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Mechanical Operations

Mechanical Operations
Fluid medium used in the classification technique of mineral beneficiation is

Water
Neither A nor B
Both A & B
Air

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Mechanical Operations
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

Froth floatation
Baum jig washer
Trough washer
Spiral separator

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Mechanical Operations
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?

0.5
0.66
1
2.76

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Mechanical Operations
Ball mill is used for

Attrition
Fine grinding
Crushing
Coarse grinding

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Mechanical Operations
Which of the following must be stored in silos and not in open yard?

None of these
Coke breeze
Sand
High V.M. bituminous coal

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Mechanical Operations
Paddle agitator

Is suitable for mixing low viscosity liquids
Produces axial flow
Moves at very high speed
None of these

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