Mass Transfer
Which of the following equipments is not used for gas dispersion?

Bubble cap tray towers
Spray towers
Agitated vessels
Perforated sieve tray towers

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Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%
Rotary dryer is suitable for drying sticky material
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

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Mass Transfer
Inside the distillation column, the

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

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