Q. In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))

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Q. Pine oil and cresylic acid are used as __________ in the froth floatation process.

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Q. Grinding characteristic of a material is given by its

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Q. Which of the following is not a non-metalliferous mineral?

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Q. Filter medium resistance is important during the __________ of filtration.

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Q. Float and sink test determines the possibility of cleaning of coal by a process based on the

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Q. For raschig rings, the sphericity is

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Q. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

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Q. __________ mills are termed as disintegrators.

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Q. Supporting legs of a plate and frame filter is normally made of

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Q. During filtration operation, the filtrate encounters the resistance of the

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Q. Filtration rate does not depend upon the

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Q. Which of the following is a fine crusher?

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Q. __________ is a cohesive solid.

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Q. The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

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Q. Use of grinding aids results in the

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Q. A belt conveyor used for the transportation of materials can

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Q. Which of the following is not used as a surface active agent in a flocculation operation?

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Q. __________ mill is not a revolving mill.

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Q. For the transportation of ultrafine particles, the equipment used is a........conveyor.

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