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Mechanical Operations

Mechanical Operations
The crushed material received for separation is called feed or

Concentrate
Tailing
Heading
Middling

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Mechanical Operations
In a roll crusher, the specific power consumption and the production rate is affected by the

Reduction ratio
Both A & B
Differential roll speed
Neither A nor B

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Mechanical Operations
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

0.90 μm/s
1 μm/s
0.02 μm/s
22.1 μm/s

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Mechanical Operations
Basic slag is not ground in

Tube mills
Compartment mills
Ball mills
Jaw crushers

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Mechanical Operations
Raw materials are charged in the iron blast furnace using

Screw conveyor
Bucket elevator
None of these
Skip hoist

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Mechanical Operations
Crushing efficiency of a machine ranges between __________ percent.

5 to 10
50 to 70
0.1 to 2
20 to 25

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