Day 2 Random

Question 1

The solvent use for absorbing carbon dioxide for gas absorption is___.

Answer 1

Aqueous NaOH

Question 2

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

Answer 2

R^4

Question 3

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.

Answer 3

Humidification

Question 4

This dimensionless number relates buoyancy forces to viscous forces.

Answer 4

Grashof Number

Question 5

Pipes having diameter 14 inches or more are designated by their

Answer 5

Outside Diamater

Question 6

Separation of a mixture of particles into two or more portions with more uniform size.

Answer 6

Screening

Question 7

Materials screened contains the natural moisture; it is dried prior to screening.

Answer 7

Dry Screening

Question 8

Water is added to the mixture to aid washing of fine particles.

Answer 8

Wet Screening

Question 9

Number of openings per linear inch.

Answer 9

Mesh

Question 10

Screen opening

Answer 10

Aperture

Question 11

Percentage of actual openings versus total screen area

Answer 11

Open Area

Question 12

Material that does not pass through the screen

Answer 12

Oversize

Question 13

Materials that passes through the screen

Answer 13

Undersize

Question 14

For two or more screens; material passing thru one screen and retained on subsequent surface

Answer 14

Intermediate

Question 15

Intermediates with known upper limit or lower limit diameter

Answer 15

Sized fractions

Question 16

A part with only a known upper limit or lower limit

Answer 16

Unsized fractions

Question 17

Relationship between successive sizes

Answer 17

Screen Interval

Question 18

Series of testing sieves

Answer 18

Sieve Scale

Question 19

Used to determine efficiency of screening devices; made of woven wire screens

Answer 19

Testing sieves

Question 20

Removal of small amount of oversize

Answer 20

Scalping

Question 21

Separation for particles with sizes of 4 mesh or larger

Answer 21

Coarse Separation

Question 22

Impacts to power consumption and wear machine

Answer 22

Hardness

Question 23

Normal force acts for granular materials, tearing action for fibrous materials

Answer 23

Structure

Question 24

Tendency of material to fracture

Answer 24

Friability

Question 25

Measure of friction coefficient of the material

Answer 25

Soapiness

Question 26

Handled via wet grinding or with an inert material

Answer 26

Explosive Material

Question 27

Particle size from 2 to 96 inches or more

Answer 27

Coarse

Question 28

Particle size from 1 to 3 inches

Answer 28

Intermediate

Question 29

Particle size from 0.25 to 0.5 inches

Answer 29

Fine

Question 30

For reduction of fibrous materials

Answer 30

Disintegration

Question 31

Results to very few fines from soft and non-abrasive materials

Answer 31

Attrition or Rubbing

Question 32

Produces definite size and shape, few or almost no fines

Answer 32

Cutting

Question 33

Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

Answer 33

Aerosols

Question 34

In water chemical treatment plant, use of chloramines ensures

Answer 34

Disinfection

Question 35

Common pollutant emitted from metallurgical smelters, thermal power plant and cement plants

Answer 35

SO2

Question 36

Operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum

Answer 36

Idle running

Question 37

H2S present in gaseous stream can be removed by adsorption on

Answer 37

Bog Iron

Question 38

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.

Answer 38

5

Question 39

Main pollutants released from iron & steel industry is

Answer 39

CO, CO2 and SO2

Question 40

Siderosis is a disease caused by the inhalation of __________ dust.

Answer 40

Iron

Question 41

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

Answer 41

treating in biological oxygen pond

Question 42

Ionisation potential employed in the industrial electrostatic precipitator is of the order of

Answer 42

30 to 70 kV DC

Question 43

Tri-sodium phosphate is used in boiler water treatment to reduce

Answer 43

caustic embrittlement

Question 44

80% less than 200 mesh size particles are called

Answer 44

Powder

Question 45

TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.

Answer 45

0.1