P, D, &Ss ch.3

What is the primary way that water extinguishes fire?
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What is the primary way that water extinguishes fire?
cooling
If water is divided into many drops, the rate of heat absorption:
increases hundreds of times
Which of the following is an advantage of using water as an extinguishing agent?
availability, heat-absorbing capacity, surface area, cost.
A disadvantage of using water as an extinguishing agent is that it:
1. Conductivity - is a hazard around energized electrical equipment. 2. high surface tension. 3.Reactivity 4.low opacity and reflectivity 5.freezing point 6. Conductivity 8. contaminates runoff 9. weight 10. Availability of water (in some regions)
Pressure exerted on the earth by the atmosphere itself is:
atmospheric pressure.
Stored potential energy available to force water through pipes, fittings, fire hose, and adapters is:
Static Pressure
Pressure left or not used to overcome friction loss or gravity while forcing water through pipes is:
Residual pressure
As the length of hose or piping increases:
Friction loss increases.
Which of the following is NOT a characteristic that affects friction loss?
a. Pressure on the water
b. sharp bends or kinks in the hose.
c. Elbows and other fittings in pipings.
d. Hose and piping layouts such as length and diameter
Pressure on the water.
What is the fire department's main concern regarding the water processing or treatment facilities?
The pumping station could become disabled.
Elevated tanks are an example of:gravity system.Private water supply systems MOST commonly receive water from:a municipal water supply system.Why must care be taken to prevent a private water source from entering the municipal water system?Private water sources may not be potable.Fire hydrant supply mains should be at least: a. 2 inches in diameter. b. 4 inches in diameter. c. 6 inches in diameter. d. 10 inches in diameter.6 inches in diameter.An indicating valve that has a yoke on the outside of the valve with a threaded stem that opens or closes the gate inside the valve is a(n):outside stem and yoke valve.An indicating valve that is a hollow metal post that is attached to the valve housing is a(n):post indicator valve.Which of the following statements about dry-barrel hydrants is MOST accurate?There is no water inside the hydrant until it is turned on.Which of the following statements about wet-barrel hydrants is MOST accurate?There is water inside the hydrant at all times.How often should fire hydrants be flushed?every year.The spacing of fire hydrants is ultimately determined by the:Authority having jurisdiction. (AHJ)