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.

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

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Fluid Mechanics
Vane anemometer

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

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