Fire Inspector

Chapter 3

Knowledge Check

1. Which of the following is MOST correct about what occurs in a chemical reaction?

A chemical reaction occurs very slowly.

A chemical reaction only involves one substance.

A substance changes in size, shape, or appearance.

A substance changes from one type of matter into another.

2. What stage occurs as the fire consumes the available fuel in the compartment and the heat release rate begins to decline?

Decay

Growth

Incipient

Fully developed

3. Which of the following is a characteristic of flaming combustion?

Smoldering glow on the material's surface

Visible flames above the material's surface

Single color smoke above the material's surface

Puffs of black or gray smoke above the material's surface

4. Which type of ignition occurs when a mixture of fuel and oxygen encounter an external heat source with

fficient heat or thermal energy to start the combustion process?

Autoignition

Kinetic ignition

Piloted ignition

Primary ignition

5. Which of the following statements about vapor density is MOST accurate?

All gases are given a vapor density of 1.

Gases with a vapor density less than 1 will rise.

Gases with a vapor density greater than 1 will rise.

Gases may either rise or sink regardless of vapor density.

6. What is the minimum concentration of fuel vapor and air that supports combustion?

Minimum flash point

Maximum flash point

Upper flammable limit

Lower flammable limit

7. Which occurs with rapid oxidation?

Rust

Combustion

Smoldering

Vaporization

8. Which of the following statements about fires that develop beyond the incipient stage is MOST accurate?

They result in roll over.

They result in backdraft.

They become fuel controlled.

They become ventilation controlled.

9. Which of the following statements about combustible materials with high surface-to-mass ratios is MOST accurate?

They ignite but flame out quickly.

They are easily ignited and burn quickly.

They are difficult to ignite and burn slowly.

The surface-to-mass ratio has no effect on burning.

10. Converting water from a liquid to a gas requires:

a kinetic reaction.

an active reaction.

an exothermic reaction.

an endothermic reaction.

11. Which type of fire consists of vegetable-based oils and greases found in commercial kitchens?

Class A

Class C

Class D

Class K

12. During what stage will flames extend out of the compartment openings because there is insufficient oxygen for complete combustion in the compartment?

Decay

Growth

Incipient

Fully developed

13. Which of the following statements about fuel load is MOST accurate?

Fuel load cannot be accurately estimated.

Fuel load does not change within an occupancy.

Fuel load for occupancies can be absolutely determined.

Fuel load can be estimated using mathematical equations.

14. Which element was added to the basic fire model to create the fire tetrahedron?

Fuel

Heat

Oxygen

Uninhibited chemical reaction

15. Which type of heat transfer involves the transfer of thermal energy by the circulation or movement of a fluid (liquid or gas)?

Radiation

Convection

Conduction

Transmission

16. Which of the following statements about fires originating in upper levels of a building is MOST accurate?

They generally stay contained to upper levels.

They generally extend downward very quickly.

They are more unpredictable in their behavior.

They generally extend downward much more slowly.

17. Which source of heat is generated by friction or compression?

Light energy

Chemical energy

Electrical energy

Mechanical energy

18. Which of the following refers to the total amount of thermal energy released when a specific fuel amount is oxidized?

Heat release rate

Heat of reactivity

Heat of combustion

Realized heat energy

19. Which of the following would extinguish a fire under the simplest model of fire behavior?

Addition of oxygen

Removal of oxygen

Addition of solubles

Removal of pathways

20. Which type of fire requires foam/dry chemical as an extinguishing agent?

Class A

Class B

Class C

Class D

21. The energy that transfers from a high-temperature substance to a low-temperature substance is referred to as:

hot energy.

active energy.

thermal energy.

potential energy.

22. Which of the following statements about thermal layering is MOST accurate?

Generally, the cooler gases form the upper layer.

Generally, the cooler gases gravitate to the middle.

Generally, the hottest gases tend to be in the lower layer.

Generally, the hottest gases tend to be in the upper layers.

23. Reactions that give off energy are called:

kinetic.

exothermic.

endothermic.

active reactions.

24. What is the temperature at which sufficient vapors are generated to sustain the combustion reaction?

Fire point

Flash point

Vapor point

Flame point

25. Which of the following refers to energy released per unit of time as a fuel burns?

Heat release rate

Heat of reactivity

Heat of combustion

Realized heat energy

26. Which is an example of a hydrocarbon-based fuel?

Paper

Wood

Plastics

Gypsum board

27. Which of the following is a characteristic of polar solvents?

They react with water.

They will sink in water.

They will not mix with water.

They will mix readily with water.

28. During which stage does fire begin to influence the environment within the compartment?

Decay

Growth

Incipient

Fully developed

29. What stage of fire growth is largely dependent on the characteristics and configuration of the fuel involved (fuel-controlled fire)?

Decay

Growth

Incipient

Fully developed

30. Which of the following refers to unintended resistance heating?

Arcing

Sparking

Smoldering

Overcurrent or overload

Fire Inspector

Chapter 3

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