Engineering :: Fluid Mechanics and Hydraulic Machines

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A mouthpiece cannot be used under very large head because

[A].	The variation in discharge is large	[B].	The flow through mouthpiece is erratic
[C].	Vortex is created at the vena contracta	[D].	Cavitation occurs at the vena contracta
[E].	Of practical difficulties in contraction

Answer: Option B