Studied by 49 PeopleTags & Description
Pressure in a water distribution system during average consumption is __________ pressure. A) residual B) mean C) normal operating D) static
C) normal operating
The NFPA recommends color-coding hydrants to indicate: A) the most recent flow test. B) available pressure. C) the water source. D) available flow.
D) available flow.
Fire fighters may need to hold on to the ________ while filling a self-expanding portable tank. A) frame B) hose C) rope D) collar
D) collar
The flow or quantity of water moving is usually measured in: A) joules. B) cubic feet per minute (cubic meters per minute). C) gallons per minute (liters per minute). D) pounds per square inch (kilopascals).
C) gallons per minute (liters per minute).
The pressure remaining in a water distribution system when water is flowing is the ________ pressure. A) static B) operating C) flow D) residual
D) residual
A dry hydrant provides access to a: A) municipal water system. B) static water source. C) portable water tank. D) cistern or well.
B) static water source.
When water is motionless, which kind of energy does it have? A) Residual B) Absolute C) Potential D) Kinetic
C) Potential
What is the decrease in pressure that occurs as water moves through a hose? A) Dynamic loss B) Residual pressure C) Water hammer D) Friction loss
D) Friction loss
What should be done to avoid water hammer? A) Always maintain a minimum residual pressure of 20 psi B) Never connect a hard suction hose to a pressurized water supply C) Purge air from the line before opening a valve or nozzle D) Open and close all valves slowly
D) Open and close all valves slowly
Which term means the properties of energy, pressure, and water flow as related to fire suppression? A) Hydrodynamics B) Friction loss C) Hydraulics D) Fire flow
C) Hydraulics
In areas of the western US where aircraft are used to fight wildland fires, which term is used for automotive water supply apparatus? A) Water truck B) Tanker C) Tender D) Tank truck
C) Tender
The pressure in a system when no water is flowing is called ________ pressure. A) static B) operating C) flow D) residual
A) static
Which is the term for the middle-size water main in a municipal water distribution system? A) Intermediate main B) Secondary feeder C) Distributor D) Trunk line
B) Secondary feeder
Which is the NFPA color code for a hydrant flowing less than 500 gpm (1893 lpm)? A) Red B) Orange C) Yellow D) White
A) Red
Portable pumps can deliver a maximum of: A) 250 gpm (946 lpm). B) 500 gpm (1893 lpm). C) 750 gpm (2839 lpm). D) 1000 gpm (3785 lpm).
B) 500 gpm (1893 lpm).
Which is a common size of hydrant outlet? A) 2½" (65 mm) B) 3" (75 mm) C) 3½" (90 mm) D) 4" (100 mm)
A) 2½" (65 mm)
What is the maximum capacity of typical portable water tanks? A) 1500 gal (5678 L) B) 2000 gal (7570 L) C) 3500 gal (13,249 L) D) 5000 gal (18,927 L)
D) 5000 gal (18,927 L)
What is the realistic minimum usable residual pressure from a water distribution system for firefighting operations? A) 0 psi (0 kPa) B) 20 psi (138 kPa) C) 30 psi (207 kPa) D) 40 psi (276 kPa)
B) 20 psi (138 kPa)
The pipes that deliver water to users and hydrants on individual streets are: A) service lines. B) secondaries. C) distributors. D) cross mains.
C) distributors.
Which type of pressure is created by the difference in height between a water source and the point of discharge? A) Elevation B) Static C) Flow D) Gravity
A) Elevation
In a well-designed water distribution system, which type of pattern do the water mains follow? A) Branched B) Parallel C) Loop D) Grid
D) Grid
How many gallons per minute can a tanker shuttle operation deliver without interruption? A) Zero B) A few hundred C) Several hundred D) A few thousand
C) Several hundred
What is the minimum recommended pressure for water coming from a fire hydrant? A) 20 psi (138 kPa) B) 30 psi (207 kPa) C) 40 psi (276 kPa) D) 50 psi (345 kPa)
A) 20 psi (138 kPa)
A Pitot gauge is used to calculate: A) pump discharge pressure. B) net pump pressure. C) static pressure. D) volume of flowing water.
D) volume of flowing water.
