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 and R
P, Q and R
P, Rand S

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

All of these
Relative roughness
Friction co-efficient for flows at equal Reynold number
Absolute roughness

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Fluid Mechanics
Steady flow occurs, when the

Conditions are the same at the adjacent points at any instant
Conditions do not change with time at any point
Conditions change steadily with time
Rate of the velocity change is constant

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