Your examiner asks: "The fixed CO2 flooding system's cylinders are not fitted with a simple pressure gauge like a portable extinguisher — how is their content actually verified, and how often?"

A. Fixed CO2 system cylinders are periodically WEIGHED (or their liquid CO2 level checked by an equivalent method such as an ultrasonic or radioactive-isotope level detector) — commonly on an annual basis — to confirm the cylinder has not lost an unacceptable proportion of its charge through slow leakage over time. If a cylinder is found to have lost a significant proportion of its original charge (a commonly-cited threshold is around a 10% weight loss), it must be recharged or replaced, since an under-charged cylinder will not deliver the full design quantity of CO2 needed to achieve and maintain an effective extinguishing concentration in the protected space. Cylinders are also subject to the same longer-interval periodic hydrostatic/internal testing regime as other pressure vessels on board.

B. Fixed CO2 cylinders are fitted with a simple analogue pressure gauge identical to a portable extinguisher, and their charge is verified purely by reading this gauge, with no weighing or level-detection method used.

C. Fixed CO2 cylinder charge is never checked after initial installation — once commissioned, the system is assumed to remain fully charged for the vessel's entire service life with no periodic verification.

D. CO2 cylinder weight loss of any amount, however small, is considered acceptable and never triggers recharging or replacement under any circumstances.

A. Nothing — a test lift can proceed immediately after repairs

B. Testing should wait until cargo operations begin

C. The area within the grab's swing radius should be cleared of personnel before the lift

D. Only the crane operator needs to be aware the lift is happening

A. Who must remain clear of the exclusion zone while the lift takes place

B. The lunch schedule for the deck team

C. Only the weather forecast for the next watch

D. The cargo manifest for the next port