Colloidal mills are used for ______________ grinding?
Colloidal mills are used for ______________ grinding?
A. Coarse
B. Intermediate
C. Fine
D. Ultrafine
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The reduction ratio for fine grinders is_____________?
The reduction ratio for fine grinders is_____________?A. 5-10
B. 10-20
C. 20-40
D. As high as 100Run of mine (ROM) coal is crushed by a _________________________ for use in domestic ovens?
Run of mine (ROM) coal is crushed by a _________________________ for use in domestic ovens?A. Jaw crusher
B. Hammer crusher
C. Ball mill
D. Tube millWork 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 micronsThe constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond’s law, Rittinger’s law and Kick’s law) depend upon the_________________?
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond’s law, Rittinger’s law and Kick’s law) depend upon the_________________?A. Feed material
B. Type of crushing machine
C. Both A. & B.
D. Neither A. nor B.A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?A. 0.50
B. 0.58
C. 0.68
D. 0.62Tube mill compared to ball mill_______________________?
Tube mill compared to ball mill_______________________?A. Produces finer products
B. Is long in comparison with its diameter
C. Uses smaller balls
D. All A., B. & C.