What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?

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In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?

A. Primary B. Secondary C. Fine D. Ultrafine...

Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?

A. State or manner of application of the crushing force B. Ultimate strength of the material C. Elastic constant of the material D. All A., B. and C....

Width and speed of a conveyor belt depends upon the ______________ of the material?

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Which of the following is not categorised as a “mechanical operation”?

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