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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ D1.5
K ∝ D2
K ∝ √D
K ∝ D

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Mass Transfer
Packed column distillation is limited to the column __________ metres.

Neither A nor B
Diameter < 0.6
Height < 6
Both A & B

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Mass Transfer
Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.

Agitated vessel
Bubble cap column
Packed tower
Sieve tray column

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Relative humidity
None of these
Wet bulb temperature
Partial pressure of water vapor

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Anthracite coal
Bamboo
Rag paper
Inorganic solids

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Mass Transfer
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.

None of these
Sherwood
Grashoff
Lewis

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