Day 2 Random Flashcards
The solvent use for absorbing carbon dioxide for gas absorption is___.
Aqueous NaOH
For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poiseuille equation predict the volumetric flowrate to be proportional to
R^4
Many mass-transfer operations involve the diffusion of one gas component through another non-diffusing component; absorption and _______ are typical operations defined by these equations.
Humidification
This dimensionless number relates buoyancy forces to viscous forces.
Grashof Number
Pipes having diameter 14 inches or more are designated by their
Outside Diamater
Separation of a mixture of particles into two or more portions with more uniform size.
Screening
Materials screened contains the natural moisture; it is dried prior to screening.
Dry Screening
Water is added to the mixture to aid washing of fine particles.
Wet Screening
Number of openings per linear inch.
Mesh
Screen opening
Aperture
Percentage of actual openings versus total screen area
Open Area
Material that does not pass through the screen
Oversize
Materials that passes through the screen
Undersize
For two or more screens; material passing thru one screen and retained on subsequent surface
Intermediate
Intermediates with known upper limit or lower limit diameter
Sized fractions
A part with only a known upper limit or lower limit
Unsized fractions
Relationship between successive sizes
Screen Interval
Series of testing sieves
Sieve Scale
Used to determine efficiency of screening devices; made of woven wire screens
Testing sieves
Removal of small amount of oversize
Scalping
Separation for particles with sizes of 4 mesh or larger
Coarse Separation
Impacts to power consumption and wear machine
Hardness
Normal force acts for granular materials, tearing action for fibrous materials
Structure
Tendency of material to fracture
Friability
Measure of friction coefficient of the material
Soapiness
Handled via wet grinding or with an inert material
Explosive Material
Particle size from 2 to 96 inches or more
Coarse
Particle size from 1 to 3 inches
Intermediate
Particle size from 0.25 to 0.5 inches
Fine
For reduction of fibrous materials
Disintegration
Results to very few fines from soft and non-abrasive materials
Attrition or Rubbing
Produces definite size and shape, few or almost no fines
Cutting
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
Aerosols
In water chemical treatment plant, use of chloramines ensures
Disinfection
Common pollutant emitted from metallurgical smelters, thermal power plant and cement plants
SO2
Operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum
Idle running
H2S present in gaseous stream can be removed by adsorption on
Bog Iron
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.
5
Main pollutants released from iron & steel industry is
CO, CO2 and SO2
Siderosis is a disease caused by the inhalation of __________ dust.
Iron
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
treating in biological oxygen pond
Ionisation potential employed in the industrial electrostatic precipitator is of the order of
30 to 70 kV DC
Tri-sodium phosphate is used in boiler water treatment to reduce
caustic embrittlement
80% less than 200 mesh size particles are called
Powder
TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.
0.1
