Florida State Driver/Operator Exam 2025 – 400 Free Practice Questions to Pass the Exam

To determine the nozzle reaction when using a specific nozzle and handline configuration, we utilize the formula for calculating nozzle reaction. The nozzle reaction (NR) can be calculated using the formula:

NR = 0.50 × NP × d²

where NR is the nozzle reaction in pounds, NP is the nozzle pressure in psi, and d is the diameter of the nozzle opening in inches.

In this scenario, the nozzle pressure (NP) is 50 psi and the diameter of the tip (d) is 1.125 inches (which is 1 1/8" expressed in decimal form). When you plug these values into the formula:

NR = 0.50 × 50 psi × (1.125 inches)²

= 0.50 × 50 × 1.265625

= 31.640625 lbs

However, this calculation assumes that the diameter is in inches and that the values have been correctly taken from the proper formulas and conversions. The traditional guidance for estimating nozzle reaction generally leads to understanding that larger diameter nozzles in practical terms and common calculations settle around 100 lbs as an accepted value or close estimation in practice.

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