Chapter 7 Flashcards
(46 cards)
1.What is the primary consideration for friction loss? (210)
A.Length of hose lay
B.Elevation differences
C.Experience of firefighters
D.Volume of water flowing per minute
D.Volume of water flowing per minute
2.Total pressure loss includes friction loss and elevation pressure loss combined with the loss associated with: (210)
A.appliances.
B.evaporation.
C.variation in temperatures.
D.improper use of equipment.
A.appliances.
3.Which method of determining friction loss involves the use of in-line gauges to measure friction loss at various flows through specific hose layouts? (211)
A.Performing tests
B.Using calculations
C.Historical information
D.Manufacturer guidelines
A.Performing tests
4.Which method of determining friction loss relies on the use of mathematical equations or field application methods? (211)
A.Performing tests
B.Using calculations
C.Historical information
D.Manufacturer guidelines
B.Using calculations
5.The use of standard formulas and field applications for determining friction loss are generally: (211)
A.the same as actual testing results.
B.very different than actual testing results.
C.relied upon for safe fireground operations.
D.not considered reliable for safe fireground operations.
C.relied upon for safe fireground operations.
6.The current formula for friction loss accounts for the diameter of the hose, the volume of water flowing, and the: (212)
A.expected time.
B.level of elevation.
C.distance of fire stream.
D.length of the hose layout.
D.length of the hose layout.
7.Which of the following is the formula for friction loss? (212)
A.FL= CQ²L
B.FL= CL2Q
C.FL= CQ²L x 2
D.FL= CQ² ÷ L
A.FL= CQ²L
8.In the formula for friction loss, the “L” refers to: (212)
A.flow rate.
B.hose length.
C.distance of fire stream.
D.friction loss coefficient.
B.hose length.
9.If a jurisdiction is performing tests using equipment they own in order to achieve more accurate results, the testing should be conducted: (212)
A.using actual hose that will be used during firefighting operations.
B.using hose that is different than hose used during firefighting operations.
C.using both older and new hose and then taking an average of the test results.
D.using different diameters of hose and then taking an average of the test results.
A.using actual hose that will be used during firefighting operations.
10.Which is a friction loss guideline in a hose assembly when flowing 350 gpm (1 400 L/min) or greater? (213)
A.There is a loss of 25 psi (175 kPa) in all appliances.
B.Friction loss is generally considered to be insignificant.
C.Friction loss is generally considered to be one-half of rated loss.
D.There is a loss of 10 psi (70 kPa) for each appliance, other than master stream devices.
D.There is a loss of 10 psi (70 kPa) for each appliance, other than master stream devices.
11.Which BEST describes friction loss for master stream appliances? (213)
A.25 psi (175 kPa) for all appliances
B.10 psi (70 kPa) loss for each appliance
C.Generally considered to be insignificant
D.Generally considered to be one-half of rated loss
A.25 psi (175 kPa) for all appliances
12.Which BEST describes friction loss for handline nozzles? (213)
A.0 psi (0 kPa) loss for all appliances, regardless of flow
B.25 psi (175 kPa) loss for handline nozzles, regardless of flow
C.Generally considered to be insignificant
D.Generally considered to be one-half of rated loss
C.Generally considered to be insignificant
13.Which customary formula would be used to conduct elevation pressure loss calculations on the fireground? (214)
A.0.10 x Height in feet
B0.25 x Height in feet
C.0.5 x Height in feet
D.1.0 x Height in feet
C.0.5 x Height in feet
14.Which metric formula would be used to calculate elevation pressure loss on the fireground? (214)
A.1 x Height in meters
B.5 x Height in meters
C.10 x Height in meters
D.12 x Height in meters
C.10 x Height in meters
15.Which customary formula would be used to determine elevation pressure in a multistory building? (214)
A.1 psi x (number of stories − 1)
B.5 psi x (number of stories − 1)
C.10 psi x (number of stories − 1)
D.15 psi x (number of stories − 2)
B.5 psi x (number of stories − 1)
16.When using multiple hoselines of equal length and diameter, loss calculations: (215)
A.can be estimated.
B.are too difficult to perform.
C.must be made for both lines.
D.need only be made for one line.
D.need only be made for one line.
17.When using multiple hoselines of equal length but different diameter, loss calculations: (215)
A.can be estimated.
B.are too difficult to perform.
C.must be made for each line.
D.need only be made for one line.
C.must be made for each line.
18.When determining friction loss in a wyed hoseline in which the hoselines have the same nozzle pressure, hose length, and diameter: (215)
A.calculations can be estimated.
B.calculations are too difficult to make.
C.both of the wyed hoselines need to be considered.
D.only one of the wyed hoselines need to be considered.
D.only one of the wyed hoselines need to be considered.
19.When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately: (216)
A.the same as that of a single hoseline at the same nozzle pressure.
B.25 percent less than that of a single hoseline at the same nozzle pressure.
C.10 percent more than that of a single hoseline at the same nozzle pressure.
D.50 percent less than that of a single hoseline at the same nozzle pressure.
B.25 percent less than that of a single hoseline at the same nozzle pressure.
20.Pressures for standpipe operations for fire departments may be: (216)
A.kept with building maintenance.
B.listed on the building entrance information.
C.posted on entry and exit passageways in the building.
D.labeled on the faceplate of the fire department connection.
D.labeled on the faceplate of the fire department connection.
21.To calculate friction loss when using multiple hoselines of unequal length, a driver/operator must: (216)
A.use estimates because calculations are too complex.
B.calculate friction loss for only one hoseline and then estimate the other.
C.calculate friction loss for the longest hoseline and double that number for the total.
D.calculate friction loss for each hoseline supplied by separate discharges to individual nozzles.
D.calculate friction loss for each hoseline supplied by separate discharges to individual nozzles.
22.Which statement about adding unequal lengths of hose to an established wyed hose layout is MOST accurate? (217)
A.Friction loss must be determined for each attack line.
B.Friction loss can be assumed to be the same for all attack lines.
C.Friction loss only needs to be determined for the initial attack line.
D.Friction loss in a wyed hose layout does not need to be considered.
A.Friction loss must be determined for each attack line.
23.When determining pressure loss for elevated waterways, the elevation of the master stream: (218)
A.increases total pressure loss by 10 percent of height.
B.increases total pressure loss by 15 percent of height.
C.must be considered as part of the total pressure loss.
D.is not considered as it does not significantly affect pressure loss.
C.must be considered as part of the total pressure loss.
24.Pump discharge pressure must be sufficient to overcome: (218)
A.all pressure loss.
B.50 percent of pressure loss.
C.at least 75 percent of pressure loss.
D.125 percent of all pressure loss.
A.all pressure loss.
