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Mass Transfer

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

Spouted bed
Rotary
Truck
Tray

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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%).

71 min
94 min
51 min
15 min

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

< 1
> 1
1

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Mass Transfer
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

-25
25
> 25
< 25

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Mass Transfer
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its

Heat of wetting
Heat of normal condensation
Differential heat of adsorption
Integral heat of adsorption

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Increase in flow rate
Sharp rise in pressure drop
Sharp drop in pressure drop
None of these

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