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WSDA Pest Control Operator (PCO) Practice Exam

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What type of nozzle sprays in a cone pattern with droplets throughout?
Correct Answer:
Solid-cone
Explanation:
Understanding how nozzle spray patterns distribute droplets helps you predict coverage and drift risk. A solid-cone nozzle emits a dense, continuous cone, so droplets are present throughout the entire cone—from center to edge—providing uniform coverage of the target area. In contrast, a hollow-cone nozzle sprays droplets primarily around the outer edge of the cone, leaving a void in the center; an air-atomizing nozzle creates very fine droplets carried by air, producing a mistier pattern that isn’t a solid cone; boomless simply refers to a sprayer design and not a specific spray pattern. Therefore, the type that sprays in a cone pattern with droplets throughout is the solid-cone nozzle.

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