PSSR Exit Exam • Set 5 Question 23 of 30

What is the primary danger of static electricity during tank cleaning or flammable liquid transfer?

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Direct Answer

Option A: Spark generation capable of igniting explosive vapor-air mixtures

High-velocity fluid flow or washing jets generate static charges; without proper bonding and grounding, electrostatic sparks can ignite cargo vapors.

All Options

Spark generation capable of igniting explosive vapor-air mixtures (Correct Answer)

Corrosion of steel bulkhead plates

Overheating of ballast pump bearings

Freezing of tank washing nozzles

Detailed Explanation & Context

High-velocity fluid flow or washing jets generate static charges; without proper bonding and grounding, electrostatic sparks can ignite cargo vapors.

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

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Q1 Under MARPOL Annex I, what is the maximum allowable oil content of discharge from the bilge of a ship outside special areas while en route? Q2 What permit is mandatory before any work involving naked flames, welding, or spark-producing tools can be carried out outside the workshop? Q3 Prior to entering an enclosed space, what is the minimum required oxygen content percentage by volume? Q4 What safety precaution must be taken when a seafarer is working at height above 2 meters over an open deck or over the side? Q5 What is the primary objective of Lockout / Tagout (LOTO) procedures on board? Q6 What general emergency alarm signal is sounded on a ship's whistle and internal alarm system? Q7 Which MARPOL Annex regulates the prevention of pollution by garbage from ships? Q8 What safety document provides essential health, hazard, and emergency response information for chemicals handled on board? Q9 What action must be taken immediately if a crew member witnesses someone falling overboard? Q10 Under MARPOL Annex VI, what is the global maximum allowable sulfur content in marine fuel oil outside Emission Control Areas (ECAs) as of 2020?