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Mechanical Operations

Mechanical Operations
Size reduction does not occur due to compression in case of

Gyratory crushers
Smooth roll crushers
Rod mills
Jaw crushers

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D
2 D
0.5 D
1.5 D

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Mechanical Operations
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

Dispersion
Centrifugation
Flocculation
Sedimentation

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Mechanical Operations
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.

Tailing
Middling
Concentrate
None of these

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Mechanical Operations
Carbon black is pulverised in a

Hammer crusher
Roll crusher
Ball mill
Gyratory crusher

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Mechanical Operations
increasing the capacity of a screen __________ the screen effectiveness.

Increases
Decreases
None of these
Does not effect

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