

MCQOPTIONS
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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 | |