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Mechanical Operations

Mechanical Operations
The operating speed of a ball mill should be __________ the critical speed.

Less than
Much more than
At least equal to
Slightly more than

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

Conditioner
Frother
Collector
Depressor

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Mechanical Operations
Solid particles separation based on the difference in their flow velocities through fluids is termed as the

Clarification
Classification
Elutriation
Sedimentation

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Mechanical Operations
Fibrous material is broken by a

Ball mill
Tube mill
Rollcrusher
Squirrel-cage disintegrator

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Mechanical Operations
In closed circuit grinding as compared to open circuit grinding, the

Production rate at a given limiting size is lower
Specific surface of product is more
Operation is economical
Product has lesser size uniformity

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Mechanical Operations
Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

KWh/kg
Kg/sec
KW. sec/kg
KWh/sec. kg

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