Time, choice Fire times

Choice a is incorrect because the trend is for an increasing number of fires at this time. Choice h is incorrect because the graph does... 

U.S. Fire Administration NFIRS Response data submitted by local fire departments 1980-Present Includes fire and explosion incidents with no/little release, incidents resulting in property damage only, and near-misses if fire department was called Limited state participation Represents limited information available to fire department at time of response Checklist approach limits respondent choices Not designed to be a lessons-learned database... 

Waldo Semon was responsible for bringing many of the PVC products to market. As a young scientist at BF Goodrich, he worked on ways to synthesize rubber and to bind the rubber to metal. In his spare time, he discovered that PVC, when mixed with certain liquids, gave an elastic-like, pliable material that was rainproof, fire resistant, and did not conduct electricity. Under the trade name Koroseal, the rubbery material came into the marketplace, beginning around 1926, as shower curtains, raincoats, and umbrellas. During World War II, PVC became the material of choice to protest electrical wires for the Air Force and Navy. Another of his inventions was the SR patented under the name Ameripol that was dubbed liberty rubber since it replaced NR in the production of tires, gas masks, and other military equipment. Ameripol was a butadiene-type material. 

You can eliminate choices a and d pretty quickly, because they do not use good judgment or common sense. Choice c looks a little better, but common sense should tell you that the moment the truck is leaving for a fire is not a good time to run an equipment check anyway, the lights and siren shouldn t have to be checked every time the truck leaves or enters. 

Higher irradiation levels give better reproducibility, more clearly defined ignition, and shorter measurement times, but correspond to more developed fires. Thus particularly for flame-retarded polymers, a smaller irradiation level often corresponds better to the fire protection goals addressed. Cone calorimeter results for the HRR at small irradiances correspond to flammability tests such as LOI and UL 94, if a reasonable set of materials are compared and the behavior is not dominated by dripping effects. Thus different considerations govern the choice of external heat flux.76 77... 

Some engineers attempt to counter this problem with increased recirculation. They could spin the combustion products to reduce temperature differentials along the length of the pit, but the top-to-bottom temperature differentials would remain approximately three times as great as those with ambient air firing (120°F or 67°C). Even this possibility is unlikely because the volume of poc is so small and because convection heat transfer is proportional to velocity to the 0.7 power. The result is that oxygen combustion in soaking pits is not a wise choice when the quality of rolled material is temperature-uniformity-sensitive. 

In the European Union, the current code that relates to fire safety in the design and construction of buildings is Eurocode 1 - actions on stractures part 1.2 actions on structures exposed to fire [23]. This code was first released in 1990. Two forms of design fires are considered within the code normative and parametric. The normative design fire is used in the prescriptive portion of the code and refers to the time-temperature curves provided by the ISO 834 standard. The parametric portion of the code provides a performance-based design approach. Rather than using standard time-temperature curves, reahstic fire scenarios can be considered using a choice of simple or advanced fire models [7j. 

In mediaeval times, wort was boiled in iron cauldrons over open fires but as the scale of production increased, the vessels were covered over and fitted with a chimney or stack to carry steam out of the building. To construct these more complex vessels, copper, rather than cast iron, became the material of choice because of its malleability, superior conductivity and better resistance to corrosion. Accordingly, vessels in which wort boiling is carried out are often called coppers , even if the metal of construction is not copper. Other terms used are kettles or wort boilers. ... 

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