Which of the following is the most suitable for cleaning of fine coal dust (

A. Pressure filter
B. Gravity filter
C. Centrifugal filter
D. Vacuum filter

A. Its speed
B. Its ball load
C. The density of the material being ground
D. All A., B. and C.

A. Sparger
B. Kneader
C. Masticator
D. None of these

A. Apron
B. Belt
C. Screw
D. Flight

A. 0.9
B. 0.78
C. 0.6
D. 0.5

A. Fine (e.g. – 200 mesh size coal)
B. Sticky (e.g. clay paste)
C. Small lumpy (e.g. grains and sand)
D. Free flowing