jurisdiction is performing tests using equipment they own; to achieve more accurate results,testing should be conducted

using actual hose that will be used during firefighting operations.

Which is the correct formula for Net Pump Discharge Pressure?

Pump Discharge Pressure - Intake Reading

The use of standard formulas and field applications for determining friction loss are generally:

relied upon for safe fireground operations.

What is the primary consideration for friction loss?

Volume of water flowing per minute

The pump discharge pressure should be calculated and set based on:

hoseline with the greatest pressure requirement.

Which customary formula would be used to determine elevation pressure in a multistory building?

5 psi × (number of stories - 1)

Which BEST describes friction loss for master stream appliances?

25 psi (175 kPa) for all appliances

Which BEST describes friction loss for handline nozzles?

Generally considered to be insignificant

When using multiple hoselines of equal length and diameter, loss calculations:

need only be made for one line.

To calculate friction loss when using multiple hoselines of unequal length, a driver/operator must:

calculate friction loss for each hoseline

Which is the correct customary formula for determining pump discharge pressure?

Nozzle pressure plus total pressure loss

When determining pressure loss for elevated waterways, the elevation of the master stream:

must be considered as part of the total pressure loss.

When determining friction loss in a Y hoseline in which the hoseline have the same nozzle pressure hoselength & diameter

only one of the wyed hoselines need to be considered.

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.

Which statement about adding unequal lengths of hose to an established wyed hose layout is MOST accurate?

Friction loss must be determined for each attack line.

For which of the following is a nozzle pressure of 80 psi (560 kPa) a safe and efficient nozzle pressure?

Solid stream nozzle (master stream)

Pressures for standpipe operations for fire departments may be:

labeled on the faceplate of the fire department connection.

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Ch7 Theoretical Pressure Calculations

