A fluid energy mill is used for_________________?

Related Mcqs:

1. 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

2. A fluid energy mill is used for __________________?

   A. Cutting
   B. Grinding
   C. Ultra-grinding
   D. Crushing

3. Fluid energy mill comes in the category of________________?

   A. Grinder
   B. Crusher
   C. Cutter
   D. Ultrafine grinder

4. Maximum size reduction in a fluid energy mill is achieved by___________________?

   A. Compression
   B. Interparticle attrition
   C. Cutting
   D. Impact

5. Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?

   A. Nc = (1/4π). √(g/R1 – R2)
   B. Nc = (1/2π). √(g/R1 – R2)
   C. Nc = (1/π). √(g/R1 – R2)
   D. Nc = (1/2π). √(R1 – R2/g)

6. ______________ mill is not a revolving mill ?

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

7. The main differentiation factor between tube mill and ball mill is the ___________________?

   A. Length to diameter ratio
   B. Size of the grinding media
   C. Final product size
   D. Operating speed

8. Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?

   A. Impact
   B. Roll
   C. Vibratory
   D. None of these

9. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.) ?

   A. D
   B. 1/D
   C. D2.5
   D. 1/D2.5

10. Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?

    A. Wet grinding in low viscous suspension
    B. Wet grinding in high viscous suspension
    C. Dry grinding of large particles (upto 1.25 cms)
    D. Dry grinding of large particles in un-baffed mills