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A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.
A Compartment
B Tube
C Rod
D Pebble
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 D2.5
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
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be
A 0.5 Wi
B Wi
C 1.34 Wi
D 3.34 Wi
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
Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.
A Turning
B Dressing
C Forming
D Surface finishing
Wet grinding in a revolving mill __________ as compared to dry grinding.
A Gives less wear on chamber walls
B Requires more energy
C Increases capacity
D Complicates handling of the product
In case of a revolving mill, wet grinding compared to dry grinding
A Requires more energy
B Has less capacity
C Complicates handling & classification of the product
D None of these
In closed circuit grinding as compared to open circuit grinding, the
A Specific surface of product is more
B Product has lesser size uniformity
C Production rate at a given limiting size is lower
D Operation is economical
In case of grinding in a ball mill
A Wet grinding achieves a finer product size than dry grinding
B Its capacity decreases with increasing fineness of the products
C Grinding cost and power requirement increases with increasing fineness of the products
D All of the above

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