A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?

Question

Accepted Answer

0.50. Screen effectiveness is calculated as (Oversize in Overflow / Oversize in Feed). Using the given values: 0.79 / 0.38 ≈ 2.08, which suggests a different formula might be intended or the provided answer A=0.50 relies on a specific interpretation not immediately clear from standard definitions.