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Mechanical Operations

Mechanical Operations
Which of the following mineral dressing operations is termed as 'comminution'?

Panning
None of these
Tabling
Spiralling

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Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.58
0.5
0.62
0.68

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Mechanical Operations
Which of the following is a coarse crusher?

Toothed roll crusher
Smooth roll crusher
Tube mill
Gyratory crusher

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Mechanical Operations
Tube mill compared to ball mill

Uses smaller balls
Is long in comparison with its diameter
Produces finer products
All of these

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Mechanical Operations
Screen efficiency is

None of these
Recovery
Recovery/rejection
Rejection

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Mechanical Operations
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

Resins
Waxes
Gums
Hard rubber

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