- A. Relative volatility is reasonably constant
- B. Mixture (to be separated) shows negative deviation from ideality
- C. Mixture (to be separated) shows positive deviation from ideality
- D. Multicomponent distillation is involved
Mass Transfer
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Fenske’s equation for determining the minimum number of theoretical stages in distillation column holds good, when the_____.
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Pick out the wrong statement:
- A. Change in barometric pressure does not affect the relative humidity
- B. In case of a packed tower, the operating velocity is about half of the flooding velocity, generally
- C. ‘Elution’ means the desorption of the adsorbed solute by a solvent
- D. The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity
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Inside the distillation columns, the_____.
- A. Highest temperatures is near the feed plate
- B. Driving force for the liquid flow is its weight
- C. Vapors are not always at their dew points
- D. All of the above
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With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)
- A. Increases
- B. Remains unchanged
- C. Decreases
- D. Decreases linearly
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In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is_____.
- A. 0.50
- B. 0.60
- C. 2
- D. 1
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At 750°K and 1 atm, the approximate value of Schmidt number for air is_____.
- A. 0.01
- B. 0.1
- C. 1
- D. 10
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In stripping section of continuous distillation column, the_____.
- A. Liquid is stripped of high boiler
- B. Liquid is enriched with high boiler
- C. Vapour is stripped of low boiler
- D. None of these
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‘ADDUCTS’ and ‘CLATHRATES’ are used in case of_____.
- A. Extractive distillation
- B. Crystallisation
- C. Absorption
- D. None of these
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For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will_____.
- A. Increase
- B. Decrease
- C. Remain same
- D. Data insufficient, can’t be predicted
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If a two phase system is in physical equilibrium; then it means that, the_____.
- A. Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
- B. Temperature of the liquid phase is equal to that of the vapor phase
- C. Total pressure throughout the liquid phase is equal to that throughout the vapor phase
- D. All of the above