A. Toothed roll crusher
B. Gyratory crusher
C. Ball mill
D. Tube mill
Related Mcqs:
- Hot, lumpy & abrasive materials are best transported by using a/an ___________ conveyor ?
A. Apron
B. Belt
C. Screw
D. Flight - 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 - 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° - 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 - Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
A. Bond’s crushing law
B. Kick’s law
C. Rittinger’s law
D. None of these - Which of the following gives the crushing energy required to create new surface ?
A. Taggarts rule
B. Fick’s law
C. Rittinger’s Law
D. None of these - Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?
A. P/m = K/ √Dp
B. P/m = K . ln D̅ sa/D̅ sb
C. P/m = K . (1/ D̅ sb – 1/D̅ sa)
D. None of these
