Chapter 7 Flashcards
Which of the following statements about pump discharge pressure is MOST accurate?
Pump discharge pressure must be sufficient to overcome all pressure loss.
Which of the following BEST describes friction loss for handlline nozzles?
Generally considered to be insignificant
The pump discharge pressure should be calculated and set based on:
hoseline with the greatest pressure requirement.
When determining pressure loss for elevated waterways, the elevation of the master stream:
must be considered as part of the total pressure loss.
Which method of determining friction loss relies on the use of mathematical equations or field application methods?
Using calculations
Total pressure loss includes friction loss and elevation pressure loss combined with the loss associated with:
appliances
In the formula for friction loss, the “L” refers to:
hose length
Which of the following is a friction loss guideline in a hose assembly when flowing 350 gpm (1 400 L/min) or greater?
There is a loss of 10 psi (70 kPa) for each appliance, other than master stream devices.
Which method of determining friction loss involves the use of in-line gauges to measure friction loss at various flows through specific hose layouts?
Performing tests
Which of the following customary formulas would be used to determine elevation pressure in a multistory building?
5 psi × (number of stories - 1)
When a pumper is being supplied by another pumper, net pump discharge pressure is the difference between pump discharge pressure and:
incoming pressure from supply source.
Which of the following is the correct formula for Net Pump Discharge Pressure?
Pump Discharge Pressure - Intake Reading
To calculate friction loss when using multiple hoselines of unequal length, a driver/operator must:
calculate friction loss for each hoseline supplied by separate discharges to individual nozzles.
Which of the following is the correct customary formula for determining pump discharge pressure?
Nozzle pressure plus total pressure loss
Which of the following BEST describes friction loss for master stream appliances?
25 psi (175kPa) for all appliances
When using multiple hoselines of equal length and diameter, loss calculations:
need only be made for one line.
If a jurisdiction is performing tests using equipment they own in order to achieve more accurate results, the testing should be conducted:
using actual hose that will be used during firefighting operations.
The current formula for friction loss accounts for the diameter of the hose, the volume of water flowing, and the:
length of the hose layout.
Which of the following statements about adding unequal lengths of hose to an established wyed hose layout is MOST accurate?
Friction loss must be determined for each attack line.
Which of the following customary formulas would be used to conduct elevation pressure loss calculations on the fireground?
0.5 × Height in feet
Which of the following is the primary consideration for friction loss?
Volume of water flowing per minute GPM
When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately:
25 percent less than that of a single hoseline at the same nozzle pressure.
The use of standard formulas and field applications for determining friction loss are generally:
relied upon for safe fireground operations.
When using multiple hoselines of equal length but different diameter, loss calculations:
must be made for both lines.
When determining friction loss in a wyed hoseline in which the hoselines have the same nozzle pressure, hose length, and diameter:
only one of the wyed hoselines need to be considered.
