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Mass Transfer

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

Vacuum rotary
Spouted bed
Tray
Fluidised bed

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

94 min
51 min
71 min
15 min

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Mass Transfer
Leaching of uranium ore and gold ore is done in

Centrifugal extractor
Pachuka tanks
None of these
Bollman extractor

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-0.6
-1.5
1.5
0.6

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Mass Transfer
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is

0.215
0.31
0.017
0.107

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Mass Transfer
Which of the following employs an accessory known as 'drift eliminator' ?

Rotary dryer
Mechanical draft cooling tower
Rotating disc contactor
Multiple effect evaporator

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