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:A
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