Chapter 4: Fire Dynamics Study Review
Test.
ifsta chpt 4 :
fire dynamics test questions (75) - CORRECT ANSWER ifsta chpt. 4 :
fire Dynamics test answers
What may occur if water is added to a burning liquid that is less dense than water? - CORRECT ANSWER
the water may disperse the burning liquid instead of extinguishing it.
How does the self-sustained chemical reaction influence the oxidation reaction in flaming combustion? -
CORRECT ANSWER Increases the ratio of complete to incomplete combustion of fuel
Which type of electrical heating occurs when the current flowing through a conductor exceeds its design
limits? - CORRECT ANSWER overcurrent or overload
What will a liquid with a specific gravity less than one do when combined with water - CORRECT
ANSWER float
To ensure that the decay stage of a ventilation-limited fire is the fire's final stage, firefighters must
provide a controlled transition of a fire in the decay stage from ventilation-limited to fuel-limited, by: -
CORRECT ANSWER cooling the hot fire gases before the ventilation occurs.
What occurs during flashover? - CORRECT ANSWER the volume of burning gases can increase to fill the
rooms entire volume and extend out of any openings from the room.
In a compartment fire, smoke flashover indicators include rapidly increasing volume, turbulence, optical
density, and: - CORRECT ANSWER darkening color
, in the fire environment convection usually involves the transfer of heat through - CORRECT ANSWER the
movement of hot smoke and fire gases
Materials that burn at normal oxygen levels will burn more intensely in _____ atmospheres. - CORRECT
ANSWER oxygen- enriched
A fuel's chemical content influences its heat release rate and its: - CORRECT ANSWER heat of
combustion
What is the most effective means of establishing awareness of hazards in commercial, industrial, and
storage facilities with large fuel loads? - CORRECT ANSWER performing and updating preincident plan
Which type of buildings are subject to rapid fire spread because many of the protective features such as
gypsum wallboard and automatic fire suppression systems are not in place? - CORRECT ANSWER
buildings under construction
When a substance changes from one type of matter into another, such as two or more substances
combining to form compounds, the substance undergoes a: - CORRECT ANSWER chemical reaction
Which action will transition a compartment fire in a modern structure from ventilation-limited to fuel-
limited? - CORRECT ANSWER Extinguishing some of the fuel
Which heat transfer mechanism is dependent on several factors including the turbulence and velocity of
moving gases? - CORRECT ANSWER convection
What is the MOST common source of heat in combustion reactions? - CORRECT ANSWER chemical
energy
A fire is said to be in the _____ stage when it runs out of either available fuel or available oxygen. -
CORRECT ANSWER decay
Which is an indicator for potential backdraft? - CORRECT ANSWER pulsing smoke movement around
small opening in the buidling
Test.
ifsta chpt 4 :
fire dynamics test questions (75) - CORRECT ANSWER ifsta chpt. 4 :
fire Dynamics test answers
What may occur if water is added to a burning liquid that is less dense than water? - CORRECT ANSWER
the water may disperse the burning liquid instead of extinguishing it.
How does the self-sustained chemical reaction influence the oxidation reaction in flaming combustion? -
CORRECT ANSWER Increases the ratio of complete to incomplete combustion of fuel
Which type of electrical heating occurs when the current flowing through a conductor exceeds its design
limits? - CORRECT ANSWER overcurrent or overload
What will a liquid with a specific gravity less than one do when combined with water - CORRECT
ANSWER float
To ensure that the decay stage of a ventilation-limited fire is the fire's final stage, firefighters must
provide a controlled transition of a fire in the decay stage from ventilation-limited to fuel-limited, by: -
CORRECT ANSWER cooling the hot fire gases before the ventilation occurs.
What occurs during flashover? - CORRECT ANSWER the volume of burning gases can increase to fill the
rooms entire volume and extend out of any openings from the room.
In a compartment fire, smoke flashover indicators include rapidly increasing volume, turbulence, optical
density, and: - CORRECT ANSWER darkening color
, in the fire environment convection usually involves the transfer of heat through - CORRECT ANSWER the
movement of hot smoke and fire gases
Materials that burn at normal oxygen levels will burn more intensely in _____ atmospheres. - CORRECT
ANSWER oxygen- enriched
A fuel's chemical content influences its heat release rate and its: - CORRECT ANSWER heat of
combustion
What is the most effective means of establishing awareness of hazards in commercial, industrial, and
storage facilities with large fuel loads? - CORRECT ANSWER performing and updating preincident plan
Which type of buildings are subject to rapid fire spread because many of the protective features such as
gypsum wallboard and automatic fire suppression systems are not in place? - CORRECT ANSWER
buildings under construction
When a substance changes from one type of matter into another, such as two or more substances
combining to form compounds, the substance undergoes a: - CORRECT ANSWER chemical reaction
Which action will transition a compartment fire in a modern structure from ventilation-limited to fuel-
limited? - CORRECT ANSWER Extinguishing some of the fuel
Which heat transfer mechanism is dependent on several factors including the turbulence and velocity of
moving gases? - CORRECT ANSWER convection
What is the MOST common source of heat in combustion reactions? - CORRECT ANSWER chemical
energy
A fire is said to be in the _____ stage when it runs out of either available fuel or available oxygen. -
CORRECT ANSWER decay
Which is an indicator for potential backdraft? - CORRECT ANSWER pulsing smoke movement around
small opening in the buidling
