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Mechanical Operations

Mechanical Operations
The sphericity of a cylinder of 1 mm diameter and length 3 mm is

0.6
0.5
0.78
0.9

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Mechanical Operations
Grindability of a material does not depend upon its

Size
Elasticity
Hardness
Toughness

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Mechanical Operations
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

π/6(=V/D³)
None of these
AD/V
π(=A/D²)

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

Decreasing machine capacity
None of these
Increasing size of feed at constant reduction ratio
Decreasing size of product at constant size of feed

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Mechanical Operations
Which of the following is not a wet classifier?

None of these
Dorr Oliver rake classifier
Hydrocyclones
Sharpies supercentrifuge

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Mechanical Operations
Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

Apron
Belt
Screw
Flight

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