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Mechanical Operations

Mechanical Operations
Which of the following is not a non-metalliferous mineral?

Cassiterrite
Fluorspar
Quartz
Calcite

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

Flight
Belt
Apron
Screw

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

Rod mills
Smooth roll crushers
Gyratory crushers
Jaw crushers

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Mechanical Operations
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m³)

3.6 W.D.V.ρ
3.6 W.D.V.
3.6 D.V.ρ
3.6 W.V.ρ

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Mechanical Operations
Optimum ratio of operating speed to critical speed of a trommel is

1.33-1.45
0.5-2
0.33-0.45
1.5-2.5

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Mechanical Operations
In case of a hammer crusher, the final product size depends on the

Feed rate
All of these
Rotor speed
Clearance between hammer & grinding plates

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