Q. If dₚ is the equivalent diameter of a non-spherical particle, Vₚ its volume and sₚ its surface area, then its sphericity is Φₛ is defined by

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

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Q. Pick out the wrong statement.

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Q. The distribution given by microscopic analysis of powder is

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Q. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vₚ = volume of one particle, ρ= density of particles)

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Q. For a non-spherical particle, the sphericity

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Q. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

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Q. Ball mills and tube mills with flint or porcelain balls are used for size reduction of

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Q. Jigging is a technique by which different particles can be

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Q. 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.

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Q. Balls for ball mills are never made of

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Q. 200 mesh screen means 200 openings per

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Q. __________ is the most commonly used 'filter aid'.

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Q. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

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Q. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

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Q. Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

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Q. Pick out the wrong statement pertaining to the roll crushers.

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Q. Which of the following is not an ultrafine grinder (colloid mill)?

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Q. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

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Q. For sizing of fine materials, the most suitable equipment is a

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