Which is the NFPA color code for a hydrant flowing 1500 gpm (5678 lpm) or more? A) White B) Orange C) Green D) Light blue
D) Light blue
How can you determine that a dry-barrel hydrant is still draining? A) Place a hand on the stem nut and feel for vibration B) Look for a continuing trickle from the discharge outlet C) Place a hand over an outlet and feel for suction D) Listen carefully for a hissing sound
C) Place a hand over an outlet and feel for suction
An object in motion possesses which kind of energy as a result of that motion? A) Entropic B) Kinetic C) Potential D) Inertial
B) Kinetic
Which pressure must be measured to calculate the quantity of water flowing through a hydrant discharge? A) Head B) Operating C) Flow D) Residual
D) Residual
Which pressure measurement provides the best indicator of how much more water is available in the system? A) Residual B) Static C) Normal operating D) Flow
A) Residual
Which pipe pattern supplies water to hydrants from more than one direction? A) Grid B) Engineered C) Duplex D) Parallel
A) Grid
Which is the NFPA color code for a hydrant flowing 500 to 999 gpm (1893 to 3781 lpm)? A) Red B) Orange C) Green D) Light blue
B) Orange
Where is the main valve located in a dry-barrel hydrant? A) In the riser B) Below the frost line C) In the bonnet D) At the discharge
B) Below the frost line
What is hard suction hose most commonly used for? A) Transferring water from a pressurized source to a pump B) Drafting from a static water source C) Relay pumping D) Filling a portable tank
B) Drafting from a static water source
The pipes that deliver water from the treatment facility for distribution are: A) secondaries. B) mains. C) distributors. D) trunks.
B) mains.
Where is a dump valve located? A) On a portable water tank B) At the lowest point in a water system C) On a mobile water supply apparatus D) At the end of a dead-end main
C) On a mobile water supply apparatus
Which is the fastest way for a mobile water supply apparatus to offload water into a portable tank? A) Connect to the drafting pumper B) Use the dump valve C) Use a jet siphon D) Use large-diameter hose
B) Use the dump valve
Fire hydrants should be inspected at least once every _____ months. A) 6 B) 12 C) 18 D) 24
B) 12
Which is the NFPA color code for a hydrant flowing 1000 to 1499 gpm (3785 to 5674 lpm)? A) Yellow B) Light blue C) Green D) Orange
C) Green
39.C) 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? A) 12" (30 cm) B) 18" (45 cm) C) 24" (60 cm) D) 30" (75 cm)
B) 18" (45 cm)
On a wet-barrel hydrant, where is the valve located? A) On each outlet B) At the base C) In the bonnet D) In the barrel
A) On each outlet
Friction loss is __________ proportional to the length of a hose. A) directly B) variably C) inversely D) indirectly
A) directly
Which term means the amount of energy in water? A) Flow B) Watts C) Volume D) Pressure
D) Pressure
A jet siphon is used for which application? A) Expediting discharge from a mobile water supply apparatus B) Exhausting air from hard suction C) Priming a dry pump D) Transferring water between portable tanks
D) Transferring water between portable tanks
In general, mobile water supply apparatus (tankers) carry __________ of water. A) 1000 or fewer gal (3785 L or fewer) B) 1000 to 3500 gal (3785 to 13,249 L) C) 2000 to 5000 gal (7570 to 18,927 L) D) 3000 to 6000 gal (11,356 to 22,712 L)
B) 1000 to 3500 gal (3785 to 13,249 L)
The quantity of water that is being moved through a pipe or hose is termed the: A) pressure. B) flow. C) throughput. D) stream.
B) flow.
How close must a fire engine get to a static water source to be able to draft directly from it through hard suction hose? A) A distance equal to the total length of the available hard suction hose minus 10 ft B) 10 ft (3 m) C) 20 ft (6 m) D) 30 ft (9 m)
C) 20 ft (6 m)
Which is one of the four factors that determine friction loss? A) Ambient temperature B) Hose diameter C) Atmospheric pressure D) Water source
B) Hose diameter
Which is the term for the large discharge opening on a fire hydrant? A) Steamer B) Deluge C) Main D) Primary
A) Steamer
Where are dry-barrel hydrants typically located? A) Static water supplies B) Cold climates C) Dedicated fire protection water systems D) Areas subject to frequent vandalism
B) Cold climates
Another term for head pressure is __________ pressure. A) static B) elevation C) flow D) residual
B) elevation