Engineering :: Fluid Mechanics and Hydraulic Machines

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In which of the following cases it is possible for flow to occur from low pressure to high pressure?

[A].	Flow through a converging section	[B].	Adiabatic flow in a horizontal pipe
[C].	Flow of liquid in a vertical pipe	[D].	Flow of air downward in a pipe
[E].	None of the above

Answer: Option A