Q. In closed circuit grinding as compared to open circuit grinding, the

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Q. Pick out the correct statement.

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Q. Separation of solid particles based on their densities is called

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Q. Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

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Q. __________ are mixed using ribbon blenders.

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Q. During agitation of liquids, the

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Q. For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to

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Q. Traces of liquid tar fog present in coke oven gas is separated using

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Q. Close circuit grinding by a ball mill with air sweeping employs a

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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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