Mass Transfer

281.In stripping section of continuous distillation column, the

1. Liquid is stripped of high boiler
2. Liquid is enriched with high boiler
3. Vapour is stripped of low boiler
4. None of these

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282.In the absorption of ammonia in water, the main resistance to absorption is by the _________ phase.

1. Liquid
2. Gas
3. Both (A) & (B)
4. Neither (A) nor (B)

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283.In the constant rate period of the rate of drying curve for batch drying,

1. Cracks develop on the surface of the solid
2. Rate of drying decreases abruptly
3. Surface evaporation of unbound moisture occurs
4. None of these

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284.In the desorption of highly soluble gas from the liquid, the main resistance will be in the _________ phase.

1. Gas
2. Liquid
3. Both (A) & (B)
4. Neither (A) nor (B)

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285.In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

1. At ground level
2. 2 metres above the ground
3. 5 metres above ground
4. 10 metres above ground

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286.In triangular co-ordinates, the ternary composition point falls _________ of the triangle.

1. In the corners
2. Inside
3. On the sides
4. None of these

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287.In which of the following unit operations, the selectivity is an important parameter?

1. Distillation
2. Solvent extraction
3. Absorption
4. None of these

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288.Inside the distillation column, the

1. Driving force for the vapour flow is the pressure drop
2. Liquids are not always at their bubble points
3. Pressure increases gradually from bottom to the top of the column
4. None of these

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289.Inside the distillation columns, the

1. Highest temperatures is near the feed plate
2. Driving force for the liquid flow is its weight
3. Vapors are not always at their dew points
4. All (A), (B) and (C)

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290.Ion exchange process is similar to

1. Absorption
2. Adsorption
3. Extraction
4. Leaching

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