Mass Transfer

571.Which of the following equipments is not used in liquid-liquid extraction?

1. Pachuka tank
2. Agitated vessels
3. Centrifugal extractors
4. Packed towers

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572.Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

1. Grid tray tower
2. Perforated tray tower
3. Wetted wall tower
4. Bubble cap tower

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573.Which of the following has the same dimension as mass diffusivity?

1. Momentum flux
2. Kinematic viscosity
3. Thermal diffusivity
4. Both (B) and (C)

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574.Which of the following increases during evaporative cooling process with recirculated water supply?

1. Wet bulb temperature
2. Relative humidity
3. Partial pressure of vapour
4. Both (B) and (C)

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575.Which of the following is a suitable absorbent for removal of H2S from natural gas?

1. Vetrocoke solution
2. Monoethanolamine (MEA)
3. Dilute
4. Hot water

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576.Which of the following is an undesirable characteristic for the solvent used in gas absorption?

1. Low vapor pressure
2. Low viscosity
3. High gas solubility
4. None of these

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577.Which of the following is an undesirable property for an absorbing solvent?

1. Low vapour pressure
2. Low velocity
3. Low freezing point
4. None of these

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578.Which of the following is an undesirable property in a tower packing?

1. Large surface per unit volume
2. Large free cross-section
3. Low weight per unit volume
4. Large weight of liquid retained

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579.Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method?

1. Partial condenser
2. Total condenser
3. Reboiler
4. Both (B) and (C)

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580.Which of the following is directly concerned with Psychrometry?

1. Lewis relationship
2. Galileo number
3. Weber number
4. Dean number

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