bed
Tray

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

(G.a)/FG
L/(FG.G)
FG/(G.a)
F/(FG.a)

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Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

5 metres above ground
10 metres above ground
At ground level
2 metres above the ground

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Mass Transfer
Large scale usage of flash distillation is practised in

Ammonia synthesis plant
Polymerisation industry
Petroleum refinning
Soap manufacturing

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Mass Transfer
During the constant rate period of drying of a solid,

Surface evaporation of unbound moisture occurs
Increasing the air temperature decreases the drying rate
None of these
Increased air humidity decreases the rate of drying

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Mass Transfer
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

50
78
100
None of these

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