Discussion
Which one of the following is NOT a rotating machine?
Answer: C
The jet pump is not a rotating machine.
A jet pump (ejector) has no moving parts: a high-velocity motive jet of fluid entrains the fluid to be pumped through momentum exchange in a mixing chamber and diffuser.
The others all rotate. A centrifugal pump uses a rotating impeller. A gear pump carries fluid round in the spaces between meshing rotating gears. A vane pump has a rotor with sliding vanes turning in an eccentric casing.
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