Q. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.

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Q. 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 ?

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Q. Carbon black is pulverised in a

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Q. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the

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Q. The filtrate flow rate in constant pressure filtration

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Q. Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

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Q. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of

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Q. The inlet pressure in a constant rate filtration

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Q. Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.

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Q. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.

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Q. __________ centrifuge is the most suitable for separation of non-friable crystals.

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Q. For benefication of iron ore, the most commonly used method is

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Q. The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

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Q. In classification, particles are said to be equal settling, if they have the same terminal velocities in the

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Q. Dispersion of a gas through liquid is done by using a

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Q. Work index is defined as the

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Q. Removal of activated carbon from glycerine is done by

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Q. A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

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Q. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called

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Q. Reciprocal of sphericity is termed as the

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