Mass Transfer

241.In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be

1. Liquid phase resistance-controlled
2. Gas phase resistance controlled
3. Impossible
4. Driven by a non-linear driving force

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242.In an operating distillation column, the

1. Vapors and liquids are at their dew point and bubble point respectively
2. Driving force for the liquid flow is its specific weight
3. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
4. Highest temperature is encountered at the top of the column

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243.In Azeotropic mixture, the equilibrium vapour composition is

1. More than liquid composition
2. Less than liquid composition
3. Same as liquid composition
4. Independent of pressure

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244.In batch distillation with constant reflux, overhead product composition _________ with time.

1. Increases
2. Decreases
3. Does not vary
4. May increase on decrease, depends on the system

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245.In case of _________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

1. Molecular
2. Azeotropic
3. Extractive
4. Flash

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246.In case of a desorber (stripper), the

1. Operating line always lies above the equilibrium curve
2. Operating line always lies below the equilibrium curve
3. Temperature remains unaffected
4. Temperature always increases

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247.In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _________ is zero.

1. Interface
2. Gas phase
3. Liquid phase
4. All 'a', 'b' & 'c'

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248.In case of absorption with exothermic reaction, for fluids having

1. Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
2. Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
3. Both (A) and (B)
4. Pr = Sc; there won't be any change in heat and mass transfer flux with changes in degree of turbulence

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249.In case of absorption, both the operating and equilibrium lines will be straight for

1. Isothermal operation
2. Dilute solutions
3. Dilute solutions and isothermal operation
4. None of these

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250.In case of an absorber, the operating

1. Line always lies above the equilibrium curve
2. Line always lies below the equilibrium curve
3. Line can be either above or below the equilibrium curve
4. Velocity is more than the loading velocity

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