Fluid Mechanics
Power number is the ratio of

Gravitational stress to drag stress
Inertial stress to gravitational stress
Drag stress to inertial stress
Inertial stress to drag stress

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Fluid Mechanics
Turbine impeller

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

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Fluid Mechanics
Vane anemometer

Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed
Is an area meter
Is a variable head meter
None of these

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