Mechanical Operations
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

At the end of filtration
When half the filtrate has been obtained
At the end of filtration, but decreases with time subsequently
At time zero

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Mechanical Operations
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Ball mill, Jaw crusher, Fluid energy mill
Jaw crusher, Ball mill, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher
Fluid energy mill, Jaw crusher, Ball mill

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