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.
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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20. The binary diffusivity in liquids varies almost as
T
T 3/2
T 2
T3
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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23. The Schmidt number (NSc) is defined as
?/DAB
?/?DAB
??/DAB
?DAB/?
24. For water at 20?C the Prandtl number (NPr) is
0.702
7.02
70.2
120
25. Peclet number (NPe) for mass transfer is defined as
NRe/NSc
NReNSc
NSc/NRe
NShNSc
26. Stanton number (NSt) for mass transfer is defined as
NSh/NReNSc)
NPeNSh
NSh/NSc
NShNSc
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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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