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Chapter Test 4 (IFSTA 7th Edition) Practice Questions and Answers (100% Pass)
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Chapter Test 4 (IFSTA 7th Edition) Practice Questions and Answers (100% Pass)
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©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Thursday, August 1, 2024 11:09 AMChapter Test 4 (IFSTA 7th Edition) Practice
Questions and Answers (100% Pass)
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. - ✔️✔️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. - ✔️✔️C. chemical reaction
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,©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Thursday, August 1, 2024 11:09 AM
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. - ✔️✔️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 - ✔️✔️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
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, ©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Thursday, August 1, 2024 11:09 AM
D. Sustained ignition - ✔️✔️B. Piloted ignition
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).
D. upper explosive (flammable) limit (UEL). - ✔️✔️A. autoignition temperature (AIT).
What causes flaming combustion to occur? (123) [4.3.11]
A. A solid fuel encounters an open flame and entrain enough air to ignite.
B. A gaseous fuel encounters an external heat source and experience piloted ignition.
C. A gaseous fuel mixes with an adequate amount of oxygen and heats to ignition
temperature.
D. A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an
open burning flame. - ✔️✔️C. A gaseous fuel mixes with an adequate amount of oxygen
and heats to ignition temperature.
What is the cause of most fire deaths? (124) [4.3.10, 4.3.11]
A. Injuries caused by falling materials or structural collapse
B. Exposure to toxic gases found in smoke and/or lack of oxygen
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