The seepage forces within the filter are controlled up to permissible – McqOptions

MCQOPTIONS

1.	The seepage forces within the filter are controlled up to permissible small magnitudes when the ratio of D₁₅ of filter to D₁₅ of base material is ___________________
A.	between 5 to 40
B.	less than 5
C.	between 5 to 20
D.	less than 4
Answer» B. less than 5

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