Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?

Related Mcqs:

1. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?

   A. Jet mills
   B. Fluid energy mill
   C. Micronizer
   D. All A., B. and C.

2. 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

3. Feed size of ≥ 25 cms can be accepted by _______________________?

   A. Ball mill
   B. Rod mill
   C. Fluid energy mill
   D. Jaw crusher

4. Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding?

   A. 1.0
   B. 0.5
   C. 1.34
   D. 4.34

5. 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

6. What is the reduction ratio in a fine crushing operation having following feed and product sizes ?

   A. 0.5
   B. 2
   C. 5
   D. 10

7. Which of the following achieves the least reduction ratio for a given feed size ?

   A. Jaw crusher
   B. Roll crusher
   C. Cone crusher
   D. Gyratory crusher

8. During size reduction by a jaw crusher, the energy consumed decreases with the__________________?

   A. Decreasing size of product at constant size of feed
   B. Decreasing machine capacity
   C. Increasing size of feed at constant reduction ratio
   D. None of these

9. 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

10. The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?

    A. Df/Dp
    B. Dp/Df
    C. Df – Dp
    D. None of these