C-12

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

All the spaces of a vessel

All cargo spaces

The engine room and largest cargo space

The space requiring the largest amount

By definition, spontaneous combustible is a result of_________.

Conduction of heat through a wall of material to the substance

An outside heat source heating a substance until it ignites

Chemical reactions within a 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?

Chemical foam

Mechanical foam

High velocity fog

Low velocity fog

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?

Steam smothering system

Dry chemical

CO2

Aqueous film forming 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 ___________.

Dry chemical

Halon 1301

Water fog

Carbon dioxide

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

Latent heat of sublimation

Heat of expansion

Heat of oxidation

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

Mixes with the burning fuel oil

Is kept saturated with low velocity water fog

The advantage of using a dry chemical fire extinguishing agent is _________.

Permanent extinguishment reguardless of the reignition sources

Its excellent cooling ability

Its good stability and nontoxicity

All of the above

Dry chemical extinguishing agents extinguish a fire by _________.

Smothering and removing the oxygen from the fuel

Breaking up the molecular chain reaction

Removing the fuel by absorbing the heated vapors

Cooling the fuel below ignition temperature

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 space of the vessel

Engine room and largest cargo space

All cargo‐space

Space requiring largest amount

On an inspection of your tankship you notice that there are no portable fire extinguishers in the pumproom. To comply with regulations, you __________.

Should arrange to have a B‐II extinguisher placed in the lower pumproom

Need not be concerned since no portable extinguishers are required in the pumproom

May substitute sand for the required extinguishers

Should arrange to have a B‐II extinguisher placed in the vicinity of the exit

Chemical foam is most suitable for use on a fire involving _____________.

Burning insulation

Hot bulkheads

Oil

Electrical machinery

One of the limitations of foam as a fire extinguishing agent is that foam ________.

Cannot be made with salt water

Conducts electricity

Is heavier than oil and sinks below it surface

Is corrosive and a hazard to fire fighters

The use of which type of fire extinguishing agent involves covering the burning surface by deflecting the agent from a bulkhead to avoid undue agitation?

Halon 1301

Carbon dioxide

Dry chemical

Foam

If flammable liquids are being pumped with a centrifugal pump, you should_______.

Throttle the discharge valve to assure positive pumping

Stop the pump immediately if it becomes vapor bound

Throttle the discharge valve to control capacity

Gag relief valves to prevent recirculating and heating of the liquid

Dry chemical extinguishing agents are effective when used ___________.

With any foam extinguishing agents

Strictly in a cooling capacity

With any other dry chemical extinguishing agents

On materials that contain their own oxygen

How does foam extinguish an oil fire?

By excluding the oxygen from the fire

By cooling the oil below the ignition temperature

By removing the fuel source from the fire

By increasing the weight of the oil

Except in rare cases, it is impossible to extinguish a shipboard fire by __________.

. Interrupting the chain reaction

Removing the oxygen

Removing the heat

Removing the fuel

In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by_______.

Ventilation

Radiation

Convection

Conduction

Extinguishing oil fire is very effective when__________.

Cooling below its ignition temperature

Cutting off oxygen source

Spraying with water

Removing fuel

Fire alarm system thermostats are actuated by_________.

The difference in thermal expansion of two dissimilar metals

An electric eye which actuates when smoke interferes with the beam

Smoke sensors

Pressure loss due to air being heated

Valves on steam‐smothering lines to cargo tanks shall be set with __________.

The master control valve shut and valves to individual cargo tanks open

The master control valve open and valves to individual cargo tanks shut

The master control valve shut and valves to individual cargo tanks shut

All valves open

Which extinguishing agent is most likely to allow reflash as a result of not cooling the fuel below its ignition temperature?

Water spray

Foam

CO2

Water stream

Combustible gas indicator is operated by drawing an air sample into the instrument_______.

Where its specific gravity is measured

Over an electrically heated platinum filament

Where it is ignited by a sparking device

Where it is mixed with nitrogen

Which of the following statements concerning chemical foam is TRUE?

