Use of ‘grinding aids’ is done in _______________ grinding?
Use of ‘grinding aids’ is done in _______________ grinding?
A. Dry
B. Wet
C. Ultrafine
D. Intermediate
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Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?
Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?A. Drag
B. Ribbon
C. Screw
D. SlatHalf the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?
Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?A. cos α = (dr + dp)/(dr + df)
B. cos α = (dr + df)/(dr + dp)
C. tan α = (dr + dp)/(dr + df)
D. sin α = (dr + dp)/(dr + df)For a non-spherical particle, the sphericity__________________?
For a non-spherical particle, the sphericity__________________?A. Is defined as the ratio of surface area of a sphere having the same volume as the particle to the
actual surface area of the particle
B. Has the dimension of length
C. Is always less than 1
D. Is the ratio of volume of a sphere having the same surface area as the particle to the actual
volume of the particleThe reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?
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 theseBucket elevators are not suitable for the vertical lifting of __________ materials?
Bucket elevators are not suitable for the vertical lifting of __________ materials?A. Fine (e.g. – 200 mesh size coal)
B. Sticky (e.g. clay paste)
C. Small lumpy (e.g. grains and sand)
D. Free flowingAs particle size is reduced__________________?
As particle size is reduced__________________?A. Screening becomes progressively more difficult
B. Screening becomes progressively easier
C. Capacity and effectiveness of the screen is increased
D. None of these