Mass Transfer

591.Which of the following parameters remains constant during chemical dehumidification?

1. Dry bulb temperature
2. Partial pressure of vapour
3. Wet bulb temperature
4. None of these

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592.Which of the following plays an important role in problems of simultaneous heat and mass transfer?

1. Lewis number
2. Schmidt number
3. Prandtl number
4. Sherwood number

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593.Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

1. Humidification only
2. Heating only
3. Both heating and humidification
4. Evaporative cooling

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594.Which of the following processes is not an example of adsorption applied to gaseous separations?

1. Recovery of valuable solvent vapors from dilute mixture with air and other gases
2. Dehumidification of air and gas
3. Removal of objectionable odour and impurities from industrial gases
4. Decolouration of yellow glycerine

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595.Which of the following provides maximum contact surface for a liquid-vapour system?

1. Packed tower
2. Bubble-cap plate column
3. Sieve-plate column
4. Wetted wall column

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596.Which of the following quantities need not be fixed before starting the design of a cocurrent absorber?

1. Heat gain or loss
2. Flow rate of entering liquid
3. Flow rate of gas
4. None of these

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597.Which of the following remains constant during evaporative cooling process with recirculated water supply?

1. Relative humidity
2. Partial pressure of vapour
3. Wet bulb temperature
4. None of these

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598.Which of the following remains constant during sensible cooling process?

1. Specific humidity
2. Partial pressure of vapour
3. Both (A) and (B)
4. Neither (A) nor (B)

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599.Which of the following same diameter columns gives lowest pressure drop per unit height?

1. Bubble-cap column
2. Sieve-plate column
3. Packed column (stacked)
4. Randomly packed column

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600.Which of the following solutions will follow Raoult's law most closely?

1. A solution of benzene, toluene and o-xylene
2. 35% solution of camphor in water
3. 35% solution of NH3 in water
4. A solution of polar organic compounds (not of homologue of a series)

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