Fluid Mechanics
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

Sump
Piston
Gear
Positive displacement

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Fluid Mechanics
Turbine impeller

Is effective over wide range of viscosities
Produces only tangential current
Does not produce tangential current
Produces only radial current

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