Q. The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

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Q. Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?

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Q. Pick out the correct statement:

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Q. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

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Q. Highly viscous liquids & pastes are agitated by

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Q. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

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Q. Equivalent diameter of a particle is the diameter of the sphere having the same

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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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