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Mechanical Operations

Mechanical Operations
Grinding efficiency of a ball mill is of the order of __________ percent.

43835
90-95
40-50
75-80

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Flint or porcelain
Concrete
Stainless steel
Bronze

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Mechanical Operations
The critical speed of a trommel (N) is related to its dia (D) as

N ∝ D
N ∝ √D
N ∝ 1/√D
N ∝ 1/D

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Mechanical Operations
Mixing mechanism employed in a pan mixer is by

None of these
Mulling
Dispersion
Kneading

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Mechanical Operations
Pine oil used in froth floatation technique acts as a/an

Collector
Activator
Frother
Modifier

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Mechanical Operations
Mesh indicates the number of holes per

Square foot
Linear inch
Square inch
Linear foot

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