A Loaded Stream Extinguisher Is Designed To

Question: For an extinguishing agent to be rated for a particular class of fire, it must ______.
a. be effective in portable volumes
b. prevent rekindling
c. be nontoxic
d. be noncorrosive
Answer: b. prevent rekindling
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Question: The use of Halon 1211 is strictly controlled because it is _____.
a. harmful to the environment
b. carcinogenic
c. mutagenic
d. a chemical asphyxiant
Answer: a. harmful to the environment
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Question: Which feature of some carbon dioxide extinguishers makes them dangerous for use on Class C fires?
a. steel cylinder
b. metal horn
c. loaded stream
d. external cartridge
Answer: b. metal horn
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Question: A class K agent's effect on the fuel is known as _______.
a. dissolution
b. emulsification
c. hydrolyzation
d. saponification
Answer: d. saponification
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Question: Which of the following is commonly used as a dry chemical extinguishing agent?
a. carbon tetrachloride
b. potassium hydrate
c. ammonium phosphate
d. calcium bicarbonate
Answer: c. ammonium phosphate
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Question: Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?
a. after a discharge resulting in loss of 30 percent or pressurization
b. after a discharge resulting in loss of 10 percent of pressurization
c. after any discharge
d. after a discharge resulting in loss of 20 percent of pressurization
Answer: c. after any discharge
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Question: Bromochlorodifluoromenthane is a ______ agent.
a. class D
b. multipurpose dry chemical
c. halogenated
d. wet chemical
Answer: c. halogenated
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Question: What is one disadvantage of CO2 extinguishers?
a. corrosive residue
b. cost
c. electrical conductivity
d. short discharge range
Answer: d. short discharge range
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Question: All portable fire extinguishers use which means for expelling their contents?
a. volume
b. gravity
c. pressure
d. vacuum
Answer: c. pressure
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Question: Which class of fire involves energized electrical equipment?
a. C
b. B
c. D
d. A
Answer: a. C
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Question: How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
a. by attracting and holding moisture
b. by forming a crust over the fuel
c. by penetrating the fuel
d. by interrupting the chemical chain reaction
Answer: b. by forming a crust over the fuel
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Question: Which compound is added to a water extinguisher to improve penetration of fuel?
a. alcohol
b. alkai metal salt
c. a wetting agent
d. bicarbonate
Answer: c. a wetting agent
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Question: What does it mean when a fire extinguisher has a pictograph with a red slash through it?
a. use on that class of fire would be ineffective
b. the fire extinguisher is rated for use on that class of fire
c. the fire extinguisher has not been tested for use on that class of fire
d. use on that class of fire could be hazardous
Answer: d. use on that class of fire could be hazardous
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Question: What is the term for the substance that puts out the fire?
a. propellant
b. extinguishing agent
c. live load
d. dry charge
Answer: b. extinguishing agent
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Question: Which agent is approved for use in a Class K system?
a. carbon dioxide
b. aqueous film-forming foam
c. dry chemical
d. wet chemical
Answer: d. wet chemical
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Question: A loaded stream extinguisher is designed to ______.
a. improve fuel penetration
b. resist freezing
c. prevent unnecessary water damage
d. create a foam blanket
Answer: b. resist freezing
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Question: A portable fire extinguisher is best suited for which situation?
a. room and contents fire
b. vegetation fire
c. car fire
d. fire in a wastebasket
Answer: d. fire in a wastebasket
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Question: If a private residence has a single fire extinguisher, where should it be located?
a. near the bedrooms
b. laundry area
c. kitchen
d. garage
Answer: c. kitchen
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Question: A class B foam extinguisher is NOT rated for which fuel?
a. cooking oil
b. paint thinner
c. diesel fuel
d. gasoline
Answer: a. cooking oil
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Question: All fire extinguishers are classified according to ______.
a. the classes of fire on which they are effective
b. their relative extinguishing power
c. the net weight of their contents
d. the type of extinguishing agent used
Answer: a. the classes of fire on which they are effective
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Question: What is a correct use for a portable fire extinguisher?
a. diluting flammable liquids
b. pretreating exposures
c. overhaul
d. situations in which the use of water is not recommended
Answer: d. situations in which the use of water is not recommended
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Question: Which hazard category includes automotive service or repair facilities?
a. moderate
b. extra
c. severe
d. ordinary
Answer: b. extra
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Question: For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?
a. hazard determines occupancy
b. occupancy determines hazard
c. they are different terms for the same thing
d. they are not necessarily related
Answer: d. they are not necessarily related
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Question: Which class of fire includes cloth?
a. B
b. C
c. A
d. D
Answer: c. A
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Question: Combustion begins when a fuel is heated to its _____.
a. lower flammable limit
b. fire point
c. flash point
d. ignition point
Answer: d. ignition point
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Question: What expels the extinguisher agent from a pump tank water extinguisher?
