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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

0.5
√2
√3
1

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Mechanical Operations
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

500°C and 50 atm
1000°C and 500 atm
200°C and 5 atm
1000°C and 10 atm

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Mechanical Operations
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).

4/D.p
2/D.p
6/D.p
12/D.p

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Mechanical Operations
Feed size of ≥ 25 cms can be accepted by

Rod mill
Ball mill
Jaw crusher
Fluid energy mill

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Mechanical Operations
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the

Feed material
Type of crushing machine
Both A & B
Neither A nor B

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Mechanical Operations
Pine oil used in froth floatation technique acts as a/an

Activator
Frother
Collector
Modifier

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