NRCC Instrumentation Practice Test

Static head is defined as what in a fluid system?

The atmospheric pressure The pressure difference across a valve The pressure due to the height of fluid above a reference point The outlet pressure

Correct Answer:

The pressure due to the height of fluid above a reference point

Explanation:

Static head is the pressure produced by the weight of the fluid column above a reference point, due to gravity. In a fluid column, pressure rises with depth according to P = ρ g h, where ρ is the fluid density, g is gravity, and h is the vertical distance of the fluid above the point. Expressed as a head, this same pressure corresponds to a height h_p = P/(ρ g) of fluid. So the static head represents the hydrostatic pressure from the fluid’s elevation, independent of any fluid motion. It’s not atmospheric pressure, not the pressure difference across a valve, and not the outlet pressure.

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