_____________________ baffles are provided in ball mills ?
_____________________ baffles are provided in ball mills ?
A. Horizontal
B. No
C. Only two
D. None of these
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In case of a revolving mill, wet grinding compared to dry grinding__________________?
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 theseTwo particles are called to be equal settling, if they are having the same ?
Two particles are called to be equal settling, if they are having the same ?A. Size
B. Specific gravity
C. Terminal velocities in the same fluid & in the same field of force
D. None of theseWashability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?A. Density separation
B. Differential wettability
C. Size
D. Volatile matter contentRittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?
Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?A. Easier grindability
B. Poor grindability
C. High power consumption in grinding
D. None of theseTrommels employ _____________ for screening of materials?
Trommels employ _____________ for screening of materials?A. Fibrous cloth
B. Woven wire screen
C. Punched plate
D. None of theseWhich of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?A. Rittinger’s law
B. Kick’s law
C. Bond’s law
D. None of these