STCW Basic Fire Fighting Questions With
Complete Solutions
Fire Triangle - Correct Answer Oxygen, Heat, Fuel
Types of Fuel and Combustion:
Liquid Fuels - Correct Answer Vaporization - is the release of liquid's molecules into
the atmosphere, when vapors reach the *Flashpoint they ignite
Types of Fuel and Combustion:
Volatility - Correct Answer - Indicates the ability of a liquid to liberate into a gas
- The lower the boiling point, the more volatile
Types of Fuel and Combustion:
Flame Point - Correct Answer The lowest temperature at which the liquid emits
adequate gas to ignite with a flame.
(May be a light flicker because the liquid does not emit enough gas to keep the fire
alive)
Types of Fuel and Combustion:
Combustive point - Correct Answer The temperature where the liquid will emit so much
gas, that if ignited, it will continue to burn
Types of Fuel and Combustion:
Self-Ignition Point - Correct Answer The temperature at which the gas/air mixture will
start to burn by itself without being ignited by a flame or a spark
Categories of Combustion:
Spontaneous Ignition - Correct Answer Occurs when a substance heats up and ignites
itself without any external heat source
Ex. fish flour, chemical substances, rags, waste from oil/paint and copra (coconut oil)
Categories of Combustion:
Inflammable Materials - Correct Answer The material will ignite with a match and
continue to burn after ignition
Ex. paper, wood, textiles
Categories of Combustion:
, Non-flammable Materials - Correct Answer Need a large supply of heat before it
ignites and will extinguish itself if the external heat source is removed
Ex. Wool, plaster, certain plastic products
Backdraft - Correct Answer A fire explosion when air is rapidly introduced to an oxygen
deficient space, increasing safety risk to fire fighters
Class A Fire - Correct Answer - Ordinary Combustible Fires
- Ex. Wood, paper, plastic and everything that leaves behind ash when burned
- Primary extinguishing agent: water (cools fuel below ignition point) and dry chemicals
Class B Fire - Correct Answer - Flammable Liquid fires
- Ex. Gasoline, petroleum greases, tars, oils, oil-based paints, solvents, alcohols, and
flammable gases like butane and propane
- Primary extinguishing agent: foam; or CO2 or dry chemicals
Class C Fire - Correct Answer - Energized electrical fires
- to extinguish, secure power and use an extinguishing agent for the burning type of
fuel. CO2 or dry chemical extinguishers can be used.
Class D Fire - Correct Answer - Metal fires
- Ex. Burning metals, magnesium, sodium, and lithium
- Extinguish with a salt-based or sand-based powder
- Do not use water.
Class K - Correct Answer - Cooking oils and fats
- Ex. vegetable oil, animal oil, or fats in cooking appliances
- Class K fire extinguisher (commercial kicthens)
To Extinguish a fire, you must: - Correct Answer Remove one side of the fire
tetrahedron by:
- Removing the fuel: turning valve off to stop fuel supply
- Reduce the heat: use water to cool products below their ignition temp
- Remove the oxygen: use lid to over cooking pan
- Remove chemical chain reaction: use dry chemical extinguisher to separate the fuel,
oxygen, and heat
Conduction - Correct Answer The transfer of heat through and between solid
conductors like metal that transfer heat well
Convection - Correct Answer The spread of heat through thermal energy using water
and air currents called fluid motion
Radiation - Correct Answer The spread of heat through space
Spreads in all directions until it reaches a solid object
Radiated heat can pass though glass and ignite combustible materials on the other side
Complete Solutions
Fire Triangle - Correct Answer Oxygen, Heat, Fuel
Types of Fuel and Combustion:
Liquid Fuels - Correct Answer Vaporization - is the release of liquid's molecules into
the atmosphere, when vapors reach the *Flashpoint they ignite
Types of Fuel and Combustion:
Volatility - Correct Answer - Indicates the ability of a liquid to liberate into a gas
- The lower the boiling point, the more volatile
Types of Fuel and Combustion:
Flame Point - Correct Answer The lowest temperature at which the liquid emits
adequate gas to ignite with a flame.
(May be a light flicker because the liquid does not emit enough gas to keep the fire
alive)
Types of Fuel and Combustion:
Combustive point - Correct Answer The temperature where the liquid will emit so much
gas, that if ignited, it will continue to burn
Types of Fuel and Combustion:
Self-Ignition Point - Correct Answer The temperature at which the gas/air mixture will
start to burn by itself without being ignited by a flame or a spark
Categories of Combustion:
Spontaneous Ignition - Correct Answer Occurs when a substance heats up and ignites
itself without any external heat source
Ex. fish flour, chemical substances, rags, waste from oil/paint and copra (coconut oil)
Categories of Combustion:
Inflammable Materials - Correct Answer The material will ignite with a match and
continue to burn after ignition
Ex. paper, wood, textiles
Categories of Combustion:
, Non-flammable Materials - Correct Answer Need a large supply of heat before it
ignites and will extinguish itself if the external heat source is removed
Ex. Wool, plaster, certain plastic products
Backdraft - Correct Answer A fire explosion when air is rapidly introduced to an oxygen
deficient space, increasing safety risk to fire fighters
Class A Fire - Correct Answer - Ordinary Combustible Fires
- Ex. Wood, paper, plastic and everything that leaves behind ash when burned
- Primary extinguishing agent: water (cools fuel below ignition point) and dry chemicals
Class B Fire - Correct Answer - Flammable Liquid fires
- Ex. Gasoline, petroleum greases, tars, oils, oil-based paints, solvents, alcohols, and
flammable gases like butane and propane
- Primary extinguishing agent: foam; or CO2 or dry chemicals
Class C Fire - Correct Answer - Energized electrical fires
- to extinguish, secure power and use an extinguishing agent for the burning type of
fuel. CO2 or dry chemical extinguishers can be used.
Class D Fire - Correct Answer - Metal fires
- Ex. Burning metals, magnesium, sodium, and lithium
- Extinguish with a salt-based or sand-based powder
- Do not use water.
Class K - Correct Answer - Cooking oils and fats
- Ex. vegetable oil, animal oil, or fats in cooking appliances
- Class K fire extinguisher (commercial kicthens)
To Extinguish a fire, you must: - Correct Answer Remove one side of the fire
tetrahedron by:
- Removing the fuel: turning valve off to stop fuel supply
- Reduce the heat: use water to cool products below their ignition temp
- Remove the oxygen: use lid to over cooking pan
- Remove chemical chain reaction: use dry chemical extinguisher to separate the fuel,
oxygen, and heat
Conduction - Correct Answer The transfer of heat through and between solid
conductors like metal that transfer heat well
Convection - Correct Answer The spread of heat through thermal energy using water
and air currents called fluid motion
Radiation - Correct Answer The spread of heat through space
Spreads in all directions until it reaches a solid object
Radiated heat can pass though glass and ignite combustible materials on the other side
