If you hear a CO2 activated alarm warning you to evacuate the engine room, how much time do you have to evacuate before the CO2 gas is released into the engine room?

Correct Answer: Option B — 20 seconds

Fixed CO2 fire extinguishing systems in machinery spaces are required by 46 CFR 95.15-10 to include a time delay mechanism. This 20-second delay provides sufficient time for personnel to evacuate the space before the discharge of gas, which poses a significant asphyxiation hazard to anyone remaining inside.