Tube mill compared to ball mill

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

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

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

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

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

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A

More

B

Less

C

Equal

D

None of these

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

A

More heating surface

B

Less heating surface

C

Equal heating surface

D

Heating surface depends on other parameters

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

A ball and a bat costs 110 taka. The bat costs 100 taka more than the ball. How much does the ball cost ?

A

5

B

10

C

15

D

100

Tube mill compared to ball mill

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