NAUI Equipment Use & Maintenance 2

Question 1

After a saltwater dive, what is the most important first step when rinsing your regulator?

Accepted Answer

Blow air through the second stage before submerging in fresh water

Answer

Purging air through the second stage before rinsing prevents water from entering the first stage through the low-pressure port.

Question 2

Which BCD component is most likely to trap salt crystals and cause corrosion if not properly rinsed?

Accepted Answer

The inflator/deflator mechanism

Answer

The inflator/deflator mechanism has small internal valves and passageways where salt crystals accumulate and cause sticking or corrosion.

Question 3

When storing a wetsuit long-term, which method best preserves the neoprene?

Accepted Answer

Hang it on a wide hanger in a cool, dark area

Answer

Hanging a wetsuit on a wide hanger in a cool, dark location prevents creasing, UV degradation, and compression of neoprene cells.

Question 4

A diver notices their submersible pressure gauge (SPG) reads higher than expected at the surface before a dive. What is the most likely cause?

Accepted Answer

Ambient temperature increase has raised cylinder pressure

Answer

Gas pressure increases with temperature; a cylinder filled in a cool environment will read higher when warmed by sun or ambient heat.

Question 5

What does a milky or cloudy appearance inside a diving mask lens typically indicate?

Accepted Answer

Salt residue from inadequate post-dive rinsing

Answer

A cloudy mask interior usually results from salt crystal buildup caused by insufficient fresh-water rinsing after dives.

(NAUI) National Association of Underwater Instructors Certification Practice Test