Screening

Question 1

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

Answer 1

Screening

Question 2

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

Answer 2

Dry Screening

Question 3

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

Answer 3

Wet Screening

Question 4

Number of openings per linear inch.

Answer 4

Mesh

Question 5

Screen opening

Answer 5

Aperture

Question 6

Percentage of actual openings versus total screen area

Answer 6

Open Area

Question 7

Material that does not pass through the screen

Answer 7

Oversize

Question 8

Materials that passes through the screen

Answer 8

Undersize

Question 9

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

Answer 9

Intermediate

Question 10

Intermediates with known upper limit or lower limit diameter

Answer 10

Sized fractions

Question 11

A part with only a known upper limit or lower limit

Answer 11

Unsized fractions

Question 12

Relationship between successive sizes

Answer 12

Screen Interval

Question 13

Series of testing sieves

Answer 13

Sieve Scale

Question 14

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

Answer 14

Testing sieves

Question 15

Removal of small amount of oversize

Answer 15

Scalping

Question 16

Separation for particles with sizes of 4 mesh or larger

Answer 16

Coarse Separation

Question 17

Separation for particles with sizes smaller than 4 mesh but larger than 48 mesh

Answer 17

Fine Separation

Question 18

For particles with sizes smaller than 46 mesh

Answer 18

Ultrafine Separation

Question 19

Set of parallel bars separated by spacers at end; for large particles, particularly 1 inch over

Answer 19

Grizzly Screens

Question 20

Used if large capacity and high efficiency are desired; for fine sizing

Answer 20

Vibrating Screens

Question 21

Used for light free flowing materials

Answer 21

Oscillating Screens

Question 22

Used to handle dry, light or bulky materials, light metal powders, powdered foods, and granular materials; not for heavy materials like rocks or gravel

Answer 22

Recprocating Screens

Question 23

Consist of rotating cylinder of perforated sheet material or wire screen; low capacity and efficiency

Answer 23

Trommels or Revolving Screens

Question 24

Used in flour milling industry and for some light, dry and non-abrasive materials

Answer 24

Reels

Question 25

Gives reciprocating motion; high cost maintenance and low capacity

Answer 25

Mechanical Shaking Screens

Question 26

Gives auxiliary vibration caused by bouncing ball against screen

Answer 26

Gyratory Screens