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Mechanical Operations

Mechanical Operations
The crushed material received for separation is called feed or

Tailing
Middling
Concentrate
Heading

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Mechanical Operations
Mass flow of granular solid (M) through a circular opening of dia, D follows

M ∝ D²
M ∝ D³
M ∝ D
M ∝ √D

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Mechanical Operations
Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

0.2 to 0.8
0.2 to 0.4
0.1 to 0.3
0.01 to 0.1

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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.

None of these
Middling
Concentrate
Tailing

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Mechanical Operations
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

Attrition
Roller
Buhrstone
Pebble

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Mechanical Operations
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

Cube
Cylinder (L/D = 1)
Sphere
Raschig rings

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