The main size reduction operation in ultrafine grinders is

Ultrafine grinders operate principally by

A

Slow compression

B

Impact

C

Attrition

D

Cutting action

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?

A

Jet mills

B

Fluid energy mill

C

Micronizer

D

All of the above

The reduction ratio for fine grinders is

A

5-10

B

10-20

C

20-40

D

As high as 100

Size measurement of ultrafine particles can be best expressed in terms of

A

Centimetre

B

Screen size

C

Micron

D

Surface area per unit mass

Temperature of the product during ultrafine grinding

A

Increases

B

Decreases

C

Remains constant

D

May increase or decrease ; depends on the material being ground

For the transportation of ultrafine particles, the equipment used is a........conveyor.

A

Belt

B

Pneumatic

C

Screw

D

None of these

To get ultrafine particles, the equipment used is a

A

Ball mill

B

Rod mill

C

Hammer crusher

D

Fluid energy mill

Which of the following is not an ultrafine grinder (colloid mill)?

A

Micronizers

B

Agitated mills and fluid energy mills

C

Toothed roll crusher

D

Hammer mills with internal classification

In centre less grinders, the maximum angular adjustment of the regulating wheel is

A

5°

B

10°

C

15°

D

20°

In centerless grinders, the regulating wheel is inclined at

A

0° to 8°

B

9° to 15°

C

16° to 20°

D

21° to 25°

The main size reduction operation in ultrafine grinders is

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