SDI Open Water Scuba Diver Practice Exam

Which technique should be avoided when attempting to clear a regulator?

1. Inhaling sharply

2. Exhaling into the second stage

3. Using the purge button

4. Shaking your head vigorously

The correct answer is: Inhaling sharply

When clearing a regulator, inhaling sharply is a technique that should be avoided because it can lead to further complications, especially if water is present in the second stage. Inhaling sharply may create a vacuum effect that pulls more water into the mouthpiece or even make it harder to exhale properly, which is crucial for clearing the regulator. The goal of clearing a regulator is to ensure that water is expelled and a gas supply is maintained; techniques that disrupt the natural airflow can hinder this process. Exhaling into the second stage is a commonly recommended method to clear a regulator, as it helps push water out of the device. Utilizing the purge button is also effective in forcing water out, making it a standard practice among divers. Shaking your head vigorously is not a legitimate technique for regulator clearing and could lead to disorientation, but it does not specifically encourage the intake of water like inhaling sharply might.