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

View solution

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.

View solution

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

View solution

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

View solution

Q. Wheat is ground into flour in a

View solution

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

View solution

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

View solution

Q. Toothed roll crushers achieve size reduction by

View solution

Q. Pick out the wrong statement:

View solution

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

View solution

Q. In constant pressure filtration,

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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)

View solution

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

View solution

Q. Weber number is significant and is concerned with the

View solution

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

View solution

Q. Cake resistance is

View solution