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Mechanical Operations

Mechanical Operations
With increase in the capacity of screens, the screen effectiveness

Increases
Decreases
Remains unchanged
Decreases exponentially

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Mechanical Operations
The value of 'angle of nip' is generally about

64°
32°
16°
52°

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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?

2.76
0.5
1
0.66

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Mechanical Operations
Gold ore concentration is mostly done using

Tabling
Jigging
Elutriation
Froth floatation

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Mechanical Operations
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

Attrition
Buhrstone
Pebble
Roller

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Mechanical Operations
Energy consumed for crushing one ton of material ranges from __________ kWh.

2 to 3.5
0.5 to 1.5
4 to 5
0.01 to 0.1

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