Q. Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

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Q. Choke crushing (in case of a Jaw crusher) compared to free crushing

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Q. The specific surface of sherical particles is proportional to (where, Dₚ = diameter of particle).

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Q. Wheat is ground into flour in a

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Q. Gravity stamp mill is meant for the __________ crushing.

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Q. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

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Q. Toothed roll crushers achieve size reduction by

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Q. Pick out the wrong statement:

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Q. Soft & non-abrasive materials can be made into fines by

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Q. In constant pressure filtration,

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Q. The critical speed of a trommel (N) is related to its dia (D) as

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Q. Which of the following minerals is not subjected to magnetic separation method?

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Q. Which of the following is not a revolving/tumbling mill used for size reduction?

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Q. __________ mills fall in the category of tumbling mills.

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Q. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre, V = speed of the conveyor in metre/second, ρ = bulk density of material in kg/m³)

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Q. Which of the following is not a cutting machine?

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Q. Weber number is significant and is concerned with the

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Q. Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.

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Q. Cake resistance is

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Q. In paint industries, blending of light paste is done by using a

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