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

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

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

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

Solution Y is 40 percent sugar by volume and solution X is 20 percent sugar by volume. how many gallons of solution that is 25 percent sugar by volume/

A

75

B

150

C

240

D

450

Solution X is 10% percent alcohol by volume, and solution Y is 30 percent alcohol by volume. How many milliliters of solution Y must be added to 200 milliliters of solution X to create a solution that is 25 percent alcohol by volume?

A

600

B

800

C

300

D

250

E

None of these

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

Grinding efficiency of a ball mill is of the order of __________ percent.

A

1-5

B

40-50

C

75-80

D

90-95

An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.

A

5

B

15

C

40

D

60

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

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