Download IFSTA 42 Quiz Questions and Answers: Chapter 18 - Fire Fighting Foam and more Exams Safety and Fire Engineering in PDF only on Docsity!
Ch 18 IFSTA 42 Quiz Questions And
Answers
Which type of foam proportioner can compromise firefighter safety by slowing firefighters down since it requires the concentrate to be available where the nozzle is being operated? Select one: a. Compressed air foam system (CAFS) b. Apparatus-mounted proportioner c. Foam nozzle eductor d. In-line eductor - โ โ Foam nozzle educator Class B foams are especially effective on: Select one: a. hydrocarbon fuels. b. surfactants. c. energized electrical equipment. d. ordinary combustibles. - โ โ hydrocarbon fuels. Mixing water with foam concentrate to form a foam solution is referred to as: Select one: a. aerating.
b. proportioning. c. surfacting. d. saponifying. - โ โ proportioning. High-quality foam bubbles are created through the process of: Select one: a. separation. b. expansion. c. saponification. d. aeration. - โ โ aeration. If a large pool of flammable liquid is burning in an open area, the _____ method of foam application may be the most effective method to use. Select one: a. roll-on b. spread-across c. bank-down d. rain-down - โ โ rain down Which is a responsibility of the fire department at a response involving a suspected propane leak? Select one: a. Isolate the pressure vessel systems
b. Lower quality foam than fog nozzles c. Shorter stream reach than fog nozzles d. Longer stream reach than fog nozzles - โ โ Shorter stream reach than fog nozzles Which is an appropriate safe action to take at an incident involving a BLEVE? Select one: a. Approach the vessel at the ends of the tank b. Apply fire fighting foam at a close range c. Fight fire from the maximum distance possible d. Attempt to open the vessel's pressure relief valve - โ โ Fight fire from the maximum distance possible What is a disadvantage of using fog nozzles to apply fire fighting foam? Select one: a. They are specialty nozzles that are not widely available on most apparatus. b. Operator error is more likely to produce lower quality foam. c. They are not as versatile as foam nozzles. d. They provide a limited reach compared to other nozzles. - โ โ Operator error is more likely to produce lower quality foam. Which method of foam proportioning involves using an external pump to force foam concentrate into the fire stream?
Select one: a. Premixing b. Batch mixing c. Eduction d. Injection - โ โ Injection An advantage of _____ is that they are widely available on most fire apparatus. Select one: a. apparatus-mounted proportioners b. foam nozzles c. compressed air foam systems (CAFS) d. fog nozzles - โ โ fog nozzles What happens when a BLEVE occurs? Select one: a. Fire involving combustible gases b. Violent rupture of a pressurized container c. Contaminated water supply d. Failure of a post indicator valve - โ โ Violent rupture of a pressurized container The rate of application for Class B foam depends on:
d. raises the surface tension of water, creating a more effective extinguishing agent. - โ โ lowers the surface tension of water, allowing better penetration into the fuel. The premixing method of foam proportioning is typically used with: Select one: a. fog nozzles attached to a large hoseline. b. a fixed fire protection system in a structure. c. in-line eductors. d. vehicle-mounted tank systems. - โ โ vehicle-mounted tank systems. Which method of foam application is only suitable for use on a pool of liquid fuel on open ground? Select one: a. Roll-on method b. Spread-over method c. Bank-down method d. Rain-down method - โ โ Roll-on method In order to prevent reignition of a liquid fuel fire after foam has been applied, do NOT: Select one: a. let the foam sit for more than 5-10 minutes without replenishing it.
b. apply a solid or straight stream of water to the foam blanket. c. add any more foam after the surface has been covered once. d. apply more foam than necessary for extinguishment. - โ โ apply a solid or straight stream of water to the foam blanket. Most fire fighting foams are intended to be mixed with: Select one: a. 50 to 75.9 percent water. b. 80 to 90 percent water. c. 30 to 60 percent water. d. 94 to 99.9 percent water. - โ โ 94 to 99.9 percent water. What is an advantage of using a foam nozzle to apply fire fighting foam? Select one: a. Produces higher quality foam than a fog nozzle b. More widely available than a fog nozzle c. Longer reach than other nozzles d. More versatile than a fog nozzle - โ โ Produces higher quality foam than a fog nozzle Because of environmental concerns about fire fighting foam, firefighters should: Select one:
Which method of foam application would be well suited for a flammable liquid spill near the exterior wall of a building? Select one: a. Roll-on method b. Rain-down method c. Spread-over method d. Bank-down method - โ โ Bank-down method Which action should be avoided during an incident involving a tanker carrying flammable fuels? Select one: a. Using road flares b. Using fire fighting foam c. Applying water for victim protection d. Allowing a lane of traffic to remain open - โ โ Using road flares If the foam being produced is poor quality, the firefighter should: Select one: a. use a longer hose lay to provide less friction loss. b. move the nozzle farther above the eductor to reduce elevation pressure. c. check to make sure there are no air leaks in the proportioning device.
d. close the nozzle slightly to reduce the amount of water flow. - โ โ check to make sure there are no air leaks in the proportioning device. A(An) _____ is mounted on an apparatus and uses a centrifugal pump to supply the water for the foam solution and an onboard air compressor to add air to the mixture before discharge. Select one: a. compressed air foam system (CAFS) b. in-line eductor c. balanced-pressure proportioner d. around-the-pump proportioner - โ โ compressed air foam system (CAFS) The amount that fire fighting foam expands depends on the type of foam concentrate used and: Select one: a. whether potable or nonpotable water is used in the solution. b. the number of personnel working with the proportioner. c. accurate proportioning of the foam concentrate in the solution. d. whether the water is from a static or pressurized source. - โ โ accurate proportioning of the foam concentrate in the solution. At an incident involving a gas distribution system, if the gas is burning: Select one: a. the flame should not be extinguished.
What action should be taken if a pressurized vessel containing flammable gas is exposed to flames? Select one: a. Apply a solid stream of water b. Apply a fog stream of water c. Apply foam using the roll-on method d. Apply foam using the bank-down method - โ โ Apply a solid stream of water Which statement accurately describes pressurized vessels? Select one: a. They are color-coded so responders can easily identify the contents. b. They will look the same as vessels used to transport or contain flammable solids. c. They must have relief hatches or manholes for easy access to the contents. d. They should be marked with placards or stickers identifying the contents. - โ โ They should be marked with placards or stickers identifying the contents. Which is true of polar solvent fuels? Select one: a. Gasoline is the most common example of a polar solvent. b. They are flammable liquids that mix readily with water.
c. Fires involving polar solvents can be extinguished using Class B foams designed for hydrocarbon fires. d. Fires involving polar solvents can be extinguished using Class A foams designed for ordinary combustible fires. - โ โ They are flammable liquids that mix readily with water. Which type of substances have a flash point less than 100ยฐF (38ยฐC)? Select one: a. Flammable liquids b. Surfactants c. Combustible liquids d. Combustible gases - โ โ Flammable liquids Any valve operation must be performed in coordination with: Select one: a. salvage and overhaul. b. a hazardous materials team leader. c. facility personnel supervision. d. ventilation efforts. - โ โ facility personnel supervision. At a bulk transport incident, firefighters must: Select one: a. shut down all lanes of traffic around the incident. b. identify the material involved.
b. Weather conditions c. Available water pressure d. Stage of fire development - โ โ Available water pressure
