Driver Operator Pumper Correctly Answered Test 2024.

Driver Operator Pumper Correctly Answered Test 2024. Water - correct answer - most commonly used extinguishing agent - noncombustible - absorbs large amounts of heat Waters Boiling Point - correct answer 212° F Waters freezing point - correct answer 32°F Waters Expansion Rate - correct answer 1,700 to 1 at 500° F Law of Specific Heat - correct answer Measures the ability of any substance to absorb heat Measured in BTUs (British Thermal Units) 1 BTU = the amount of heat required to raise 1lb of water 1°F Law of Latent Heat of Vaporization - correct answer The amount of heat needed to turn a liquid into a vapor 1 BTU to raise 1lb of water 1 degree up to 212° F Adjustable Fog Nozzle - correct answer Straight Stream Narrow Fog Wide Fog All 3 discharge at a rate of 100 gpm The wider the pattern, the shorter the time span to fill a room with steam. Advantages of Water - correct answer 1. Can absorb large amounts of heat 2. As surface area increases, heat absorption increases 3. Water is plentiful in most areas 4. Steam occupies 1,700 times its original volume as water Disadvantages of Water - correct answer 1. High surface tension limits its penetration into dense materials 2. Incompatible with or reactive to certain fuels and combustible materials 3. Ice makes roofs and ladders slippery and can make equipment malfunction 4. Conducts electricity and makes work with energized electrical equipment dangerous