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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17.
For flow of gas through a capillary according to Poiseuilles law the permeability

Varies inversely as the gas viscosity

Is proportional to the gas viscosity

Varies as the square root of gas viscosity

Varies as the square of the gas viscosity

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18.
For flow of a gas through a given capillary according to Poiseuilles law the permeability

Remains unaffected with change in temperature

Increases with increase in temperature

Decreases with increase in temperature

Varies as the square root of temperature

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19.
The permeability increases with increase in temperature for the flow of gases through a capillary according to

Knudsen law

Poiseuilles law

Both Knudsen law and Poiseuilles law

None of the above

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21.
The diffusivity has the same dimensions as

Absolute viscosity

Kinematic viscosity

Density

Concentration

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22.
The Schmidt number (NSc) is the ratio of

The momentum diffusivity to the mass diffusivity

The mass diffusivity to the momentum diffusivity

The thermal diffusivity to the mass diffusivity

The momentum diffusivity to the thermal diffusivity

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27.
The eddy momentum diffusivity the thermal diffusivity and the mass diffusivity will be the same for

NPr = NSc = 0.7

NPr = NSc = 1

NPr = NSc = 7.02

NPr = NSc = 297

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28.
The temperature at which a vapour-gas mixture becomes saturated when cooled at constant total pressure out of contact with a liquid is called

Bubble point

Dew point

Wet-bulb temperature

Dry-bulb temperature

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29.
The dew point of an unsaturated mixture of vapour and gas does not depend on

The temperature of the mixture

The total pressure of the mixture

The composition of the mixture

All of the above

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30.
The relative saturation of an unsaturated mixture of vapour and gas

Is always equal to its percentage saturation

Is always lower than its percentage saturation

Is always greater than its percentage saturation

May be smaller or greater than its percentage saturation depending on the composition of the mixture

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