PSSR Exit Exam • Set 6 Question 18 of 30

What safety device is fitted on crankcases of medium and large marine diesel engines to relieve explosion pressure?

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Direct Answer

Option A: Crankcase explosion relief valves with flame traps

Hot spot ignition of oil mist causes crankcase explosions; spring-loaded relief valves release overpressure while internal flame traps prevent secondary atmospheric fires.

All Options

Crankcase explosion relief valves with flame traps (Correct Answer)

Manual drain cocks

Plastic inspection windows

Rubber expansion joints

Detailed Explanation & Context

Hot spot ignition of oil mist causes crankcase explosions; spring-loaded relief valves release overpressure while internal flame traps prevent secondary atmospheric fires.

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

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More Questions in PSSR Set 6

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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?