Fluid Mechanics
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

P and R
P, Rand S
P, Q and R
R and S

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Fluid Mechanics
Turbine impeller

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

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