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26 Cards in this Set
- Front
- Back
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Water is obtained from one of two sources they are _______ and ________ water systems.
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Municipal and private water systems
page 34 (driver ops) |
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____ ____ allows water to flow,puddle, and remain together even ofter leaving a nozzle.
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surface tension
page 35 (driver ops) |
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As water passes through or moves by a substance, the positive and negative charges of the molecule take the various chemicals, minerals, and solvents along with it, thus earning water the title of _________ ________.
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Universal solvent
page 35 (driver ops) |
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Substances dissolved in water are referred to as _______
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aqueous
page 35 (driver ops) |
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The amount of heat energy required to increase the temperature of a substance is know as its ______ ____ _____.
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specific heat index
page 35 (driver ops) |
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Water in its liquid form weighs ___ pounds per gallon
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8.33
page 35 (driver ops) |
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True / False
Water is less dense as a solid than as a liquid |
True
page 36 (driver ops) |
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Water is the primary substance used to extinguis a fire for the following reasons: (3)
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1> Water turns to a vapor when it comes in contact with a fire.
2> Water absorbs heat and cools the smoke, air, and room and its contents, therby reducing the ignition tempature. 3> The water molecules in steam vapor carry the elements of smoke with them as the steam is ventilatd from the area. page 36 (driver ops) |
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The volume of water vapor is ___ greater than that of an equal amount of liquid water.
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1700 times greater
page 36 (driver ops) |
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_____ is the amount of dissolved calcium and magnesium, which increases the mineral content within water.
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Hardness
page 37 (driver ops) |
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What are the three parts to a municipal water system?
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Water source
treatment plant distribution system page 37 (driver ops) |
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Water pressure requirments differ, depending on how the water will be used. Generally, the water pressure ranges from ___ pounds per square inch to ___ psi at the delivery point.
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20 to 80 psi
page 37 (driver ops) |
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_____ _____ are large mains that carry large quantities of water to a section of the town or city.
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Primary feeders
page 38 (driver ops) |
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____ ____ distribute the water to a smaller area
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secondary feeders
page 38 (driver ops) |
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_______ carry water to the users and hydrants along individual streets.
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distributors
page 38 (driver ops) |
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The flow or quanitity of water moving through a pipe, hose, or nozzle is measured by it ____, usually given in terms of gallons per minute.
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volume
page 38 (driver ops) |
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___ ___ refers to an energy level and is meassured in psi.
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water pressure
page 38 (driver ops) |
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____ ____ is the pressure in a system when the water is not moving
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static pressure
page 39 (driver ops) |
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True False
Static pressure is generally created by elevation pressure and or pump pressure. |
True
page 39 (driver ops) |
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______ ______ _____ refers to the amount of pressure in the water distribution system during a period of normal consumption.
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normal operating pressure
page 39 (driver ops) |
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____ ____ is the amount of pressure that remains in the system when the water is flowing.
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Residual presure
page 39 (driver ops) |
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In theory, when the maximum amount of water is flowing, the residual pressure is zero, and there is no more potential energy to push more water through the system. In reality,___ psi is considered the minimum usable residual pressure.
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20 psi
page 39 (driver ops) |
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Atmospheric pressure drops as altitude increases, and this drop in pressure causes pumps to work harder to generate the same pressure at lower altitudes. Atmospheric pressure decreases approximately __ psi for every 1000 feet that the geographic location rises above sea level.
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0.5 psi
page 39 (driver ops) |
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Fire hydrants may be placed a certain distance apart, about every ___ feet in residential areas and every ___ feet in high value commercial and industrial areas.
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500 and 300 feet
page 42 (driver ops) |
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Which NFPA requires a minimum of 8" from the center of the hose outlet ot the finish grade on fire hydrants?
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NFPA 291, Recommended Practice for Fire Flow Testing and Marking of Hydrants
page 46 (driver ops) |
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____ ____ also provide quick and reliable access to static water sources. It is a pipe with a strainer on one end and a connection for a hard suction hose on the other end.
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Dry hydrant
page 49 (driver ops) |
