Engineering :: Fluid Mechanics and Hydraulic Machines

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Which conduit entrance is expected to have highest loss coefficient?

[A].	Inward projecting entrances	[B].	Fully rounded entrance having x/D>0.15
[C].	Gate in thin wall-unsuppressed contraction	[D].	Gate in thin wall-bottom and side suppressed
[E].	Gate in thin wall-corners rounded

Answer: Option C