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What is CU in the expression CU= D60/D10 where D60 and D10 are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively?

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What is CU in the expression  CU= D60/D10  where D60 and D10 are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively?

(a) Coefficient of compaction

(b) Coefficient of consolidation

(c) Uniformity coefficient

(d) Effective size

I got this question by my college director while I was bunking the class.

Question is from Filter Media topic in section Filtration of Environmental Engineering

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Correct choice is (c) Uniformity coefficient

For explanation: The uniformity coefficient is a measure of particle range and it is the ratio of D60 and D10 sizes. It is denoted by CU.

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