EC12 QUIZ

The supply of carbon dioxide used in a fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for:

• All cargo spaces

• The engine room and largest cargo space

• The space requiring the largest amount

• All the spaces of a vessel

By definition, spontaneous combustion is a result of:

• An outside heat source heating a substance until it ignites

• Chemical reactions within a substance

• Conduction of heat through a wall of material to the substance

• All of the above

The piece of equipment shown in the illustration is used in conjunction with a fire hose to produce which of the listed fire extinguishing agents?

• High velocity fog

• Chemical foam

• Low velocity fog

• Mechanical foam

Which of the following fire extinguishing agents is best suited for use on a large class "B" fire occurring on the open deck of a vessel?

• Aqueous film forming foam

• CO₂

• Dry chemical

• Steam smothering system

An extinguishing agent which effectively cools, dilutes combustible vapors, and provides a heat and smoke screen is:

• Water fog

• Halon 1301

• Dry chemical

• Carbon dioxide

Through which of the listed processes is sufficient heat produced to cause spontaneous ignition?

• Heat of oxidation

• Heat of expansion

• Latent heat of sublimation

• Latent heat of condensation

Firefighting foam is only effective when the foam:

• Penetrates to the bottom of the fire

• Completely covers the top of the burning liquid

• Is kept saturated with low velocity water fog

• Mixes with the burning fuel oil

The advantage of using a dry chemical fire extinguishing agent is:

• Its excellent cooling ability

• Permanent extinguishment regardless of the reignition sources

• Its good stability and nontoxicity

• All of the above

Dry chemical extinguishing agents extinguish a fire by:

• Breaking up the molecular chain reaction

• Removing the fuel by absorbing the heated vapors

• Cooling the fuel below ignition temperature

• Smothering and removing the oxygen from the fuel

The total available supply of CO₂ for use in a fixed extinguishing system of a cargo vessel shall be at least sufficient for:

• All the spaces of the vessel

• All cargo spaces

• Space requiring largest amount

• Engine room and largest cargo space