Fire Apparatus Driver Operator - Pumper Module 4 Practice Questions 2024.

Fire Apparatus Driver Operator - Pumper Module 4 Practice Questions 2024. One gallon of water weighs? - correct answer 8.33 lbs Water freeze and boil temperatures? - correct answer Freezes: 32° F Boils: 212° F Water expansion ratio at 500° F. - correct answer 1,700 to 1 Law of Specific Heat - correct answer Ability of any substance to absorb heat. Water is the standard for measuring specific heat and is given a value of 1.0 Specific heat is measured in British Thermal Unites (BTUs). Latent Heat of Vaporization - correct answer The amount of heat needed to turn a liquid into a vapor. It takes one BTU to raise one pound of water 1°, up to 212° F. Once water reaches 212° F, each pound requires an additional 970 BTUs to convert it to steam. Knowledge Check 1 1. Most extinguishing agents require less than one BTU to raise their temperature 1° F. 2. This is the heat absorbing capacity of a substance. 3. Water absorbs over 950 additional BTUs going from 212° F to steam. 4. This is the amount of heat needed to turn a liquid into a vapor. - correct answer Law of specific Heat 1 & 2 Law of Latent Heat of Vaporization 3 & 4 Heat Absorption - correct answer Speed at which water absorbs heat depends upon the amount of water surface exposed to the heat. Example Fog nozzle flowing at 100 gpm for a room 96x50x10 will fill a room with steam using the different patterns. - correct answer Straight Stream: 9 Minutes Narrow Fog: 6 Minutes Wide Fog: 1.5 Minutes Advantages of water as an extinguishing agent - correct answer Can absorb large amount of heat before turning to steam