Emergency Vehicle Technician (EVT) F-3 Practice Exam

Which term describes the forward pressure measured at a discharge opening when water is flowing?

Flow pressure Static pressure Residual pressure Head pressure

Correct Answer:

Flow pressure

Explanation:

When water is moving, the pressure you observe at the discharge opening is the flow pressure. This value reflects the actual pressure the stream has as it leaves the nozzle, taking into account friction, fittings, and nozzle resistance that reduce pressure from the source. Static pressure, by contrast, is measured when no water is flowing, so it shows the pressure available in the system without any flow losses. Head pressure relates to the height of the water column and the resulting pressure from elevation, not the dynamic conditions at the discharge. Residual pressure is the remaining pressure in the system as water is flowing, often used to gauge what pressure is still available after losses, but it doesn’t represent the instantaneous discharge opening pressure itself.

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