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Mechanical Operations

Mechanical Operations
Wheat is ground into flour in a

Impact mill
Roller crusher
Fluid energy mill
Hammer crusher

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Mechanical Operations
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.

2
12
8
20

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

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Mechanical Operations
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.

Tailing
None of these
Concentrate
Middling

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Mechanical Operations
For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

2250
1125
230
460

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Mechanical Operations
Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called

Thickening
Classification
Clarification
Froth floatation

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