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Mechanical Operations

Mechanical Operations
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?

32°
40°
16°
46°

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Mechanical Operations
__________ mills are termed as impactors.

None of these
Cage
Rolling-compression
Hammer

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Mechanical Operations
__________ mill is normally used for grinding of talc.

Pebble
Ring-roll
Compartment
Tube

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

2 D
1.5 D
D
0.5 D

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Mechanical Operations
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

3.34 Wi
0.5 Wi
Wi
1.34 Wi

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Mechanical Operations
For sizing of fine materials, the most suitable equipment is a

Trommel
Vibrating screen
Grizzly
Shaking screen

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