Related Questions

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
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
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A 0
B 100
C 50
D None of these
__________ mill is not a revolving mill.
A Pebble
B Compartment
C Cage
D Tube
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
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
Which of the following is not a revolving/tumbling mill used for size reduction?
A Compartment mill
B Pebble mill
C Cage mill
D Rod mill

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