Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?

Related Mcqs:

1. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

   A. Compartment mill
   B. Rod mill
   C. Pebble mill
   D. Tube mill

2. The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be_________________?

   A. 0.5 Wi
   B. Wi
   C. 1.34 Wi
   D. 3.34 Wi

3. 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

4. Use of ‘grinding aids’ is done in _______________ grinding?

   A. Dry
   B. Wet
   C. Ultrafine
   D. Intermediate

5. Wet grinding in a revolving mill ______________ as compared to dry grinding ?

   A. Gives less wear on chamber walls
   B. Requires more energy
   C. Increases capacity
   D. Complicates handling of the product

6. A _____________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end?

   A. Compartment
   B. Tube
   C. Rod
   D. Pebble

7. In closed circuit grinding as compared to open circuit grinding, the_________________?

   A. Specific surface of product is more
   B. Product has lesser size uniformity
   C. Production rate at a given limiting size is lower
   D. Operation is economical

8. 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

9. 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

10. 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