Chapter 05e

advertisement
Chapter 05e
1. What is the method of fire suppression most widely used on Class A combustibles?
A. Cooling
B. Removal of fuel
C. Smothering
D. Inhibition of chain reaction
2. Water is the primary fire extinguishing agent because of its:
A. temperature coefficient and surface tension.
B. purity and low toxicity.
C. ability to absorb heat.
D. flexibility and tendency to evaporate slowly.
3. When exposed to products of combustion, the____ are more vulnerable to injury than any other body
area.
A. lungs and respiratory tract
B. heart and respiratory tract
C. lungs and eyes
D. brain and spinal cord
4. Convection is:
A. transfer of heat through space by infrared rays.
B. transfer of heat through a solid medium.
C. not considered a method of heat transfer.
D. transfer of heat through liquids or gases by circulating currents.
5. Combustion is the result of a ____ reaction.
A. mechanical
B. chemical
C. dielectrical
D. replenishment
6. A fire in the presence of a higher-than-normal concentration of oxygen will:
A. burn slower than normal.
B. burn faster than normal.
C. not be effected by the oxygen.
D. not burn if oxygen is too rich.
7. ______ is described as the point-to-point transmission of heat energy.
A. Conduction
B. Radiation
C. Convection
D. Flashover
8. The chemical decomposition of a substance through the action of heat best defines:
A. oxidation.
B. pyrolysis.
C. boiling point
D. heat of decompression.
9. ______ is the transition between the growth and fully developed stages of fire.
A. Flashover
B. Backdraft
C. Flash point
D. Ignition temperature
10. The term vapor density refers to the weight of a gas as compared to the weight of:
A. water.
B. air.
C. carbon.
D. nitrogen
11. The product of combustion is measured in degrees of temperature to signify intensity of:
A. heat.
B. flame.
C. smoke.
D. calories.
12. Pyrolysis is defined as:
A. a chemical reaction that produces heat.
B. the concentration level of a substance at which it will support ignition and continuous burning.
C. a state where a balance had occurred in a mixture.
D. decomposition of transformation of a compound caused by heat.
13. Combustion is:
A. the point at which the need for outside heat application ceases and a material sustains
combustion based on its own generation of heat.
B. a chemical reaction that liberates heat.
C. the chemical action producing heat and light in which the heat maintains the chemical
chain reaction continuing the process.
D. the concentration level of a substance at which it will burn.
14. The fire triangle is composed of:
A. heat, chemical reaction, fuel.
B. heat, fuel, and oxygen.
C. oxygen, nitrogen, and fuel.
D. fuel, oxygen, LEL.
15. Backdraft is:
A. a boiling liquid/expanding vapor explosion.
B. a layer of air that has the same temperature.
C. the rapid ignition of smoke.
D. flames moving through the unburned gases during a fire?s progression.
16. Pyrolysis is associated with which of the following sources of heat?
A. Electrical
B. Nuclear
C. Mechanical
D. Chemical
17. If a gas has a vapor density greater than one when it escapes from its container:
A. it will rise.
B. its movement will be dependent on wind direction and speed.
C. its movement will be dependent on temperature.
D. it will sink and collect at low points.
18. The recommended method to prevent a back draft explosion is_____ ventilation.
A. side
B. lateral
C. vertical
D. passive
19. The phase of fire characterized by temperature decline and diminishing fire is called:
A. ignition.
B. growth.
C. fully developed.
D. decay.
20. When the colder of two bodies in contact absorbs heat until both objects are the same temperature,
_______ has taken place.
A. specific heat equalization
B. heat transfer
C. latent heat vaporization
D. osmosis transfer
21. The principle which most closely describes how water extinguishes fire is:
A. removal of fuel.
B. reduction of temperature.
C. exclusion of oxygen.
D. inhibition of chain reaction.
22. A product of combustion that contains a mixture of oxygen, hydrogen cyanide, CO2, CO, and finely
divided carbon particles is:
A. heat.
B. flame.
C. smoke.
D. vapor.
23. The movement of heat through a steel beam to an unexposed part of a building where it starts another
fire is an example of:
A. conduction.
B. radiation.
C. convection.
D. direct-flame contact.
24. The ____ stage occurs when all combustible materials in the compartment are involved in the fire.
A. ignition
B. growth
C. flashover
D. fully-developed
25. Ignition is:
A. the term used to denote a place where heat is drained away from a source.
B. the ability of a material to sustain combustion.
C. a catalyst in the breakdown of molecules.
D. a chemical reaction that absorbs heat.
26. Which type of heat transfer is a major contributor to flashover?
A. Radiation
B. Conduction
C. Convection
D. Nuclear
27. Horizontal extension of fire includes all of the following means of heat transfer except through:
A. wall openings by direct flame contact.
B. open space by radiant heat.
C. ceilings and floors by direct flame contact.
D. walls by conduction of heat through pipes.
28. What kind of heat energy is the heat of compression?
A. Chemical
B. Electrical
C. Mechanical
D. Nuclear
29. Ignition temperature is the minimum temperature required to:
A. cause a fuel to give off vapors in sufficient quantities to form an ignitable mixture with air.
B. heat a fuel which will produce vapors sufficient to support combustion once ignited.
C. heat a fuel to begin self-sustained combustion independent of the heating source.
D. change a liquid to a gas without introducing an outside source of heat.
30. A BLEVE:
A. most common occurs when flames contact the relief valve.
B. can occur when insufficient water is applied to keep the tank cool.
C. is a slow deterioration of the tank.
D. is a condition caused by consolidation of vaporization.
31. Reinforced concrete has excellent______ strength when it cures.
A. shear
B. compressive
C. torsional
D. tensile
32. Masonry load-bearing walls are most commonly found in _______ construction.
A. ordinary
B. frame
C. fire resistive
D. noncombustible
33. Which of the following gases is not produced in fires?
A. Carbon monoxide A2)Hydrogen cyanide
B. Carbon dioxide
C. Oxygen