Mass Transfer
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature.

Dew point
None of these
Wet bulb
Dry bulb

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Hot water entering and the cooled water leaving the cooling tower
Cold water leaving the tower and the wet bulb temperature of the surrounding air
None of these
Hot water entering the tower and the wet bulb temperature of the surrounding air

ANSWER DOWNLOAD EXAMIANS APP

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

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.
Rotary dryer is suitable for drying sticky material
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%

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

The top and bottom compositions correspond to the maximum enrichment available
Composition of vapors and that of liquid do not vary throughout the column
The top and bottom compositions are unchanged with and without total reflux
Reboiler load and condenser load are minimum

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Plate efficiency

Is a function of the mass transfer between liquid and vapour
Increases due to foaming
Increases due to weeping and dumping of liquid
Increases due to liquid entrainment

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Mass Transfer