Discussion
A pumping device that combines the advantages of both centrifugal and reciprocating pumps is known as
Answer: D
The device is the rotary pump.
Rotary pumps (gear, vane, lobe and screw pumps) are positive displacement machines like the reciprocating pump: they trap a fixed volume per revolution, are self-priming and deliver against high pressure. Like the centrifugal pump, however, they rotate continuously, so they are compact, have no valves and give a nearly steady flow without the pulsation of a piston pump. That combination is why textbooks describe them as having the advantages of both.
An air lift pump raises water by injecting compressed air into the rising pipe. A hydraulic ram uses the water hammer of a large flow to lift a small part of it, with no external power. A jet pump uses a high-velocity jet in an ejector, usually supplied by a centrifugal pump, to draw water from a deep well.
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