Chapter Test 4 IFSTA

Chapter Test 4 (IFSTA 7th Edition) Fires involve a heat-producing chemical reaction between fuel and: (117) [4.3.11]

• a catalyst.
• an oxidizer.
• free radicals.
• 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]

• dissolution.
• metamorphosis.
• chemical reaction.
• physiological change. - ANSWER
• chemical reaction

Which statement about energy and combustion is accurate? (120) [4.3.11]

• A fuel's chemical energy is the result of rapid vibrations in the molecules. 1 / 3

• Chemical and physical changes almost never involve an exchange of energy.
• A fuel's potential energy releases during combustion and converts to kinetic

energy.

• 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]

• Fuel
• Heat
• Oxygen
• Chemical chain reaction - ANSWER
• 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]

• Autoignition
• Piloted ignition
• Kinetic ignition
• Sustained ignition - ANSWER B.

Piloted ignition 2 / 3

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]

• autoignition temperature (AIT).
• piloted ignition temperature (PIT).
• lower explosive (flammable) limit (LEL).
• upper explosive (flammable) limit (UEL). - ANSWER
• autoignition temperature (AIT).

What causes flaming combustion to occur? (123) [4.3.11]

• A solid fuel encounters an open flame and entrain enough air to ignite.
• A gaseous fuel encounters an external heat source and experience piloted

ignition.

• A gaseous fuel mixes with an adequate amount of oxygen and heats to ignition

temperature.

• A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain

an open burning flame. - ANSWER

• 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]

• Injuries caused by falling materials or structural collapse
• Exposure to toxic gases found in smoke and/or lack of oxygen
• Exposure to extreme heat and/or contact with flames and hot surfaces
• Accidental injuries sustained during escape and/or evacuation procedures -

ANSWER B. Exposure to toxic gases found in smoke and/or lack of oxygen

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