Mass Transfer

561.Which is the controlling factor for a drum drier?

1. Diffusion
2. Heat transfer
3. Both (A) and (B)
4. Neither (A) nor (B)

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562.Which of the following adsorbent is used in the refining of sugar?

1. Bone charcoal
2. Wood charcoal
3. Silica gel
4. Activated clay

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563.Which of the following adsorbent is used to decolourise yellow glycerine?

1. Silica gel
2. Alumina
3. Fuller's earth
4. Activated carbon

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564.Which of the following assumes constant molal vaporisation and overflow?

1. McCabe-Thiele method
2. Ponchan-Savarit method
3. Enthalpy concentration method
4. Plate absorption column

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565.Which of the following binary systems is an example of a maximum boiling azeotrope?

1. Water-hydrochloric acid
2. Acetone-carbon disulphide
3. Water-ethyl alcohol
4. n-heptane-n-octane

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566.Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?

1. Dew point
2. Humidity ratio
3. Wet bulb temperature
4. None of these

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567.Which of the following decreases during evaporative cooling process with recirculated water supply?

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

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568.Which of the following employs an accessory known as 'drift eliminator'?

1. Multiple effect evaporator
2. Mechanical draft cooling tower
3. Rotary dryer
4. Rotating disc contactor

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569.Which of the following equipments is not used for gas dispersion?

1. Agitated vessels
2. Bubble cap tray towers
3. Perforated sieve tray towers
4. Spray towers

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570.Which of the following equipments is not used for liquid dispersion?

1. Wetted wall towers
2. Packed towers
3. Venturi scrubbers
4. Agitated vessels

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