PADI Scuba Equipment Assembly & Function 5 — Questions and Answers
Question 1: What is the standard color coding used for an alternate air source (octopus) second stage in recreational diving?
- Red
- Blue
- Yellow or bright orange (Correct answer)
- Black with white stripe
Correct answer: Yellow or bright orange
Bright yellow or orange coloring makes the alternate air source highly visible so a buddy can quickly locate it in an out-of-air emergency.
Question 2: During a buddy check, your buddy's BCD inflates but does not deflate when the deflate button is pressed. What is the likely cause?
- The tank valve is only half open
- The deflate button or dump mechanism is stuck or disconnected (Correct answer)
- The BCD bladder has a hole
- The inflator hose is the wrong length
Correct answer: The deflate button or dump mechanism is stuck or disconnected
A stuck or mechanically disconnected deflate button prevents the exhaust valve from opening, trapping air in the BCD.
Question 3: What does a visual cylinder inspection (VCI) sticker on a scuba tank indicate?
- The tank passed a hydrostatic pressure test that year
- The interior was visually inspected for corrosion and damage within the past year (Correct answer)
- The cylinder is approved for nitrox use
- The valve was replaced and lubricated
Correct answer: The interior was visually inspected for corrosion and damage within the past year
A valid VCI sticker shows the tank interior was inspected for rust, pitting, or debris within the last 12 months.
Question 4: Why is it important to open a cylinder valve slowly before doing a full open?
- Rapid opening can over-pressurize the regulator first stage (Correct answer)
- Slow opening prevents the SPG needle from bending
- It allows the O-ring to seat gradually under pressure
- Rapid opening is only dangerous on aluminum tanks
Correct answer: Rapid opening can over-pressurize the regulator first stage
Opening the valve rapidly causes an adiabatic pressure spike that can damage O-rings and internal regulator components, and creates a fire risk with oxygen-enriched gases.
Question 5: What is the primary advantage of an integrated weight system in a BCD over a traditional weight belt?
- It always provides more lift than a standard BCD
- Weights can be jettisoned while keeping the BCD, and are less likely to slide out of position (Correct answer)
- It allows carrying more total weight
- It eliminates the need for a wetsuit
Correct answer: Weights can be jettisoned while keeping the BCD, and are less likely to slide out of position
Integrated weights stay properly positioned throughout the dive and can be released in an emergency while retaining the BCD for buoyancy.
Question 6: After assembling scuba gear, a diver opens the tank valve and hears a brief hiss that stops immediately. What does this indicate?
- A serious leak requiring immediate equipment service
- Normal pressurization of the system as the regulator fills with air (Correct answer)
- The BCD is deflating through the inflator hose
- The SPG is over-range
Correct answer: Normal pressurization of the system as the regulator fills with air
A brief hiss as the regulator pressurizes is normal; a continuous hiss indicates a leak that must be addressed before diving.
Question 7: What is the correct procedure if a diver discovers a cracked or brittle fin strap before a dive?
- Reinforce it with dive tape and proceed
- Replace the strap or use a different pair of fins before diving (Correct answer)
- Only replace it if the crack is longer than 2 cm
- Use the fin without the strap by holding it with the toes
Correct answer: Replace the strap or use a different pair of fins before diving
A cracked fin strap can fail underwater, causing fin loss and making it difficult to swim; it must be replaced before the dive.
PADI Scuba Equipment Assembly & Function 5
What is the standard color coding used for an alternate air source (octopus) second stage in recreational diving?