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The Medicine (Y2) > Comminution > Flashcards

Comminution Flashcards

1
Q

Particle size influences bioavailability - a smaller particle size results in faster dissolution. True or false?

A

True

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2
Q

What is meant by comminution?

A

The reduction of solid materials from a bigger mean particle size to a smaller mean particle size

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3
Q

The efficiency of a conventional ball mill is greater than that of a vibratory mill. True or false?

A

False - vibratory mill more efficient

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4
Q

Dry sieving is usually more efficient than wet sieving. True or false?

A

False - wet sieving is more efficient

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5
Q

Which milling method is defined as self-classifying?

A

Cutter mill

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6
Q

Separation efficiency is the effectiveness of a given process in separating particles into oversized and undersized fractions. True or false?

A

True

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7
Q

How many micrometres is a coarse powder?

A

> 350

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8
Q

How many micrometres is a medium/fine powder?

A

100-350

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9
Q

How many micrometres is a fine powder?

A

50-100

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10
Q

How many micrometres is a very fine powder?

A

10-50

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11
Q

How many micrometres is a micronised powder?

A

<10

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12
Q

The sieve method is simpler and more cost effective than microscopy. True or false?

A

True

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13
Q

The sieve method provides particle shape information. True or false?

A

False

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14
Q

Which particle size analysis method sorts a large quantity of particles into different size ranges and determines the particle size distribution based on the mass collected in each range?

A

Sieve method

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15
Q

Mohs’ scale is a quantitative measure of hardness. True or false?

A

False - qualitative

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16
Q

Brinell or vickers is a quantitative measure of hardness true or false?

A

True

17
Q

Which milling method achieves a particles size of 1-300 micrometres?

A

Attrition

18
Q

Which milling method achieves a particles size of 100-100,000 micrometres?

A

Cutting

19
Q

What particle size can a ball mill achieve?

A

1-200 micrometres

20
Q

Which milling method achieves a particles size of 20-100,00 mircometres?

A

End runner

21
Q

Which milling method achieves a particle size of 1-1000 micrometres?

A

Vibration

22
Q

Which milling method achieves a particle size of 600-200,000 micrometres?

A

Roller

23
Q

What particle size can a fluid energy mill achieve?

A

1-100,000 micrometres

24
Q

Which milling method achieves a particle size of 10-9,000 micrometres?

A

Pin mill

25
Q

What particle size does a hammer mill achieve?

A

30 - 10,000 micrometres

The Medicine (Y2) (34 decks)

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