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Mechanical Operations

Mechanical Operations
A widely used size reduction equipment for __________ is Bradford breaker.

Talc
Coal
Wheat
Iron core

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Mechanical Operations
Pine oil and cresylic acid are used as __________ in the froth floatation process.

Conditioner
Frother
Collector
Depressor

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Mechanical Operations
Which of the following is not a wet classifier?

Hydrocyclones
Dorr Oliver rake classifier
None of these
Sharpies supercentrifuge

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Mechanical Operations
Cyclones are used primarily for separating

Solids from fluids
Solids
Liquids
Solids from solids

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Mechanical Operations
Size reduction of asbestos and mica is done by

Gyratory crushers
Hammer mills
Rod mills
Crushing rolls

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re0.0
Po ∝ Re0.5
Po ∝ Re-1.0
Po ∝ Re1.0

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