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ChE Objectives > Day 2 Random > Flashcards

Day 2 Random Flashcards

1
Q

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

A

Aqueous NaOH

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2
Q

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

A

R^4

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3
Q

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.

A

Humidification

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4
Q

This dimensionless number relates buoyancy forces to viscous forces.

A

Grashof Number

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5
Q

Pipes having diameter 14 inches or more are designated by their

A

Outside Diamater

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6
Q

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

A

Screening

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7
Q

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

A

Dry Screening

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8
Q

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

A

Wet Screening

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9
Q

Number of openings per linear inch.

A

Mesh

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10
Q

Screen opening

A

Aperture

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11
Q

Percentage of actual openings versus total screen area

A

Open Area

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12
Q

Material that does not pass through the screen

A

Oversize

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13
Q

Materials that passes through the screen

A

Undersize

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14
Q

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

A

Intermediate

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15
Q

Intermediates with known upper limit or lower limit diameter

A

Sized fractions

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16
Q

A part with only a known upper limit or lower limit

A

Unsized fractions

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17
Q

Relationship between successive sizes

A

Screen Interval

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18
Q

Series of testing sieves

A

Sieve Scale

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19
Q

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

A

Testing sieves

20
Q

Removal of small amount of oversize

A

Scalping

21
Q

Separation for particles with sizes of 4 mesh or larger

A

Coarse Separation

22
Q

Impacts to power consumption and wear machine

A

Hardness

23
Q

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

A

Structure

24
Q

Tendency of material to fracture

A

Friability

25
Q

Measure of friction coefficient of the material

A

Soapiness

26
Q

Handled via wet grinding or with an inert material

A

Explosive Material

27
Q

Particle size from 2 to 96 inches or more

A

Coarse

28
Q

Particle size from 1 to 3 inches

A

Intermediate

29
Q

Particle size from 0.25 to 0.5 inches

A

Fine

30
Q

For reduction of fibrous materials

A

Disintegration

31
Q

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

A

Attrition or Rubbing

32
Q

Produces definite size and shape, few or almost no fines

A

Cutting

33
Q

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

A

Aerosols

34
Q

In water chemical treatment plant, use of chloramines ensures

A

Disinfection

35
Q

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

A

SO2

36
Q

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

A

Idle running

37
Q

H2S present in gaseous stream can be removed by adsorption on

A

Bog Iron

38
Q

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.

A

5

39
Q

Main pollutants released from iron & steel industry is

A

CO, CO2 and SO2

40
Q

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

A

Iron

41
Q

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

A

treating in biological oxygen pond

42
Q

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

A

30 to 70 kV DC

43
Q

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

A

caustic embrittlement

44
Q

80% less than 200 mesh size particles are called

A

Powder

45
Q

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

A

0.1

ChE Objectives (3 decks)

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