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_________________?

Related Mcqs:

1. 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

2. 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

3. Angle of nip of the crushing rolls does not depend upon the_______________?

   A. Diameter of the rolls
   B. Speed of the rolls
   C. Product size
   D. Feed size

4. 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

5. 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

6. 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

7. 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°

8. 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

9. Rittinger’s crushing law states that_____________________?

   A. Work required to form a particle of any size is proportional to the square of the surface to
   volume ratio of the product
   B. Work required to form a particle of a particular size is proportional to the square root of the
   surface to volume ratio of the product
   C. Work required in crushing is proportional to the new surface created
   D. For a given machine and feed, crushing efficiency is dependent on the size of the feed &
   product

10. According to Bond crushing law, the work required to form particle of size ‘D’ from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively) ?

    A. (S/V)p
    B. √(S/V)p
    C. (S/V)2p
    D. (S/V)f