Which of the following is NOT a defective stream factor?

• A. Insufficient pressure
• B. Air in line
• C. Defective tip
• D. Proper nozzle

Answer: (D)

Defective stream factors are conditions that make the water jet unstable or inconsistent as it exits the nozzle. A properly functioning nozzle is not one of those factors because it supports a stable, predictable stream.

Insufficient pressure reduces velocity and can cause a weak, erratic stream that doesn’t reach as far or stay cohesive. Air in the line introduces pockets of air that cause pulsations and an uneven flow, breaking up the stream. A defective tip—whether damaged, worn, or clogged—distorts the spray pattern and compromises stream quality. In contrast, when the nozzle is clean and adjusted correctly, the stream remains coherent and reliable, so this is not a defective stream factor.