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Mechanical Operations

Mechanical Operations
Which of the following is a fine crusher?

Gyratory crusher
Blake jaw crusher
Toothed roll crusher
Dodge jaw crusher

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Mechanical Operations
Screen capacity is proportional to (where, S = screen aperture)

1/S
S
√S
S²

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Mechanical Operations
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

Vp/m . ρ
M . ρ/Vp
M . Vp/ρ
M/ρ . Vp

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Mechanical Operations
Specific surface area is the surface area of a unit __________ of materials.

Weight
Volume
Neither A nor B
Either A or B

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

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Mechanical Operations
Weber number is significant and is concerned with the

Liquid-liquid mixing
Suspension of solid in liquid
Dispersion of liquid in liquid
Solid-liquid mixing

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