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MECHANICAL OPERATIONS

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)

M . ρ/Vp
Vp/m . ρ
M/ρ . Vp
M . Vp/ρ

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Mechanical Operations
To get ultrafine particles, the equipment used is a

Hammer crusher
Rod mill
Fluid energy mill
Ball mill

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Mechanical Operations
A tube mill as compared to a ball mill

Gives finer size reduction but consumes more power
Employs smaller balls
All of these
Has larger length/diameter ratio (>2 as compared to 1 for ball mill)

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Mechanical Operations
Tank filter (e.g., Nutsch filter) is

A continuous filter
A high pressure filter
A leaf filter
Used for small scale filtration work

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Mechanical Operations
Vacuum filter is most suitable for the

None of these
Liquids of very high viscosity
Liquids having high vapour pressure
Removal of fines from liquid

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