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Mass Transfer

Mass Transfer
Sticky material can be dried in a __________ dryer.

Tray
Rotary
None of these
Fluidised bed

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Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Infinite trays and minimum reboiler heat load
Minimum trays and minimum reboiler heat load
Minimum trays and maximum reboiler heat load
Infinite trays and maximum reboiler heat load

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

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

Humidified with wet bulb temperature decreasing
Dehumidified
None of these
Humidified at constant wet bulb temperature

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ro) = Ro/Ri
(1 - Ri) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 + Ri) = Ro/Ri

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Mass Transfer
Mass transfer co-efficient is defined as

Flux = Co-efficient/concentration difference
Flux=concentration difference/co-effi-cient
None of the listed here
Co-efficient = Flux/concentration difference

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