A. Impact
B. Roll
C. Vibratory
D. None of these
Related Mcqs:
- 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 - What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
A. 16°
B. 32°
C. 40°
D. 46° - ______________ mill is not a revolving mill ?
A. Pebble
B. Compartment
C. Cage
D. Tube - For achieving maximum capacity of the ball mill, the ball charge should be equal to about ______________ percent of the ball mill volume?
A. 10
B. 25
C. 50
D. 75 - Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles) ?
A. m/ρ . Vp
B. m . ρ/Vp
C. m . Vp/ρ
D. Vp/m . ρ - In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?
A. Secondary
B. Fine
C. Primary
D. Ultrafine - 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. Ultrafine - General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?
A. 1
B. 1.5
C. 2
D. 2.5 - In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of _______________ crushing?
A. Primary
B. Secondary
C. Fine
D. Ultrafine - For crushing of solids, the Rittinger’s law states that the work required for crushing is proportional to __________________?
A. The new surface created
B. The size reduction ratio
C. The change in volume due to crushing
D. None of these
