Mass Transfer

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

1. K ∝ D
2. K ∝√D
3. K ∝ D1.5
4. K ∝ D²

View answer

312.Mass transfer co-efficient is defined as

1. Flux = Co-efficient/concentration difference
2. Co-efficient = Flux/concentration difference
3. Flux=concentration difference/coefficient
4. None of these

View answer

313.Mass transfer co-efficient is directly proportional to D_ABaccording to the _________ theory.

1. Film
2. Penetration
3. Surface-renewal
4. None of these

View answer

314.Mass transfer co-efficient is directly proportional to DAB 0.5, according to _________ theory.

1. Penetration
2. Surface renewal
3. Film
4. None of these

View answer

315.Mass transfer co-efficient of liquid is

1. Affected more by temperature than that for gases
2. Affected much less by temperature than that for gases
3. Not affected by the temperature
4. None of these

View answer

316.Mass transfer co-efficient varies as D_AB ^0.5, according to the _________ theory.

1. Film
2. Surface renewal
3. Penetration
4. None of these

View answer

317.Mass transfer rate between two fluid phases does not necessarily depend on the _________ of the two phases.

1. Chemical properties
2. Physical properties
3. Degree of turbulence
4. Interfacial area

View answer

318.McCabe-Thiele method

1. Uses molal units for material and energy balance
2. Uses weight fractions to express liquid and vapour composition
3. Can use any type of units
4. Is more accurate than Ponchon-Savarit method

View answer

319.McCabe-Thiele method of binary distillation does not assume that the

1. Sensible heat changes are negligible compared with latent heat changes
2. Molar latent heats of all components are equal
3. Heat of mixing is negligible
4. None of these

View answer

320.Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a _________ column.

1. Spray
2. Packed
3. Bubble cap plate
4. Wetted wall

View answer