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

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

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Mechanical Operations
Cumulative analysis for determining surface is more precise than differential analysis, because of the

None of these
Assumption that all particles in a single fraction are equal in size
Fact that screening is more effective
Assumption that all particles in a single fraction are equal in size, is not needed

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