Which of the following is not a non-metalliferous mineral ?
Which of the following is not a non-metalliferous mineral ?
A. Calcite
B. Fluorspar
C. Quartz
D. Cassiterite
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A belt conveyor used for the transportation of materials can___________________?
A belt conveyor used for the transportation of materials can___________________?A. Run upto 1 km
B. Travel at a speed upto 300 metres/minute
C. Handle materials upto 5000 tons/hr
D. All A., B. and C.In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?
In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?A. Primary
B. Secondary
C. Fine
D. UltrafineTemperature of the product during ultrafine grinding_____________________?
Temperature of the product during ultrafine grinding_____________________?A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on the material being groundFor a non-spherical particle, the sphericity__________________?
For a non-spherical particle, the sphericity__________________?A. Is defined as the ratio of surface area of a sphere having the same volume as the particle to the
actual surface area of the particle
B. Has the dimension of length
C. Is always less than 1
D. Is the ratio of volume of a sphere having the same surface area as the particle to the actual
volume of the particleWhich of the following is not a revolving/tumbling mill used for size reduction ?
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 millRittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?
Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?A. State or manner of application of the crushing force
B. Ultimate strength of the material
C. Elastic constant of the material
D. All A., B. and C.