FINAL 04 - Micromeritics

Question 1

Science and technology of small particles

Answer 1

Micromeritics

Question 2

Any unit of matter having defined physical dimensions

Answer 2

Particle

Question 3

Expressed in diameter

Answer 3

Particle size

Question 4

An estimate of the size range present and the number or weight fraction of each particle size

Answer 4

Particle size distribution

Question 5

For particles > 1 μm; use calibrated stage and ocular micrometers

Answer 5

Optical microscopy

Question 6

Measurement of the distance between tangents parallel to some fixed direction

Answer 6

Feret diameter

Question 7

Diameter of a circle with the same area as that of the particle observed perpendicular to the surface on which the particle rests

Answer 7

Projected area diameter

Question 8

Taken as the length of a line that bisects a particle

Answer 8

Martin diameter

Question 9

Method of choice for classification of the coarser grades of single powders or granules

Answer 9

Sieving

Question 10

Special cylindrical container designed such that a sample can be removed from the lower portion at selected time intervals

Answer 10

Adreasen apparatus

Question 11

Coulter counter (Principle involved)

Answer 11

Electronic resistance

Question 12

HIAV/Royco Light Blockage Instrument (Principle involved)

Answer 12

Light blockage

Question 13

Beckman Coulter Model (Principle involved)

Answer 13

Photon correlation spectroscopy

Question 14

Micro-computerized Mercury Porosimetry (Principle involved)

Answer 14

Adsorption

Question 15

German Counter (Principle involved)

Answer 15

Faraday-Tyndall effect (Light scattering)

Question 16

Measure of the total voids present in a particle

Answer 16

Porosity

Question 17

Closest or rhombohedral (Theoretical porosity)

Answer 17

26%

Question 18

Most open, loosest, or cubic packing (Theoretical porisity)

Answer 18

48%

Question 19

Ordinary powders (Theoretical porosity)

Answer 19

30-50%

Question 20

Flocculated powders (Theoretical porosity)

Answer 20

> 48%

Question 21

Crystalline materials (Theoretical porisity)

Answer 21

<1%

Question 22

Density exclusive of the voids and intraparticle pores larger than molecular or atomic dimensions in the crystal lattices

Answer 22

True density

Question 23

Density determined by the displacement of Hg

Answer 23

Granule density

Question 24

Measure of interparticulate interactions

Answer 24

Bulk density

Question 25

Achieved by mechanically tapping a measuring cylinder containing a powder sample

Answer 25

Tapped density

Question 26

Refers to specific bulk volume; reciprocal of bulk density

Answer 26

Bulkiness

Question 27

Powder flow measurement related to interparticulate friction or resistance to movement between particles

Answer 27

Angle of repose

Question 28

Generally measured as the mass per time flowing from any of a number of types of containers

Answer 28

Flow through an orfice

Question 29

Very course particle (Sieve no.)

Answer 29

8

Question 30

Coarse particle (Sieve no.)

Answer 30

20

Question 31

Moderately course (Sieve no.)

Answer 31

40

Question 32

Fine particle (Sieve no.)

Answer 32

60

Question 33

Very fine particle (Sieve no.)

Answer 33

80