Project ForgeFluid Mechanics
Mechanical Operations
GATE 2017
Easy
Gravel size analysis: xi=0.2 at Dpi=5mm, xi=0.4 at Dpi=10mm, xi=0.4 at Dpi=20mm. The mass mean diameter, to nearest integer, is
13 mm(± 0.5 accepted)
Explanation
Mass mean diameter=Σ(xi·Dpi)=0.2×5+0.4×10+0.4×20=1+4+8=13mm.
Source: GATE CH 2017 (2017)
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