Mass Transfer

441.The dew point of a saturated gas phase equals the _________ temperature.

1. Gas
2. Room
3. Wet bulb
4. None of these

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442.The dew point of an unsaturated gas-vapor mixture does not depend upon the _________ of the mixture.

1. Composition
2. Temperature
3. Total pressure
4. All (A), (B) and (C)

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444.The diffusion co-efficient in m²/s. of acetic acid in benzene (liquid in liquid) is

1. 2.09 × 10^-4
2. 2.09 × 10^-5
3. 2.09 × 10^-9
4. 2.09 × 10^-12

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445.The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

1. D ∝ P^0.5
2. D ∝ 1/P^0.5
3. D ∝ 1/P
4. D ∝ 1/P^1.5

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446.The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

1. D ∝ T
2. D ∝ T0.5
3. D ∝ T1.5
4. D ∝ T2

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447.The diffusivity, D_AB(for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of

1. Newtonian liquids
2. Non-Newtonian liquids
3. Ideal gases
4. Real gases

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448.The dimension of diffusivity is same as that of the

1. Density
2. Molal concentration
3. Kinematic viscosity
4. Velocity head

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449.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).

1. √T
2. T
3. T2
4. T3

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450.The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid).

1. √T
2. T
3. T1.5
4. T3

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