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Mechanical Operations

Mechanical Operations
For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

2250
460
230
1125

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Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Peclet
Brinkman
Weber
Schmidt

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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.

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

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Mechanical Operations
Traces of solids are removed from, liquid in a

Rotary vacuum filter
Sparkler filter
Clarifier
Classifier

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Mechanical Operations
increasing the capacity of a screen __________ the screen effectiveness.

Does not effect
Increases
None of these
Decreases

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Mechanical Operations
Which of the following is not a wet classifier?

Dorr Oliver rake classifier
Hydrocyclones
None of these
Sharpies supercentrifuge

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