ch 14 test quiz Flashcards
A Pitot gauge is used to calculate:
volume of flowing water
The pipes that deliver water from the treatment facility for distribution are:
mains
What is the minimum recommended pressure for water coming from a fire hydrant?
20 psi (138 kPa)
The pipes that deliver water to users and hydrants on individual streets are:
distributors.
Which pipe pattern supplies water to hydrants from more than one direction?
Grid
Where are dry-barrel hydrants typically located?
Cold climates
Which is the term for the large discharge opening on a fire hydrant?
Steamer
How can you determine that a dry-barrel hydrant is still draining?
Place a hand over an outlet and feel for suction
The NFPA recommends color-coding hydrants to indicate:
available flow.
Fire hydrants should be inspected at least once every _____ months.
12
An object in motion possesses which kind of energy as a result of that motion?
Kinetic
When water is motionless, which kind of energy does it have?
Potential
Pressure in a water distribution system during average consumption is __________ pressure.
normal operating
What is the realistic minimum usable residual pressure from a water distribution system for firefighting operations?
20 psi (138 kPa)
How close must a fire engine get to a static water source to be able to draft directly from it through hard suction hose?
20 ft (6 m)
A dry hydrant provides access to a:
static water source.
In general, mobile water supply apparatus (tankers) carry __________ of water.
1000 to 3500 gal (3785 to 13,249 L)
What is the maximum capacity of typical portable water tanks?
5000 gal (18,927 L)
How many gallons per minute can a tanker shuttle operation deliver without interruption?
Several hundred
Fire fighters may need to hold on to the ________ while filling a self-expanding portable tank.
collar
Portable pumps can deliver a maximum of:
500 gpm (1893 lpm).
Which is the fastest way for a mobile water supply apparatus to offload water into a portable tank?
Use the dump valve
Which pressure measurement provides the best indicator of how much more water is available in the system?
Residual
In a well-designed water distribution system, which type of pattern do the water mains follow?
Grid
Which is a common size of hydrant outlet?
2½” (65 mm)
Which is the term for the middle-size water main in a municipal water distribution system?
Secondary feeder
Which is the NFPA color code for a hydrant flowing less than 500 gpm (1893 lpm)?
Red
Which is the NFPA color code for a hydrant flowing 500 to 999 gpm (1893 to 3781 lpm)?
Orange
Which is the NFPA color code for a hydrant flowing 1000 to 1499 gpm (3785 to 5674 lpm)?
Green
Which is the NFPA color code for a hydrant flowing 1500 gpm (5678 lpm) or more?
Light blue
According to the NFPA, what is the minimum distance between the center of a fire hydrant outlet and the finished grade of the ground around the hydrant?
18” (45 cm)
The flow or quantity of water moving is usually measured in:
gallons per minute (liters per minute).
The pressure in a system when no water is flowing is called ________ pressure.
static
Another term for head pressure is __________ pressure.
elevation
Which pressure must be measured to calculate the quantity of water flowing through a hydrant discharge?
Residual
The pressure remaining in a water distribution system when water is flowing is the ________ pressure.
residual
What should be done to avoid water hammer?
Open and close all valves slowly
What is the decrease in pressure that occurs as water moves through a hose?
Friction loss
What is hard suction hose most commonly used for?
Drafting from a static water source
Where is the main valve located in a dry-barrel hydrant?
Below the frost line
Which is one of the four factors that determine friction loss?
Hose diameter
The quantity of water that is being moved through a pipe or hose is termed the:
flow
Which term means the properties of energy, pressure, and water flow as related to fire suppression?
Hydraulics
Which term means the amount of energy in water?
Pressure
On a wet-barrel hydrant, where is the valve located?
On each outlet
Friction loss is __________ proportional to the length of a hose.
directly
In areas of the western US where aircraft are used to fight wildland fires, which term is used for automotive water supply apparatus?
Tender
A jet siphon is used for which application?
Transferring water between portable tanks
Where is a dump valve located?
On a mobile water supply apparatus
Which type of pressure is created by the difference in height between a water source and the point of discharge?
Elevation
