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LLPSD FF1 Chapter 8 Exam with correct
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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 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 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 A class K agent's effect on the fuel is known as _______. a. dissolution b. emulsification c. hydrolyzation d. saponification - Answer -d. saponification 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 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 Bromochlorodifluoromenthane is a ______ agent. a. class D b. multipurpose dry chemical c. halogenated d. wet chemical - Answer -c. halogenated What is one disadvantage of CO2 extinguishers? a. corrosive residue b. cost c. electrical conductivity d. short discharge range - Answer -d. short discharge range All portable fire extinguishers use which means for expelling their contents? a. volume b. gravity c. pressure d. vacuum - Answer -c. pressure Which class of fire involves energized electrical equipment? a. C b. B c. D d. A - Answer -a. C 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 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 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
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 Which hazard category includes automotive service or repair facilities? a. moderate b. extra c. severe d. ordinary - Answer -b. extra 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 Which class of fire includes cloth? a. B b. C c. A d. D - Answer -c. A 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 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 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
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 A class A fire extinguisher with a numerical rating of 2 contains _____ gallons of water. a. 2. b. 1. c. 1. d. 2.5 - Answer -d. 2. What residue does a CO2 fire extinguisher leave when discharged? a. iron oxide b. none c. carbon d. mineral salt - Answer -b. none 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 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 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 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 Which extinguishing agent is suitable for use on a Class C fire?
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 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 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 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 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 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 Which class of fire involves combustible metals? a. A b. D c. B d. K - Answer -b. D
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 What is used to pressurize a stored-pressure water extinguisher? a. water b. nitrogen c. compressed air d. carbon dioxide - Answer -c. compressed air 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 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 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 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 In general, the maximum reach of a CO2 extinguisher is ____ feet. a. 16 b. 8 c. 4
Requirements for placing and mounting portable fire extinguishers are found in NFPA _____. a. 470 b. 1201 c. 10 d. 170 - Answer -c. 10 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 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 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 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 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 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
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 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 Which class of fire involves combustible cooking oils and fats? a. K b. A c. B d. D - Answer -a. K 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 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 Which class of fire includes flammable and combustible liquids? a. A b. C c. D d. B - Answer -d. B
