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Ore concentration by jigging is based on the difference in the ______________ of the particles? A. Specific gravities B. Wettability C. Shape D. None of these
Use of baffles in agitators help in minimising the ______________ tendency? A. Swirling B. VortexingC. Both A. & B. D. Neither A. nor B.
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…
A tube mill compared to a ball mill__________________? A. Has a higher length/diameter ratio B. Produces a coarser product C. Has a higher diameter/length ratio D. Uses much larger balls
Grizzlies are used for separating _____________ solids? A. CoarseB. Fine C. Any size D. None of these
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 lowerD. Operation is economical
In bag filters, filter fabrics are never made of__________________? A. Metallic wire woven mesh B. Polyester fibres C. Cotton fibres D. Nylon fibres
For crushing of solids, the Rittinger’s law states that the work required for crushing is proportional to __________________? A. The new surface created B. The size reduction ratio C. The change in volume due to crushing D. None of these
Which of the following screens has the maximum capacity ? A. Grizzlies B. Trommels C. Shaking screenD. Vibrating screen
For spheres, volume shape factor is given by____________________? A. π = (A/D2) B. 2π = (2A/D2)C. π/6 = (V/D3) D. AD/V