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Mechanical Operations

Mechanical Operations
The main size reduction operation in ultrafine grinders is

Attrition
Impact
Compression
Cutting

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Mechanical Operations
Fibrous material is broken by a

Ball mill
Rollcrusher
Tube mill
Squirrel-cage disintegrator

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Mechanical Operations
Shape factor for a cylinder whose length equals its diameter is

2.0
0.5
1.5
1.0

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

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Mechanical Operations
According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).

(S/V)p
(S/V)²p
√(S/V)p
(S/V)f

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Mechanical Operations
Which of the following is not an industrial screening equipment?

Trommel
Vibrating screen
Grizzly
Sharpies centrifuge

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