IFSTA 7th Edition Chapter 4: Fire Dynamics Questions and Correct Answers (Graded A)
True or False: Oxidizers affect a fire because they are combustible - ANSWER-False. Oxidizers are not combustible but will support or enhance combustion
Physical science is the study of what two things? - ANSWER-Matter and energy
Oxidation - ANSWER-A chemical reaction involving the combination of an oxidizer, such
as oxygen in the air, with other materials.
Energy - ANSWER-The capacity to perform work
Work - ANSWER-This occurs when a force is applied to an object over a distance or when a substance undergoes a chemical, biological, or physical change. In the case of heat, work means increasing a substance's temperature
Potential Energy - ANSWER-The amount of energy that an object can release at some point in the future. Stored energy
Heat of Combustion - ANSWER-The potential energy available for release in the combustion process
Kinetic Energy - ANSWER-The energy that a moving object possesses
What are the 7 types of energy? - ANSWER-Chemical
Thermal
Mechanical
Electrical
Light
Nuclear
Sound
How is energy measured in the International System of Units (SI)? - ANSWER-With joules
How many joules is required to change the temperature of 1 gram of water by 1 degree Celsius? - ANSWER-4.2J In the customary system, the unit of measurement for heat is what? - ANSWER-The British Thermal Unit (Btu)
What is the British thermal unit? - ANSWER-The amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit
1 Btu equals how many joules? - ANSWER-1055 J
Exothermic Reactions - ANSWER-Reactions that emit energy as they occur
Endothermic Reactions - ANSWER-Reactions that absorb energy as they occur
What are the 3 elements to the Fire Triangle? - ANSWER-Fuel, Oxygen, Heat
What are the 4 elements to the Fire Tetrahedron? - ANSWER-Reducing Agent (Fuel), Oxidizing Agent, Heat, Chemical Chain Reaction
Pyrolysis - ANSWER-Off-gassing of a solid
Vaporization - ANSWER-Off-gassing off liquids
True or False: Both pyrolysis and vaporization are chemical changes - ANSWER-False. Pyrolysis is a chemical change from a solid to a gas, but vaporization is a physical change from a liquid to a gas
Piloted Ignition - ANSWER-The most common form of ignition. Occurs when a mixture of fuel and oxygen encounter an external heat source to ignite
Autoignition - ANSWER-Occurs without any external flame or spark to ignite the fuel gases or vapors
Autoignition temperature - ANSWER-The minimum temperature at which a fuel in the air must be heated in order to start self sustained combustion
True or False: The autoignition temperature of a substance is always higher than its piloted ignition temperature - ANSWER-True
Entrainment - ANSWER-The drawing in and transporting of solid particles or gases by the flow of a fluid
True or False: Smoke is a product of incomplete combustion - ANSWER-True
What does incomplete combustion mean? - ANSWER-Some of the fuel does not burn, but instead gets entrained with hot gases and rises aloft. This unburned fuel is smoke, and it has the potential to burn
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