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Mechanical Operations

Mechanical Operations
Which of the following comes in the category of primary crusher for hard and tough stone?

Gyratory crusher
Cone crusher
None of these
Jaw crusher

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = 6 Vp/dp sp
Φs = dp Sp/Vp
Φs = Vp/dp sp
Φs = 6 dp Sp/Vp

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Mechanical Operations
Mixing of light fine powder such as insecticides is done by

Pug mill
Banbery mixer
Impact wheels
Kneader

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Mechanical Operations
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

Kick's law
Rittinger's law
Bond's law
None of these

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Mechanical Operations
Compressibility co-efficient for an absolutely compressible cake is

∞
1
0 to 1

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Mechanical Operations
Horsepower required for a roll crusher is directly proportional to its

Neither A nor B
Reduction ratio
Capacity
Both A & B

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