Engineering :: Fluid Mechanics and Hydraulic Machines

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In an impulse turbine

[A].	Water must be admitted over the whole circumference	[B].	It is not possible to regulate the flow without loss
[C].	Wheel must run full and kept entirely submerged in water below the tailrace	[D].	The pressure in the driving fluid as it moves over the vanes is atmospheric
[E].	None of the above

Answer: Option D