NAUI Equipment Use & Maintenance 3

Question 1

What is the primary purpose of a tank boot (cylinder boot)?

Accepted Answer

To provide a stable upright base and protect the cylinder bottom

Answer

A tank boot fits over the curved bottom of a cylinder to allow it to stand upright and to protect the metal from abrasion.

Question 2

During a post-dive equipment check, a diver finds that the BCD over-pressure relief valve (OPV) opens spontaneously at low inflation. What should the diver do?

Accepted Answer

Remove the BCD from service until the OPV is serviced or replaced

Answer

An OPV that opens at low pressure indicates the valve spring has weakened or debris is preventing a proper seal, making the BCD unreliable and requiring service.

Question 3

Why must the dust cap be secured on a first-stage regulator before rinsing?

Accepted Answer

To stop water from entering the first stage and contaminating the internals

Answer

The dust cap keeps water out of the inlet port so it cannot reach internal components, which would promote corrosion and contamination.

Question 4

Which symptom most clearly indicates a regulator second stage needs professional servicing?

Accepted Answer

A faint hiss of continuous free-flow at the surface

Answer

Continuous free-flow indicates the demand valve is not seating properly, wasting air and potentially overwhelming a diver's ability to manage gas supply.

Question 5

What is the recommended interval for professional regulator servicing according to most manufacturers and NAUI standards?

Accepted Answer

Annually or after every 100 dives, whichever comes first

Answer

Most manufacturers and NAUI recommend annual servicing or after 100 dives (whichever comes first) to replace wear parts and ensure reliable performance.

(NAUI) National Association of Underwater Instructors Certification Practice Test

(NAUI) National Association of Underwater Instructors Certification Practice Test

NAUI Equipment Use & Maintenance 3