COMPETENCE 12

50問 • 2年前

問題一覧

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

the space requiring the largest amount

By definition, spontaneous combustible is a result of_________.

chemical reactions within a substance

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?

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

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

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

dry chemical

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

Heat of oxidation

Firefighting foam is only effective when the foam ___________.

completely covers the top of the burning liquid

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

its good stability and nontoxicity

Dry chemical extinguishing agents extinguish a fire by _________.

breaking up the molecular chain reaction

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

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

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

oil

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

conducts electricity

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?

Foam

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

stop the pump immediately if it becomes vapor bound

Dry chemical extinguishing agents are effective when used ___________.

with any other dry chemical extinguishing agents

How does foam extinguish an oil fire?

By excluding the oxygen from the fire

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

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_______.

convection

Extinguishing oil fire is very effective when__________.

cutting off oxygen source

Fire alarm system thermostats are actuated by_________.

the difference in thermal expansion of two dissimilar metals

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

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

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

CO2

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

over an electrically heated platinum filament

Which of the following statements concerning chemical foam is TRUE?

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

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 ____________.

mechanical foam

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

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 ________.

landing area and sources of vapor ignition

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

Within a closed space

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

Suffocation

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

foam chemical with air and water

A fire is considered 'under control' when_________________ .

the fire is contained and no longer spreading

A fire is considered 'under control' when_________.

the fire is contained and no longer spreading

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

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 __________.

put the vessel's stern into the wind

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

Class "A"

A galley grease fire would be classified as .

Class B

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

Class B

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

class A

Foam extinguishes fire by_____.

smothering

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

magnesium

Fuel vents are fitted with corrosion resistant screen to prevent________.

flames entering the tank vent

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

Water

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

After the metal surfaces have cooled down.

Annual servicing of a hand portable CO2 fire extinguisher includes_____________

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

How often shall crew members participate in fire drills?

once every month

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

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

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

at a vertical surface

COMPETENCE 1

Peter j Zuniega · 50問 · 2年前

COMPETENCE 1