LLPSD FF1 Chapter 8 Questions and Answers 100% Verified

LLPSD FF1 Chapter 8 Questions and Answers 100% Verified 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 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 a. harmful to the environment Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:15 Full screen Brainpower Read More 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 b. metal horn A class K agent's effect on the fuel is known as _______. a. dissolution b. emulsification c. hydrolyzation d. saponification 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 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 c. after any discharge Bromochlorodifluoromenthane is a ______ agent. a. class D b. multipurpose dry chemical c. halogenated d. wet chemical c. halogenated What is one disadvantage of CO2 extinguishers? a. corrosive residue b. cost c. electrical conductivity d. short discharge range d. short discharge range All portable fire extinguishers use which means for expelling their contents? a. volume b. gravity c. pressure d. vacuum c. pressure Which class of fire involves energized electrical equipment? a. C b. B c. D d. A 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 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 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 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 d. use on that class of fire could be hazardous What is the term for the substance that puts out the fire? a. propellant b. extinguishing agent c. live load d. dry charge b. extinguishing agent 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 d. wet chemical A loaded stream extinguisher is designed to ______. a. improve fuel penetration b. resist freezing c. prevent unnecessary water damage d. create a foam blanket b. resist freezing 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 d. fire in a wastebasket 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 c. kitchen A class B foam extinguisher is NOT rated for which fuel? a. cooking oil b. paint thinner c. diesel fuel d. gasoline a. cooking oil 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 a. the classes of fire on which they are effective 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 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 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 d. they are not necessarily related Which class of fire includes cloth? a. B b. C c. A d. D c. A Combustion begins when a fuel is heated to its _____. a. lower flammable limit b. fire point c. flash point d. ignition point 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 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 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 d. amount of combustibles present 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 d. 2.5 What residue does a CO2 fire extinguisher leave when discharged? a. iron oxide b. none c. carbon d. mineral salt 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 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 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 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 a. C 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 d. carbon dioxide 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 b. interrupting the chemical chain reaction 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 d. carbon dioxide 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 c. classroom 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 d. be electrically non-conductive 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 c. occupancy type 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 b. oxygen 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 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 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 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 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 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 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 b. D