All residential sprinklers are required to have a thermal element or bulb, which is listed as: quick response. When water is mixed with a foam liquid concentrate to form a foam solution, this is known as what stage of foam production? Proportioning Water-mist systems may increase the time necessary for the egress of occupants because their activation: can reduce visibility. For foam application, the use of smooth bore nozzles is limited to: Class A, compressed-air foam system (CAFS) applications. Which nozzle requires the foam concentrate to be available where the nozzle is operated? Self-educating foam nozzle A valve provided to open and discharge water to drain if the pressure becomes excessive is a: relief valve. In which type of foam system is the foam discharge piping in place but not attached to a permanent source of foam? Semifixed Type A Wet sprinkler systems may be used in areas subject to freezing if the water is replaced with a(an): antifreeze solution. Every automatic sprinkler system must have a water supply of adequate volume, pressure, and: reliability. ![]() When inspecting sprinklers, a clearance of at least how many inches should be maintained between sprinklers and stored materials? 18 inches Which foam makers are most commonly used in subsurface injection systems that protect cone-roof hydrocarbon storage tanks? High back-pressure foam aspirator Which valve may be used as a control valve as long as it cannot be closed in less than five seconds? Ball In order to prevent the supply for a residential sprinkler system from being turned off, the sprinkler supply is: connected to the household water supply. The most common type of water-mist system works similarly to a traditional: deluge system. Automatic sprinkler systems help control a fire in its earlier stages, which allows firefighting operations to be conducted in a more: tenable atmosphere. Which type of foam fire-extinguishing system is a complete installation in which foam is piped from a central foam station and automatically discharges? Fixed foam With regard to wet-pipe sprinklers, NFPA® research indicates that what percent of fires are controlled with fewer than 10 sprinklers activated? 99 percent Frequent operation of a tank-mounted compressor on a dry sprinkler system is often caused by: system air loss. Modern sprinklers produce a water spray pattern that is directed downward, resulting in: reduced ceiling temperatures and better protection for structural elements. ![]() ![]() Which components are designed to protect sprinkler pipe against lateral and horizontal movement? Seismic restraints A benefit of water-mist fire suppression system compared to traditional sprinkler systems is the: limited amount of water used.
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