It is formed as a result of the reaction between dry powder and water.

It is recommended for use on fires in main propulsion electric motors.

Foam bubbles are formed as a result of mechanical mixing with air.

It is useful in fighting chemicals fires only.

A fire extinguishing product produced by first mixing a foam concentrate with water to produce a foam solution, then mixing the foam solution with air is termed ____________.

Chemical foam

Halon 1301

Mechanical foam

Light water

When an electrical fire has been extinguished with a dry chemical agent, there is always a possibility of the __________.

Chemical crystals suffocating the fire fighter

Machinery suffering thermal shock damage

Fire being rekindled by spontaneous combustion

Electrical contacts or relays being rendered inoperative

Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the ________.

Main deck

Drill floor

Engine room

Landing area and sources of vapor ignition

In which of the circumstances listed would a carbon dioxide fire extinguishing agent be most effective?

As a cooling agent

Within a closed space

On a magnesium fire

At a range of 15 feet

What danger to personnel exists when a carbon dioxide fire extinguisher is discharged in a small enclosed space?

Burst eardrums

Second degree burns

Suffocation

Electric shock

Mechanically foam used for firefighting is produced by mechanically mixing and agitating ___________.

Foam chemical with air and water

Dry chemical and water

Soda acid and water

Bicarbonate soda with air and water

A fire is considered 'under control' when_________________ .

The fire is contained and no longer spreading

Vall firefighting equipment is at the scene

The fixed systems are activated

All hands are at their fire stations

A fire is considered 'under control' when_________.

All firefighting equipment is at the scene

All hands are at their fire stations

The fixed systems are activated

The fire is contained and no longer spreading

A definite advantage of using water as a fire extinguishing agent is its characteristic of __________.

Rapid contraction as water is converted from a liquid to a vapor

Absorption of smoke and gases as water is converted from a liquid to a vapor

Alternate expansion and contraction as water in a liquid state becomes a vapor

Rapid expansion as water absorbs heat and changes to steam

You are underway when a fire breaks out in the forward part of your vessel. If possible you should __________.

Abandon ship to windward

Put the vessel's stern into the wind

Keep going at half speed

Call for assistance

A burning mattress is considered as which of the following classes of fire?

Class "D"

Class "C"

Class "A"

Class "B"

Which of the following classes of fire would probably occur in the engine room bilges?

Class D

Class B

Class A

Class C

A fire in a pile of dunnage would be classified as a_______.

Class B

Class A

Class C

Class D

A class "D" fire would involve the burning of__________.

Magnesium

Diesel oil

Electrical insulation

Dunnage

Fuel vents are fitted with corrosion resistant screen to prevent________.

Corrosion in the tank vent

Escape of flammable vapors

Flames entering the tank vent

Damage to the ball check

Which fire extinguishing agent has the greatest capacity for absorbing heat?

Dry chemical

Carbon dioxide

Foam

Water

When is the best time to vent the combustible products from the engine room after CO2 fire extinguishing system has released?

One half‐hour after the fire is extinguished.

After any personnel in fireman outfits reenter the engine room.

Immediately after the fire is extinguished.

After the metal surfaces have cooled down.

Annual servicing of a hand portable CO2 fire extinguisher includes_____________ .

Discharging, cleaning inside, and recharging

Inspecting the pressure gauge to ensure the needle is within operating range

Hydrostatic testing of the cylinder

Weighing the cylinder and recharging if weight loss exceeds 10% of the weight of the charge

Except in rare cases, it is impossible to extinguish a shipboard fire by________.

Removing the fuel

Interrupting the chain reaction

Removing the oxygen

Removing the heat

How often shall crew members participate in fire drills?

Once every 6 months

Once every month

Once every year

Once every week

You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________.

At the main body of the fire

Over the top of the fire

At the seat of the fire, starting at the near edge

To bank off a bulkhead onto the fire

When using mechanical foam to fight a bilge fire, the stream of foam is most effective when directed ___________.

At a vertical surface

At the overhead

Onto the deck

Directly into the bilge water

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