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

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Mechanical Operations
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Ball mill, Jaw crusher, Fluid energy mill
Fluid energy mill, Jaw crusher, Ball mill
Jaw crusher, Ball mill, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher

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