fire science chapter 7 portable fire extinguishers exam 2024 with 100% complete solutions

NFPA 1001 and 10 correct answersaccording to NFPA 1001, those qualified as FF1 level must know the following about portable fire extinguishers: -classifications of the types of fires -risks associated with each class of fire -operating methods of portable fire extinguishers -limitations of portable fire extinguishers NFPA 10, Standard for portable fire extinguishers class A fire correct answersinvolve ordinary combustibles such as textiles, paper, plastics, rubber, and wood. these fuels can easily be extinguished with water, water-based agents such as class A foam, or dry chemicals class B correct answersinvolves flammable and combustible liquids and gases , such as alcohol, gasoline, lubricating oils, and liquified petroleum gas (LPG). agents used to extinguish special hazard class B fires are CO2, dry chemical , and class B foam class C correct answersenergized electrical equipment. because water and water-based agents will conduct electrical current, they cannot be used on class C fires until the electrical energy has been eliminated. class C extinguishing agents will not conduct electricity making them suitable for electrical fires. class D correct answersinvolve combustible metals and alloys such as lithium, magnesium, potassium and sodium. these types of fires can be identified by the bright white emissions during their combustion process. *the use of water or water-based agents on class D fires will cause the fire to react violently, and emit bits of molten metal. class D dry powder extinguishers work best on these types of fires; however, do not confuse dry powder extinguishers with dry chemical units used on class A, B, and C fires