IFSTA Chapter 4 Actual Exam Questions
With 100% Solved Answers Rated A+
c. Low oxygen concentrations alone can result in hypoxia or death. - ACCURATE
ANSWER-Which statement about the dangers of products of combustion is accurate?
a. Toxic products of combustion are released only during the combustion reaction.
b. The toxic effects of smoke inhalation are the result of the interaction between carbon
monoxide and heat.
c. Low oxygen concentrations alone can result in hypoxia or death.
d. Visible smoke presents the greatest inhalation danger.
b. Smoke explosion - ACCURATE ANSWER-What occurs when a mixture of unburned
fuel gases and oxygen come in contact with an ignition source?
a. Spontaneous ignition
b. Smoke explosion
c. Flashover
d. Radiant combustion
b. The water may disperse the burning liquid instead of extinguishing it. - ACCURATE
ANSWER-What may occur if water is added to a burning liquid that is less dense than
water?
a. The liquid fuel may vaporize much more rapidly as it draws thermal energy from the
water.
b. The water may disperse the burning liquid instead of extinguishing it.
c. The water will mix with the burning liquid and become less effective at extinguishing
the fire.
d. The fuel's rate of vaporization will decrease due to the increased water pressure.
b. an oxidizer. - ACCURATE ANSWER-Fires involve a heat producing chemical
reaction between fuel and:
a. a reducing agent.
,b. an oxidizer.
c. free radicals.
d. a catalyst.
c. chemical reaction. - ACCURATE ANSWER-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:
a. metamorphosis.
b. physiological change.
c. chemical reaction.
d. dissolution.
c. Chemical chain reaction - ACCURATE ANSWER-Which element of the fire
tetrahedron is included to explain flaming (gas-phase) combustion?
a. Oxygen
b. Heat
c. Chemical chain reaction
d. Fuel
c. neutral plane. - ACCURATE ANSWER-In a compartment fire, the interface between
the hot gas layers and cooler layer of air is commonly referred to as the:
a. zero balance plane.
b. neutral pressure interface.
c. neutral plane.
d. no pressure zone.
c. amount of oxygen available for combustion. - ACCURATE ANSWER-In most
compartment fires, the energy release in fire is directly proportional to the:
a. ambient temperature of the environment.
b. amount of fuel available for combustion.
, c. amount of oxygen available for combustion.
d. thermal conductivity of the fuel.
c. feels the increase in temperature as the velocity and/or turbulence increases. -
ACCURATE ANSWER-Firefighters working in the exhaust portion of the flow path will:
a. feel a decrease in temperature as air is entrained by the fire.
b. see visibility improve as turbidity and airflow increase.
c. feels the increase in temperature as the velocity and/or turbulence increases.
d. see waves of radiant heat emitting from the walls or ceiling.
b. how long each construction type maintains its structural integrity over a certain period
of time. - ACCURATE ANSWER-Most building codes rate construction types according
to:
a. the size of each compartment relative to the total square footage of the structure.
b. how long each construction type maintains its structural integrity over a certain period
of time.
c. the ratio of the typical number of occupants to the number of egress points.
d. the size, type, and capability of fire suppression systems.
b. oxygen-enriched. - ACCURATE ANSWER-Materials that burn at normal oxygen
levels will burn more intensely in _____ atmospheres.
a. flaming
b. oxygen-enriched
c. oxygen-deficient
d. nonflaming
d. Overcurrent or overload - ACCURATE ANSWER-Which type of electrical heating
occurs when the current flowing through a conductor exceeds its design limits?
a. Arcing
b. Friction heating
c. Sparking
With 100% Solved Answers Rated A+
c. Low oxygen concentrations alone can result in hypoxia or death. - ACCURATE
ANSWER-Which statement about the dangers of products of combustion is accurate?
a. Toxic products of combustion are released only during the combustion reaction.
b. The toxic effects of smoke inhalation are the result of the interaction between carbon
monoxide and heat.
c. Low oxygen concentrations alone can result in hypoxia or death.
d. Visible smoke presents the greatest inhalation danger.
b. Smoke explosion - ACCURATE ANSWER-What occurs when a mixture of unburned
fuel gases and oxygen come in contact with an ignition source?
a. Spontaneous ignition
b. Smoke explosion
c. Flashover
d. Radiant combustion
b. The water may disperse the burning liquid instead of extinguishing it. - ACCURATE
ANSWER-What may occur if water is added to a burning liquid that is less dense than
water?
a. The liquid fuel may vaporize much more rapidly as it draws thermal energy from the
water.
b. The water may disperse the burning liquid instead of extinguishing it.
c. The water will mix with the burning liquid and become less effective at extinguishing
the fire.
d. The fuel's rate of vaporization will decrease due to the increased water pressure.
b. an oxidizer. - ACCURATE ANSWER-Fires involve a heat producing chemical
reaction between fuel and:
a. a reducing agent.
,b. an oxidizer.
c. free radicals.
d. a catalyst.
c. chemical reaction. - ACCURATE ANSWER-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:
a. metamorphosis.
b. physiological change.
c. chemical reaction.
d. dissolution.
c. Chemical chain reaction - ACCURATE ANSWER-Which element of the fire
tetrahedron is included to explain flaming (gas-phase) combustion?
a. Oxygen
b. Heat
c. Chemical chain reaction
d. Fuel
c. neutral plane. - ACCURATE ANSWER-In a compartment fire, the interface between
the hot gas layers and cooler layer of air is commonly referred to as the:
a. zero balance plane.
b. neutral pressure interface.
c. neutral plane.
d. no pressure zone.
c. amount of oxygen available for combustion. - ACCURATE ANSWER-In most
compartment fires, the energy release in fire is directly proportional to the:
a. ambient temperature of the environment.
b. amount of fuel available for combustion.
, c. amount of oxygen available for combustion.
d. thermal conductivity of the fuel.
c. feels the increase in temperature as the velocity and/or turbulence increases. -
ACCURATE ANSWER-Firefighters working in the exhaust portion of the flow path will:
a. feel a decrease in temperature as air is entrained by the fire.
b. see visibility improve as turbidity and airflow increase.
c. feels the increase in temperature as the velocity and/or turbulence increases.
d. see waves of radiant heat emitting from the walls or ceiling.
b. how long each construction type maintains its structural integrity over a certain period
of time. - ACCURATE ANSWER-Most building codes rate construction types according
to:
a. the size of each compartment relative to the total square footage of the structure.
b. how long each construction type maintains its structural integrity over a certain period
of time.
c. the ratio of the typical number of occupants to the number of egress points.
d. the size, type, and capability of fire suppression systems.
b. oxygen-enriched. - ACCURATE ANSWER-Materials that burn at normal oxygen
levels will burn more intensely in _____ atmospheres.
a. flaming
b. oxygen-enriched
c. oxygen-deficient
d. nonflaming
d. Overcurrent or overload - ACCURATE ANSWER-Which type of electrical heating
occurs when the current flowing through a conductor exceeds its design limits?
a. Arcing
b. Friction heating
c. Sparking
