IFSTA 7 Essentials Chapter 6 Test Questions & Answers

Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and: - ANSWERSduration and range of discharge used in extinguishing test fires. A portable fire extinguisher must be labeled with the: - ANSWERSletters and/or symbols that designate its class rating. Class K rated extinguishers work because of _____, which converts fatty acids into a soapy film. - ANSWERSsaponification When operating a portable fire extinguisher, it is safest to approach the fire: - ANSWERSwith the wind at your back. When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will: - ANSWERSinclude application instructions on the faceplate. What is a characteristic of carbon dioxide (CO2) extinguishers? - ANSWERSCO2 gas displaces oxygen to smother the fire What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness? - ANSWERSClass A foam Pump-type water extinguishers are intended primarily for use on: - ANSWERSground cover fires The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces: - ANSWERShigher quality foam than a standard extinguisher nozzle What is the first step in the PASS application method of operating a portable fire extinguisher? - ANSWERSPull the pin to break the thin wire or plastic seal. Portable fire extinguishers are classified according to the: - ANSWERStype of fire they are designed to extinguish. A _____ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out the nozzle. - ANSWERSmanual pump How does chemical flame inhibition work to extinguish fire? - ANSWERSInterrupts the chemical chain reaction in the burning process Which type of extinguishing agent is used to extinguish a Class B fire? - ANSWERSCarbon dioxide Which material is a Class B fuel? - ANSWERSGasoline Which extinguishing agent should be used for a Class D fire? - ANSWERSDry powder _____ is an example of a Class D fuel. - ANSWERSMagnesium Which statement about Class C fires is accurate? - ANSWERSOnce the electricity has been shut off to a Class C fire, it may be treated as a Class A or Class B fire. In which situation would a dry chemical extinguisher be MOST effective? - ANSWERSTitanium fire Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident? - ANSWERSAqueous film forming foam (AFFF) extinguisher Which statement about using a portable fire extinguisher on an incipient stage fire is accurate? - ANSWERSOperating close to the fire can scatter solid fuel or penetrate the surface of liquid fuel. What action should be taken if an entire extinguisher is discharged but the fire is not extinguished? - ANSWERSWithdraw and reassess the situation When operating a portable fire extinguisher,: - ANSWERSaim the nozzle at the base of the fire. When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider: - ANSWERSthe class of fuel that is burning. Class K fires involve: - ANSWERScooking oils. Where would a clean agent extinguisher likely be used? - ANSWERSComputer room fire How would a fire containing plastics be classified? - ANSWERSClass A On which type of fires are stored-pressure water mist extinguishers safe and effective to use? - ANSWERSClass C Which method of extinguishment excludes oxygen from the burning process? - ANSWERSSmothering Stored-pressure water extinguishers are used on Class _____ fires. - ANSWERSA Which statement about dry chemical extinguishers is accurate? - ANSWERSParticles of the agent may become airborne during application. Wet chemical stored-pressure extinguishers are intended for use on _____ fires. - ANSWERSClass K When applying a dry powder agent, it is important to: - ANSWERSavoid breaking the crust that forms over the burning material. A _____ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers. - ANSWERSClean agent What should be the next step after choosing the appropriate fire extinguisher for a fire? - ANSWERSInspect the extinguisher to make sure it is charged and operable.Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and: - ANSWERSduration and range of discharge used in extinguishing test fires. A portable fire extinguisher must be labeled with the: - ANSWERSletters and/or symbols that designate its class rating. Class K rated extinguishers work because of _____, which converts fatty acids into a soapy film. - ANSWERSsaponification When operating a portable fire extinguisher, it is safest to approach the fire: - ANSWERSwith the wind at your back. When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will: - ANSWERSinclude application instructions on the faceplate. What is a characteristic of carbon dioxide (CO2) extinguishers? - ANSWERSCO2 gas displaces oxygen to smother the fire What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness? - ANSWERSClass A foam Pump-type water extinguishers are intended primarily for use on: - ANSWERSground cover fires The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces: - ANSWERShigher quality foam than a standard extinguisher nozzle