PSSR Exit Exam • Set 6 Question 10 of 30

What is the primary danger of using carbon dioxide (CO2) in a fixed engine room fire extinguishing system?

✓

Direct Answer

Option A: CO2 displaces oxygen rapidly, causing fatal asphyxiation to anyone inside

Fixed CO2 systems smother fire by reducing O2 below 15%; total flooding will cause rapid unconsciousness and death to personnel who fail to evacuate.

All Options

CO2 displaces oxygen rapidly, causing fatal asphyxiation to anyone inside (Correct Answer)

CO2 causes immediate steel corrosion

CO2 explodes upon contact with diesel oil

CO2 is highly toxic to touch

Detailed Explanation & Context

Fixed CO2 systems smother fire by reducing O2 below 15%; total flooding will cause rapid unconsciousness and death to personnel who fail to evacuate.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Personal Safety & Social Responsibilities (PSSR).

Practice Full PSSR Set 6

Test yourself with 30 interactive questions, live timer, and instant score.

Launch Practice Simulator →

Question Discussion & Notes

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...

« Previous Question Next Question »

More Questions in PSSR Set 6

View All 30 →

Q1 What is the purpose of Risk Assessment before carrying out non-routine shipboard tasks? Q2 Under MARPOL Annex IV, what is the requirement for discharging sewage from an approved sewage treatment plant into the sea? Q3 What safety device is fitted on gas cylinders to prevent overpressure explosion in a fire? Q4 What precaution must be taken before opening steam lines or boiler blowdown valves? Q5 What color coding is universally used on ships to identify Emergency Fire Fighting Equipment locations? Q6 What precaution is required when storing oxygen and acetylene cylinders in gas welding stations? Q7 What action must a seafarer take if a piece of power machinery exhibits abnormal vibration or strange noise? Q8 Under the Maritime Labour Convention (MLC 2006), what fundamental right is guaranteed to all seafarers? Q9 What safety equipment is required when handling battery banks containing liquid sulfuric acid? Q10 What is the primary danger of using carbon dioxide (CO2) in a fixed engine room fire extinguishing system?