Chapter 4 (IFSTA 7th Edition)|
latest|COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS (100% Correct
solutions
Fires involve a heat-producing chemical reaction between fuel and: (117) [4.3.11]
A. a catalyst.
B. an oxidizer.
C. free radicals.
D. a reducing agent. - Answer--B. an oxidizer
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: (118) [4.3.11]
A. dissolution.
B. metamorphosis.
C. chemical reaction.
D. physiological change. - Answer--C. chemical reaction
Which statement about energy and combustion is accurate? (120) [4.3.11]
,A. A fuel's chemical energy is the result of rapid vibrations in the molecules.
B. Chemical and physical changes almost never involve an exchange of energy.
C. A fuel's potential energy releases during combustion and converts to kinetic energy.
D. Chemical changes involve an exchange of energy; physical changes involve no energy exchange. -
Answer--C. A fuel's potential energy releases during combustion and converts to kinetic energy.
Which element of the fire tetrahedron is included to explain flaming (gas-phase) combustion? (120)
[4.3.11]
A. Fuel
B. Heat
C. Oxygen
D. Chemical chain reaction - Answer--D. Chemical chain reaction
What occurs when a mixture of fuel and oxygen encounter an external heat source with sufficient heat
or thermal energy to start the combustion reaction? (120) [4.3.11]
A. Autoignition
B. Piloted ignition
C. Kinetic ignition
D. Sustained ignition - Answer--B. Piloted ignition
Which product of combustion acts as a chemical asphyxiant by excluding oxygen from the blood, leading
to hypoxia of the brain and tissues? (124-125) [4.3.11]
A. Carbon dioxide (C02)
B. Carbon monoxide (CO)
C. Aerosolized fuel particles
D. Hydrogen cyanide (HCN) - Answer--B. Carbon monoxide (CO)
Hydrogen cyanide (HCN) is a product of combustion that: (126) [4.3.11]
, A. is equally as toxic as carbon monoxide (CO).
B. is released when wood and other natural materials are burned.
C. targets the brain after being inhaled, ingested, or absorbed into the body.
D. acts as a respiratory stimulant, increasing respiratory rate and increasing oxygen to blood cells. -
Answer--C. targets the brain after being inhaled, ingested, or absorbed into the body
How does a compartment fire affect pressure in and around gases in the compartment? (127) [4.3.11]
A. Heat from a fire increases the pressure of the surrounding gases.
B. Gases move from areas of lower pressure to areas of higher pressure.
C. At standard temperature and atmospheric pressure, gases circulate at a steady, uniform rate.
D. Significant differences in pressure, typically 10 kPa or greater, are required to cause movement of
gases in a compartment. - Answer--A. Heat from a fire increases the pressure of the surrounding gases.
What is the measurement of the average kinetic energy in the particles of a sample of matter? (127)
[4.3.11]
A. Heat
B. Wattage
C. Temperature
D. Candlepower - Answer--C. Temperature
The minimum temperature at which a fuel in the air must be heated in order to start self-sustained
combustion is known as the: (122) [4.3.11]
A. autoignition temperature (AIT).
B. piloted ignition temperature (PIT).
C. lower explosive (flammable) limit (LEL).
latest|COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS (100% Correct
solutions
Fires involve a heat-producing chemical reaction between fuel and: (117) [4.3.11]
A. a catalyst.
B. an oxidizer.
C. free radicals.
D. a reducing agent. - Answer--B. an oxidizer
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: (118) [4.3.11]
A. dissolution.
B. metamorphosis.
C. chemical reaction.
D. physiological change. - Answer--C. chemical reaction
Which statement about energy and combustion is accurate? (120) [4.3.11]
,A. A fuel's chemical energy is the result of rapid vibrations in the molecules.
B. Chemical and physical changes almost never involve an exchange of energy.
C. A fuel's potential energy releases during combustion and converts to kinetic energy.
D. Chemical changes involve an exchange of energy; physical changes involve no energy exchange. -
Answer--C. A fuel's potential energy releases during combustion and converts to kinetic energy.
Which element of the fire tetrahedron is included to explain flaming (gas-phase) combustion? (120)
[4.3.11]
A. Fuel
B. Heat
C. Oxygen
D. Chemical chain reaction - Answer--D. Chemical chain reaction
What occurs when a mixture of fuel and oxygen encounter an external heat source with sufficient heat
or thermal energy to start the combustion reaction? (120) [4.3.11]
A. Autoignition
B. Piloted ignition
C. Kinetic ignition
D. Sustained ignition - Answer--B. Piloted ignition
Which product of combustion acts as a chemical asphyxiant by excluding oxygen from the blood, leading
to hypoxia of the brain and tissues? (124-125) [4.3.11]
A. Carbon dioxide (C02)
B. Carbon monoxide (CO)
C. Aerosolized fuel particles
D. Hydrogen cyanide (HCN) - Answer--B. Carbon monoxide (CO)
Hydrogen cyanide (HCN) is a product of combustion that: (126) [4.3.11]
, A. is equally as toxic as carbon monoxide (CO).
B. is released when wood and other natural materials are burned.
C. targets the brain after being inhaled, ingested, or absorbed into the body.
D. acts as a respiratory stimulant, increasing respiratory rate and increasing oxygen to blood cells. -
Answer--C. targets the brain after being inhaled, ingested, or absorbed into the body
How does a compartment fire affect pressure in and around gases in the compartment? (127) [4.3.11]
A. Heat from a fire increases the pressure of the surrounding gases.
B. Gases move from areas of lower pressure to areas of higher pressure.
C. At standard temperature and atmospheric pressure, gases circulate at a steady, uniform rate.
D. Significant differences in pressure, typically 10 kPa or greater, are required to cause movement of
gases in a compartment. - Answer--A. Heat from a fire increases the pressure of the surrounding gases.
What is the measurement of the average kinetic energy in the particles of a sample of matter? (127)
[4.3.11]
A. Heat
B. Wattage
C. Temperature
D. Candlepower - Answer--C. Temperature
The minimum temperature at which a fuel in the air must be heated in order to start self-sustained
combustion is known as the: (122) [4.3.11]
A. autoignition temperature (AIT).
B. piloted ignition temperature (PIT).
C. lower explosive (flammable) limit (LEL).
