Mass Transfer Mcqs

This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Mass Transfer ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Mass Transfer comprehensively.

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31.
The relative saturation of an unsaturated mixture of vapour and gas depends on

The composition of the mixture

The temperature of the mixture

The nature of the vapour

All of the above

32.
For a vapour-gas mixture the wet and dry-bulb temperature are 20?C and 35?C respectively if the mixture is heated to 50?C at constant pressure the wet bulb temperature will be

20?C

>20?C

<20?C

? 20?C

33.
At the boiling point of the liquid at the prevailing pressure the saturated absolute humidity becomes

One

Zero

Infinity

None of the above

34.
The dew point of an unsaturated mixture of water vapour and air at constant temperature and pressure

Does not change with change in absolute humidity

Increases with increase in absolute humidity

Decreases with increase in absolute humidity

Decreases linearily with increase in absolute humidity.

35.
The steady-state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called

Dry-bulb temperature

Dew point

Wet-bulb temperature

Bubble point

36.
For any vapour-gas mixture the adiabatic saturation curve is

Straight line

Slightly concave upward

Slightly concave downward

B

40.
The lewis number of a mixture is one when mass diffusivity is equal to

Momentum diffusivity

Thermal diffusivity

Thermal conductivity

1/thermal diffusivity

43.
The temperature of water cooled in a cooling tower is

Always less than the wet-bulb temperature of entering air

Always equal to the wet-bulb temperature of entering air

Always greater than the wet-bulb temperature of entering air

Always equal to the dry-bulb temperature of entering air.

44.
In the design of cooling towers the wet-bulb temperature approach is ordinarily specified to be

From 5 to 10?F

From 20 to 30?F

From 30 to 35?F

From 10 to 25?F

45.
In a cooling tower makeup fresh water must be added to replace losses from

Entrainment

Evaporation losses

Blowdown

All of the above

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