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Mechanical Operations

Mechanical Operations
Xanthates are used in the froth floatation process as a/an

Activator
Frother
Conditioner
Collector

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Mechanical Operations
Reduction ratio of crushers is the

Determining factor for minimum dia of the feed and the product
Ratio of feed opening to discharge opening
None of these
Ratio of discharge opening to feed opening

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Mechanical Operations
Sphericity of pulverised coal is

1
>1
∞

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Mechanical Operations
__________ conveyors are also called scrapers.

Helical flight
Both B & C
Apron
Screw

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Mechanical Operations
The main size reduction operation in ultrafine grinders is

Attrition
Cutting
Compression
Impact

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Mechanical Operations
A tube mill as compared to a ball mill

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
Gives finer size reduction but consumes more power
Employs smaller balls
All of these

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