Mass Transfer - Chemical Engineering Questions and Answers

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When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

temperature rises

pressure rises

temperature falls

pressure falls

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For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re^0.33

Re^0.53

Re^0.83

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The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

temperature rises.

pressure rises.

temperature falls.

pressure falls.

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Unit of molal diffusivity is

cm²/sec gm . mole

gm moles/cm² . sec

gm moles/cm. sec

gm moles/cm². sec

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The term "approach" in a cooling tower refers to the difference in the temperature of the

cold water leaving the tower and the wet bulb temperature of the surrounding air.

hot water entering the tower and the wet bulb temperature of the surrounding air.

hot water entering and the cooled water leaving the cooling tower.

none of these

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Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

unidirectional diffusion from liquid to gas phase

unidirectional diffusion from gas to liquid phase

either 'a' or 'b'

a counter diffusion at an almost equal molar rate