Maximum size reduction in a ball mill is done by the, __________ action.

For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.

A

10

B

25

C

50

D

75

Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

A

D

B

$$\frac{1}{{\text{D}}}$$

C

D^2.5

D

$$\frac{1}{{{{\text{D}}^{2.5}}}}$$

In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

A

35

B

50

C

70

D

85

The main differentiation factor between tube mill and ball mill is the

A

Length to diameter ratio

B

Size of the grinding media

C

Final product size

D

Operating speed

Tube mill compared to ball mill

A

Produces finer products

B

Is long in comparison with its diameter

C

Uses smaller balls

D

All of the above

A tube mill compared to a ball mill

A

Has a higher length/diameter ratio

B

Produces a coarser product

C

Has a higher diameter/length ratio

D

Uses much larger balls

A tube mill as compared to a ball mill

A

Employs smaller balls

B

Gives finer size reduction but consumes more power

C

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)

D

All of the above

Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

A

Metalliferrous ores

B

Non-metallic ores

C

Basic slags

D

Asbestos & mica

Maximum size reduction in a fluid energy mill is achieved by

A

Compression

B

Interparticle attrition

C

Cutting

D

Impact

When the weight of a ball inside the ball mill is just balanced by the centrifugal force,

A

The ball abandons its circular path for a parabolic path

B

The ball abandans its parabolic path for a circular path

C

The ball continues to move on a circular path

D

The ball continues to move on a parabolic path

Maximum size reduction in a ball mill is done by the, __________ action.

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