PADI Scuba Equipment Assembly & Function 4

Question 1

When assembling scuba gear, at what point should the diver open the tank valve to check the system?

Accepted Answer

After attaching the regulator and routing all hoses

Answer

Open the valve after the regulator is attached and hoses are routed so you can safely check for leaks and verify pressure readings.

Question 2

What does the term 'piston first stage' refer to in regulator design?

Accepted Answer

A first stage where a moving piston responds to pressure changes to deliver air

Answer

In a piston first stage, a moving piston opens and closes in response to downstream pressure, delivering intermediate-pressure air.

Question 3

Why should a diver avoid storing a wetsuit in direct sunlight for extended periods?

Accepted Answer

UV exposure degrades neoprene, reducing insulation and flexibility

Answer

Ultraviolet radiation breaks down neoprene's cellular structure over time, shortening the wetsuit's thermal protection and lifespan.

Question 4

What should a diver check on the SPG (submersible pressure gauge) before every dive?

Accepted Answer

That the needle reads the correct cylinder pressure and the lens is free of cracks

Answer

A cracked lens can implode under pressure, and an accurate reading confirms the cylinder is properly filled before the dive.

Question 5

What is the consequence of assembling a regulator onto a cylinder with a missing or damaged O-ring?

Accepted Answer

Air will leak at the connection, potentially causing rapid pressure loss

Answer

The O-ring provides the pressure seal at the valve-regulator interface; a damaged or missing O-ring results in an air leak.

PADI - Professional Association of Diving Instructors Practice Test