Mechanical Operations
Helical screw agitator is used for

Mixing highly viscous pastes
None of these
Mixing liquids at very high temperature (> 250 °C)
Blending immiscible liquids

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Mechanical Operations
Bond crushing law

States that the work required for the crushing is proportional to the new surface created
Is less realistic in estimating the power requirements of commercial crushers
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
Calls for relatively less energy for the smaller product particles, than does the Rittinger law

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