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Mass Transfer

Mass Transfer
The dew point of a saturated gas phase equals the __________ temperature.

None of these
Wet bulb
Gas
Room

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P < P
P = P
P >>P
P

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T³
√T
T²
T

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Mass Transfer
In azeotropic mixture, the equilibrium vapour composition is

More than liquid composition
None of the listed here
Same as liquid composition
Less than liquid composition

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Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

27.3
21.7
20
18.7

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

K ∝ D
K ∝ D1.5
K ∝ √D
K ∝ D2

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