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Mechanical Operations

Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

1
√2
√3
0.5

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Mechanical Operations
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?

Micronizer
Fluid energy mill
All of these
Jet mills

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Mechanical Operations
Ultra centrifuges are used for the separation of __________ solid particles.

Coarse
Dissolved
Fine
Colloidal

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

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

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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.

Concentrate
Middling
None of these
Tailing

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Mechanical Operations
The capacity of a pneumatic conveying system depends upon the

Pressure of the conveying air
Bulk density of materials
Diameter of the conveying line
All of these

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