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Mechanical Operations

Mechanical Operations
Dry powdery solid materials are transported by a __________ conveyor.

Bucket
Belt
Screw
None of these

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

1.0
2.0
0.5
1.5

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Mechanical Operations
For spheres, volume shape factor is given by

2π(=2A/D²)
AD/V
π/6(=V/D³)
π(=A/D²)

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

Ball mill
Fluid energy mill
Rod mill
Jaw crusher

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = 6 Vp/dp sp
Φs = 6 dp Sp/Vp
Φs = Vp/dp sp
Φs = dp Sp/Vp

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

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