a. gravity
b. pressure cartridge
c. compressed air
d. manual effort
Answer: d. manual effort
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Question: Dry chemical extinguishers may be used on Class C fires because they _______.
a. are noncorrosive
b. do not conduct electricity
c. leave no residue
d. are chemically similar to water
Answer: b. do not conduct electricity
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Question: What is a primary factor when determining hazard classifications for extinguisher selection and placement?
a. permissible occupancy load
b. do not conduct electricity
c. presence of sprinkler system
d. amount of combustibles present
Answer: d. amount of combustibles present
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Question: A class A fire extinguisher with a numerical rating of 2 contains _____ gallons of water.
a. 2.2
b. 1.5
c. 1.0
d. 2.5
Answer: d. 2.5
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Question: What residue does a CO2 fire extinguisher leave when discharged?
a. iron oxide
b. none
c. carbon
d. mineral salt
Answer: b. none
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Question: Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
a. diluting the fuel
b. inhibiting the chemical chain reaction
c. cooling the fuel
d. cutting off the oxygen supply
Answer: d. cutting off the oxygen supply
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Question: Which class of fire is depicted in the pictograph system by a flame and gasoline can.
a. C
b. A
c. B
d. D
Answer: c. B
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Question: Which class of fire is depicted in the pictograph system by a fire in a frying pan?
a. C
b. B
c. K
d. D
Answer: c. K
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Question: Which class of fire is depicted in the pictograph system by a flame and electrical plug and socket?
a. C
b. D
c. K
d. B
Answer: a. C
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Question: Which extinguishing agent is suitable for use on a Class C fire?
a. aqueous film-forming foam (AFF)
b. carbon tetrachloride
c. dry powder
d. carbon dioxide
Answer: d. carbon dioxide
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Question: What is the primary extinguishing mechanism of dry chemical agents?
a. forming a crust over the fuel
b. interrupting the chemical chain reaction
c. displacing oxygen
d. suppressing vapor production
Answer: b. interrupting the chemical chain reaction
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Question: Which fire extinguishing agent is best for use on sensitive electronic equipment?
a. aqueous film-forming foam (AFFF)
b. loaded stream
c. ammonium phosphate
d. carbon dioxide
Answer: d. carbon dioxide
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Question: For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?
a. restaurant kitchen
b. parking garage
c. classroom
d. self-storage building
Answer: c. classroom
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Question: For an extinguishing agent to be approved for use on energized electrical equipment, it must ______.
a. form a vapor barrier
b. leave no residue
c. be safe of ruse in a closed room
d. be electrically non-conductive
Answer: d. be electrically non-conductive
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Question: According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on the _____.
a. occupancy load
b. construction class
c. occupancy type
d. presence of a built-in suppression system
Answer: c. occupancy type
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Question: Which of the following is one of the three basic components required for fire?
a. carbon
b. oxygen
c. an ignition source
d. a catalyst
Answer: b. oxygen
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Question: Which statement about foam fire extinguishers is correct?
a. both class A and class B extinguishers may be used to some effect on either class of fire
b. neither class A nor class B extinguishers can be used to any effect on the other class of fire
c. class A foam extinguishers may be used to some effect on Class B fires
d. class B foam extinguishers may be used to some effect on class A fires
Answer: d. class B foam extinguishers may be used to some effect on class A fires
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Question: What is the best way to extinguish a class C fire?
a. withdraw to a safe distance and let the fire burn itself out
b. shut off the power and treat it as a class A or B fire
c. use a class C extinguisher
d. shut off the fuel flow at a valve
Answer: b. shut off the power and treat it as a class A or B fire
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Question: A class C agent must _______.
a. be safe for use in an enclosed area
b. be compatible with foam
c. resist freezing
d. not conduct electricity
Answer: d. not conduct electricity
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Question: What is the most commonly used extinguishing agent for Class A fires?
a. water
b. ammonium phosphate
c. dry chemical
d. potassium bircarbonate
Answer: a. water
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Question: The weight of carbon dioxide is about _____ the weight of air.
a. twice
b. half of
c. equal to
d. one-and -a-half times
Answer: d. one-and -a-half times
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Question: For an area to qualify for the classification of "light hazard", most of the combustibles present must be _______.
a. arranged so that a fire is unlikely to spread
b. extinguishable by a portable fire extinguisher
c. Class A only
d. no more than moderately combustible
Answer: a. arranged s that a fire is unlikely to spread
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Question: Which class of fire involves combustible metals?
a. A
b. D
c. B
d. K
Answer: b. D
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Question: Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?
a. push, then pull
b. side to side motion
c. twisting motion
d. a strong pull directly outward
Answer: c. twisting motion
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Question: What is used to pressurize a stored-pressure water extinguisher?
a. water
b. nitrogen
c. compressed air
d. carbon dioxide
Answer: c. compressed air
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Question: The "P" in the acronym PASS, used in reference to fire extinguisher operation, stands for _______.
a. point
b. pause
c. pull
d. pick
Answer: c. pull
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Question: To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must ________.
