Gravity stamp mill is meant for the ___________________ crushing?
Gravity stamp mill is meant for the ___________________ crushing?
A. Primary
B. Intermediate
C. Fine
D. Ultrafine
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Size reduction of moulding powders, waxes, resins & gums are done in a _______________ mill?
Size reduction of moulding powders, waxes, resins & gums are done in a _______________ mill?A. Cage
B. Hammer
C. Both A. & B.
D. Neither A. nor B.Mass flow of granular solid (M) through a circular opening of dia, D follows_____________________?
Mass flow of granular solid (M) through a circular opening of dia, D follows_____________________?A. M ∝ √D
B. M ∝ D2
C. M ∝ D3
D. M ∝ DWork index is defined as the_________________?
Work index is defined as the_________________?A. Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of
the product passes through a 100 micron screen
B. Energy needed to crush one tonne of feed to 200 microns
C. Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product
passes a 200 mesh screen
D. Energy needed to crush one ton of feed to 100 micronsSizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?A. Clarification
B. Sedimentation
C. Flocculation
D. ClassificationPick out the material having minimum Rittinger’s number?
Pick out the material having minimum Rittinger’s number?A. Calcite
B. Pyrite
C. Quartz
D. GalenaWhich 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 mill