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Mass Transfer

Mass Transfer
Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.

Rotary
Tunnel
Tray
Vacuum

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Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Thermal diffusivity
Kinematic viscosity
Volumetric diffusivity
Mass transfer co-efficient

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Fick
Stefan
Danckwerts

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Mass Transfer
Perforated plate towers are unique for solvent extraction because, they provide

None of these
Higher contact area
Better contact of the phase
Repeated coalescence & redispersion of the drop phase

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Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Increases
Decreases
Either A or B; depends on the gas
Remains same

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Does not affect the moisture content of the wet solid
Does not change with time
Increases with time
Decreases with time

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