a. be fire resistive
b. be class A or C combustibles
c. have a flash point exceeding 150 degrees F
d. be noncombustible
Answer: d. be noncombustible
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Question: The hydrostatic test interval for a dry chemical extinguisher with a stainless steel shell is every _____ years.
a. 12
b. 10
c. 3
d. 5
Answer: d. 5
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Question: Which statement about the numerical rating of a class K extinguisher is correct?
a. the numerical rating indicates the relative extinguishing power of the agent
b. a numerical rating is required for commercial hood systems
c. there is no numerical rating for a class K extinguisher
d. the numerical rating indicates the relative duration of the agent
Answer: c. there is no numerical rating for a class K extinguisher
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Question: In general, the maximum reach of a CO2 extinguisher is ____ feet.
a. 16
b. 8
c. 4
d. 32
Answer: b. 8
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Question: What is the term for a water-soluble flammable liquid?
a. miscible liquid
b. hypergolic fuel
c. solute
d. polar solvent
Answer: d. polar solvent
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Question: A class C extinguisher is rated for use on ______.
a. radioactive materials involved in flame
b. flammable chemical
c. energized electrical equipment
d. wood, paper, or cloth
Answer: c. energized electrical equipment
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Question: What does a rating of 40 on a class B extinguisher mean?
a. sufficient extinguisher power for 40 square feet of burning fuel
b. BTU absorption comparable to 40 gallons of water
c. discharge duration of at least 40 seconds
d. sufficient extinguishing power for 40 gallons of burning fuel
Answer: a. sufficient extinguisher power for 40 square feet of burning fuel
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Question: The traditional symbol for a class D fire extinguisher is a(n) _______.
a. orange circle
b. green triangle
c. blue square
d. yellow star
Answer: d. yellow star
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Question: Which class of fire extinguisher includes a number in its classification?
a. C
b. D
c. A
d. K
Answer: c. A
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Question: A fire extinguisher's agent is stored within its _____.
a. cylinder
b. tank
c. chamber
d. horn
Answer: a. cylinder
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Question: Which statement about dry chemical agents is correct?
a. dry chemical agents are not subject to freezing
b. dry chemical agents are noncorrosive
c. all dry chemical agents have a multipurpose rating
d. dry chemical agents are compatible with all types of foam
Answer: a. dry chemical agents are not subject to freezing
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Question: Requirements for placing and mounting portable fire extinguishers are found in NFPA _____.
a. 470
b. 1201
c. 10
d. 170
Answer: c. 10
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Question: Which statement is correct regarding class D extinguishing agents?
a. application methods are similar regardless of the agent and fuel involved
b. some agents are also rated for other classes of fire
c. the specific agent must be matched to the specific fuel
d. most agents are effective on several class D fuels
Answer: c. the specific agent must be matched to the specific fuel
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Question: What is an advantage of portable fire extinguishers over hose lines?
a. longer duration
b. faster deployment
c. controllable rates of flow
d. greater heat absorption
Answer: b. faster deployment
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Question: Class D agents work primarily by ______.
a. suppressing vapor production
b. inhibiting the chemical chain reaction
c. penetrating the fuel
d. forming a crust over the fuel
Answer: d. forming a crust over the fuel
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Question: What is the difference between dry powder and dry chemical extinguishing agents?
a. "dry powder" and "dry chemical" are both terms for the same class of agents
b. a dry powder is compatible with foam; a dry chemical is not
c. each is rated for a different class of fire
d. a dry powder is harmful to the environment; a dry chemical is not
Answer: c. each is rated for a different class of fire
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Question: A potential problem with application of a multipurpose dry chemical agent to a class K fire is ______.
a. spitting and splattering of fuel
b. neutralization of other agents applied to the fire
c. production of toxic gas
d. sudden flare-up of the fire
Answer: b. neutralization of other agents applied to the fire
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Question: Which agent is rated for use on class A fires?
a. potassium chloride
b. ammonium phosphate
c. sodium bircarbonate
d. potassium bircarbonate
Answer: b. ammonium phosphate
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Question: Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
a. A
b. C
c. B
d. K
Answer: c. A
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Question: For the purpose of extinguisher selection and placement, light hazard environments usually contain a limited amount of combustibles of which class?
a. D
b. C
c. B
d. K
Answer: c. B
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Question: Which class of fire involves combustible cooking oils and fats?
a. K
b. A
c. B
d. D
Answer: a. K
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Question: When approaching a fire with an extinguisher in hand, you should always have a(n) ________.
a. exit route
b. light source
c. portable radio
d. backup unit
Answer: a. exit route
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Question: For the purpose of extinguisher selection and placement, a woodworking shop is a(n) _______ hazard environment.
a. light
b. ordinary
c. extra
d. moderate
Answer: c. extra
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Question: Which class of fire includes flammable and combustible liquids?
a. A
b. C
c. D
d. B
Answer: d. B
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