Day 2 MRII Flashcards
A Vapor whose partial pressure is greater than its equilibrium vapor pressure at a given temperature is called
Superheated Vapor
This is a steady-state temperature reached by a small amount of gas immersed in a large body of liquid under adiabatic conditions
Saturation Temperature
Shape factor for a cylinder whose length equals its diameter is
1.5
the Material passing one screening surface and retained on a subsequent surface is called
intermediate material
In membrane separation process, an asymmetric membrane refers to
a composite polymer and porous membrane
With the rise of temperature, the thermal conductivity of solid metals normally (decreases/remain constant/increases)
Decreases
At very low velocities of small particles in a fluid, ______ causes the wall shear
Viscosity
For aqueous Solution, the most important variable in natural-circulation evaporation is
Viscosity
Leg support is meant for _______ vessels
small
A major byproduct in the Hall electrometallurgical process for refining aluminum is
CO2 (g) from oxidation of the graphite anode
Temperature differences in natural convection causes the fluid of different regions to have varying
Density
If momentum transfer is analogous to conductive heat transfer resulting from a temperature gradient, where the thermal conductivity is the proportionality factor between heat flux and temperature gradient, what then is the proportionality factor between momentum flux and velocity gradient?
Viscosity
Bayer Process for purifying bauxite relies upon the
Amphoteric nature of Al3+
When the molal latent heat of vaporization of the binary system is very much dependent on concentration, the most appropriate method to use to determine the number of ideal stages is
Ponchon-Savarit Method
It is caused by the transfer from higher concentration to low concentration region
Molecular Diffusion
Which among the following is not transparent to gas radiation
Oxygen
Air
Water Vapor
Helium
Water Vapor
The controlling resistance in a rotary drum vacuum filter is the ________ resistance
Cake
In filtration, the finer the filtration medium is (the shorter/longer/does not affect) the constant rate period
the longer is
A gaseous fuel in order to develop luminosity on burning must contain ______
Hydrocarbons
The measure of the relative effectiveness of momentum and energy transport by diffusion in the velocity and thermal boundary layers is given by
Prandtl Number
While starting a centrifugal pump, its delivery valve should be kept _____
closed
The diameter of Raschig rings used in a packed tower in industry is normally around
2”
The transport analogy among mass, heat, and momentum transfer is complete when
no convection flux or phase drift is involved
The product of the two dimensionless group Nre and Npr is commonly called
Peclet Number
Unbound moisture in granular and porous solid, moved through the interstices of the solid by a mechanism involving
Moisture diffusivity
In terms of heat transfer, the use of a cooling yower is said to be more efficient and more economicsl compated to an ordinary heat exchanger since __________
temperature profiles of air and water can cross each other
The ratio of internal resistance of a solid to the boundary layer thermal resistance is described by
Biot Number
The ratio of Buoyancy forces to viscous forces
Grashof Number
The line of action of the buoyant force passes through the center of gravity of the
displaced volume of the fluid
A dimensionless number representing the ratio of heatbttansfer by motion of a fluid to heay transfer by thermal conduction
Peclet Number
For sizing fine materials, the most suitable equipment is
Vibrating screen
States that if two models ste geometrically, kinematically, and dynamicallu similar, all velocities and forces are in constant relationship at counterpart positions
Dimensional Theory
A conveyor auxiliary device used to cut out the driving force when a belt conveyor jams
Cleaner
