Mass Transfer - Chemical Engineering Questions and Answers

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In case of a desorber (stripper), the

operating line always lies above the equilibrium curve.

operating line always lies below the equilibrium curve.

temperature remains unaffected.

temperature always increases.

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What is the reflux ratio at total reflux ?

Zero

Infinity

Unity

Data insufficient

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Under conditions of flooding in packed tower, the gas pressure drop

decreases rapidly

increases rapidly

remains constant

is maximum

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For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

1-5

10-60

200-300

> 500

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For absorbing a sparingly soluble gas in a liquid

gas side mass transfer co-efficient should be increased.

liquid side mass transfer co-efficient should be increased.

liquid side mass transfer co-efficient should be decreased.

mass transfer co-efficient must be kept constant.

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Channelling in a packed tower results from the

high pressure drop

maldistribution of liquid

non-uniformity of packing

both (b) and (c)

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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

integral heat of adsorption.

heat of wetting.

differential heat of adsorption.

heat of normal condensation.