How many 1" solid bore nozzles are needed to match the GPM of a 2" solid bore nozzle, given they operate at the same pressure?

Conquer the Lafayette Fire Department Captain Test with comprehensive multiple-choice questions and insights. Enhance your understanding with detailed explanations and ace your exam with ease!

To determine how many 1" solid bore nozzles are required to match the Gallons Per Minute (GPM) of a 2" solid bore nozzle operating at the same pressure, it’s essential to understand the flow characteristics of nozzles and the relationship between their sizes.

A 2" solid bore nozzle typically has a significantly larger flow capacity compared to a 1" nozzle. The flow capacity of nozzles is directly related to the cross-sectional area of the opening. The area of a nozzle is calculated using the formula for the area of a circle, A = πr². As the radius of the nozzle increases, the area—and consequently, the flow rate—increases proportionately.

When comparing the areas of these two nozzles, the 2" nozzle has a much larger area than the 1" nozzle. Specifically, the area of a 2" nozzle is four times that of a 1" nozzle. Therefore, to achieve the same flow rate that a 2" nozzle provides, it would take four 1" nozzles operating together, since four times the area of a single 1" nozzle will equate to the area of the 2" nozzle.

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