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Questions 29

Answers

1
jurisdiction is performing tests using equipment they own; to achieve more accurate results,testing should be conducted
using different diameter of hose& then taking an average of the test result
using hose that is different than hose used during firefighting operations.
using actual hose that will be used during firefighting operations.
using both older and new hose and then taking an average of test results.
2
Which of the following is the formula for friction loss?
FL= CQ&squared;L
FL= CL&squared;Q
FL= CQ&squared; ÷ L
FL= CQ&squared;L × 2
3
Which is the correct formula for Net Pump Discharge Pressure?
Pump Discharge Pressure + Intake Reading
Pump Discharge Pressure - Intake Reading
Pump Discharge Pressure ÷ Total Pressure
Pump Discharge Pressure - Residual Pressure
4
The use of standard formulas and field applications for determining friction loss are generally:
relied upon for safe fireground operations.
very different than actual testing results.
the same as actual testing results.
not considered reliable for safe fireground operations.
5
What is the primary consideration for friction loss?
Elevation differences
Volume of water flowing per minute
Experience of firefighters
Length of hose lay
6
The pump discharge pressure should be calculated and set based on:
median of lowest and highest pressure requirements.
hoseline most likely to be used more during operations.
average of all hoseline pressure requirements.
hoseline with the greatest pressure requirement.
7
Which customary formula would be used to determine elevation pressure in a multistory building?
10 psi × (number of stories - 1)
1 psi × (number of stories - 1)
5 psi × (number of stories - 1)
15 psi × (number of stories - 2)
8
Which BEST describes friction loss for master stream appliances?
25 psi (175 kPa) for all appliances
Generally considered to be one-half of rated loss
Generally considered to be insignificant
10 psi (70 kPa) loss for each appliance
9
Which BEST describes friction loss for handline nozzles?
25 psi (175 kPa) loss for handline nozzles, regardless of flow
Generally considered to be one-half of rated loss
0 psi (0 kPa) loss for all appliances, regardless of flow
Generally considered to be insignificant
10
When using multiple hoselines of equal length and diameter, loss calculations:
can be estimated.
are too difficult to perform.
must be made for both lines.
need only be made for one line.
11
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.
distance of fire stream.
expected time.
level of elevation.
12
For which of the following is a nozzle pressure of 100 psi (700 kPa) a safe and efficient nozzle pressure?
Low pressure fog nozzle
Solid stream nozzle (master stream)
Fog nozzle
Solid stream nozzle (handline)
13
To calculate friction loss when using multiple hoselines of unequal length, a driver/operator must:
use estimates because calculations are too complex.
calculate friction loss for each hoseline
calculate friction loss for the longest hoseline & double that # for total.
calculate friction loss for only one hoseline and then estimate the other.
14
Which is the correct customary formula for determining pump discharge pressure?
Nozzle pressure divided by total pressure loss
Friction loss plus elevation loss multiplied by total pressure loss
Nozzle pressure plus total pressure loss
Elevation loss plus friction loss minus nozzle pressure
15
Which method of determining friction loss relies on the use of mathematical equations or field application methods?
Using calculations
Performing tests
Manufacturer guidelines
Historical information
16
When determining pressure loss for elevated waterways, the elevation of the master stream:
must be considered as part of the total pressure loss.
is not considered as it does not significantly affect pressure loss.
increases total pressure loss by 15 percent of height.
increases total pressure loss by 10 percent of height.
17
When determining friction loss in a Y hoseline in which the hoseline have the same nozzle pressure hoselength & diameter
calculations can be estimated.
calculations are too difficult to make.
both of the wyed hoselines need to be considered.
only one of the wyed hoselines need to be considered.
18
When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately:
10 percent more than that of a single hoseline at the same nozzle pressure.
25 percent less than that of a single hoseline at the same nozzle pressure.
50 percent less than that of a single hoseline at the same nozzle pressure.
the same as that of a single hoseline at the same nozzle pressure.
19
Which customary formula would be used to conduct elevation pressure loss calculations on the fireground?
1.0 × Height in feet
0.10 × Height in feet
0.25 × Height in feet
0.5 × Height in feet
20
For which of the following is a nozzle pressure of 50 psi (350 kPa) a safe and efficient nozzle pressure?
Solid stream nozzle (handline)
Fog nozzle
Low pressure fog nozzle
Solid stream nozzle (master stream)
21
Which statement about adding unequal lengths of hose to an established wyed hose layout is MOST accurate?
Friction loss must be determined for each attack line.
Friction loss in a wyed hose layout does not need to be considered.
Friction loss only needs to be determined for the initial attack line.
Friction loss can be assumed to be the same for all attack lines.
22
When using multiple hoselines of equal length but different diameter, loss calculations:
are too difficult to perform.
need only be made for one line.
must be made for both lines.
can be estimated.
23
In the formula for friction loss, the "L" refers to:
distance of fire stream.
friction loss coefficient.
hose length.
flow rate.
24
Total pressure loss includes friction loss and elevation pressure loss combined with the loss associated with:
appliances.
variation in temperatures.
evaporation.
improper use of equipment.
25
For which of the following is a nozzle pressure of 80 psi (560 kPa) a safe and efficient nozzle pressure?
Low pressure fog nozzle
Fog nozzle
Solid stream nozzle (handline)
Solid stream nozzle (master stream)
26
Pressures for standpipe operations for fire departments may be:
posted on entry and exit passageways in the building.
kept with building maintenance.
listed on the building entrance information.
labeled on the faceplate of the fire department connection.
27
Pump discharge pressure must be sufficient to overcome:
50 percent of pressure loss.
125 percent of all pressure loss.
all pressure loss.
at least 75 percent of pressure loss.
28
For which of the following is a nozzle pressure of 50 or 75 psi (350 or 525 kPa) a safe and efficient nozzle pressure?
Solid stream nozzle (master stream)
Solid stream nozzle (handline)
Fog nozzle
Low pressure fog nozzle
29
Which metric formula would be used to calculate elevation pressure loss on the fireground?
5 × Height in meters
1 × Height in meters
12 × Height in meters
10 × Height in meters

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