Chemical Engineering · all questions

Mass Transfer
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656

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Q641

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

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Q642

With increase in pressure, the relative volatility for a binary system

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Q643

To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

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Q644

__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

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Q645

The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

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Q646

Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

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Q647

For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

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Q648

At minimum reflux ratio for a given separation

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Q649

An azeotropic mixture is a __________ mixture.

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Q650

The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

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Q651

Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.

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Q652

Pick out the wrong statement.

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Q653

Large quantity of silica gel is normally dried in a __________ dryer.

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Q654

Refractory bricks are usually dried in a __________ dryer.

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Q655

Adsorption is an unit operation which generally involves __________ systems.

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Q656

For absorbing a sparingly soluble gas in a liquid, the

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