Which is the correct formula for Net Pump Discharge Pressure?

Pump Discharge Pressure − Intake Reading

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.

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

5 psi x (number of stories − 1)

Pressures for standpipe operations for fire departments may be:

labeled on the faceplate of the fire department connection.

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

Nozzle pressure plus total pressure loss

f a jurisdiction is performing tests using equipment they own to achieve more accurate results, the testing should

use actual hose that will be used during firefighting operations.

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

need only be made for one line.

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.

A pumper is being supplied by another pumper, net pump discharge pressure is the difference between discharge pressure&

incoming pressure from supply source.

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

calculate friction loss for hoseline by sep. discharges to indiv. nozzles.

Which BEST describes friction loss for master stream appliances?

25 psi (175 kPa) for all appliances

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

must be considered as part of the total pressure loss.

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 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 for each other than master stream devices.

Which BEST describes friction loss for handline nozzles?

Generally considered to be insignificant

When determining friction loss in a wyed hoseline which the hoselines have the same nozzle pressure, length, & diameter:

only one of the wyed hoselines need to be considered.

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

relied upon for safe fireground operations.

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)

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Driver/Operator Quiz 7

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Questions 32

Answers

1
Which is the correct formula for Net Pump Discharge Pressure?
Pump Discharge Pressure ÷ Total Pressure
Pump Discharge Pressure + Intake Reading
Pump Discharge Pressure − Intake Reading
Pump Discharge Pressure − Residual Pressure
2
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.
3
Which method of determining friction loss involves the use of in-line gauges to measure friction loss at various flows?
Historical information
Performing tests
Manufacturer guidelines
Using calculations
4
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 each line
can be estimated.
5
In the formula for friction loss, the “L” refers to:
hose length.
friction loss coefficient.
distance of fire stream.
flow rate.
6
Which customary formula would be used to determine elevation pressure in a multistory building?
10 psi x (number of stories − 1)
1 psi x (number of stories − 1)
15 psi x (number of stories − 2)
5 psi x (number of stories − 1)
7
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)
Low pressure fog nozzle
Solid stream nozzle (handline)
Fog nozzle
8
Pressures for standpipe operations for fire departments may be:
labeled on the faceplate of the fire department connection.
listed on the building entrance information.
kept with building maintenance.
posted on entry and exit passageways in the building.
9
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
Solid stream nozzle (master stream)
Low pressure fog nozzle
10
Which is the correct customary formula for determining pump discharge pressure?
Elevation loss plus friction loss minus nozzle pressure
Friction loss plus elevation loss multiplied by total pressure loss
Nozzle pressure divided by total pressure loss
Nozzle pressure plus total pressure loss
11
For which of the following is a nozzle pressure of 100 psi (700 kPa) a safe and efficient nozzle pressure?
Solid stream nozzle (handline)
Fog nozzle
Solid stream nozzle (master stream)
Low pressure fog nozzle
12
f a jurisdiction is performing tests using equipment they own to achieve more accurate results, the testing should
use different diameters of hose & then take an average of the test results.
use both older and new hose and then taking an average of the test results.
use hose that is different than hose used during firefighting operations.
use actual hose that will be used during firefighting operations.
13
When using multiple hoselines of equal length and diameter, loss calculations:
are too difficult to perform.
can be estimated.
need only be made for one line.
must be made for each line
14
Which customary formula would be used to conduct elevation pressure loss calculations on the fireground?
0.5 x Height in feet
1.0 x Height in feet
0.10 x Height in feet
0.25 x Height in feet
15
Which method of determining friction loss relies on the use of mathematical equations or field application methods?
Performing tests
Manufacturer guidelines
Using calculations
Historical information
16
What is the primary consideration for friction loss?
Length of hose lay
Volume of water flowing per minute
Experience of firefighters
Elevation differences
17
The current formula for friction loss accounts for the diameter of the hose, the volume of water flowing, and the:
level of elevation.
length of the hose layout.
distance of fire stream.
expected time.
18
The pump discharge pressure should be calculated and set based on:
median of lowest and highest pressure requirements.
hoseline with the greatest pressure requirement.
hoseline most likely to be used more during operations.
average of all hoseline pressure requirements
19
A pumper is being supplied by another pumper, net pump discharge pressure is the difference between discharge pressure&
combined total pressure of both pumpers.
average total pressure of both pumpers.
incoming pressure from supply source.
outgoing pressure from supply source.
20
To calculate friction loss when using multiple hoselines of unequal length, a driver/operator must:
calculate friction loss for hoseline by sep. discharges to indiv. nozzles.
calculate friction loss for only one hoseline and then estimate the other.
calculate friction loss for longest hoseline & double that # for the totol
use estimates because calculations are too complex.
21
Which BEST describes friction loss for master stream appliances?
Generally considered to be one-half of rated loss
10 psi (70 kPa) loss for each appliance
Generally considered to be insignificant
25 psi (175 kPa) for all appliances
22
When determining pressure loss for elevated waterways, the elevation of the master stream:
increases total pressure loss by 15 percent of height.
is not considered as it does not significantly affect pressure loss.
increases total pressure loss by 10 percent of height.
must be considered as part of the total pressure loss.
23
When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately:
the same as 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
10 percent more than that of a single hoseline at the same nozzle pressure.
24
Total pressure loss includes friction loss and elevation pressure loss combined with the loss associated with:
evaporation.
improper use of equipment.
variation in temperatures.
appliances
25
Pump discharge pressure must be sufficient to overcome:
125 percent of all pressure loss.
at least 75 percent of pressure loss.
50 percent of pressure loss.
all pressure loss.
26
Which is a friction loss guideline in a hose assembly when flowing 350 gpm (1 400 L/min) or greater?
There is a loss of 25 psi (175 kPa) in all appliances.
Friction loss is generally considered to be one-half of rated loss.
Friction loss is generally considered to be insignificant.
There is a loss of 10 psi for each other than master stream devices.
27
Which BEST describes friction loss for handline nozzles?
25 psi (175 kPa) loss for handline nozzles, regardless of flow
0 psi (0 kPa) loss for all appliances, regardless of flow
Generally considered to be insignificant
Generally considered to be one-half of rated loss
28
Which of the following is the formula for friction loss?
FL= CQ²L
FL= CQ² ÷ L
FL= CQ²L x 2
FL= CL2Q
29
Which metric formula would be used to calculate elevation pressure loss on the fireground?
10 x Height in meters
1 x Height in meters
5 x Height in meters
12 x Height in meters
30
When determining friction loss in a wyed hoseline which the hoselines have the same nozzle pressure, length, & diameter:
only one of the wyed hoselines need to be considered.
both of the wyed hoselines need to be considered.
calculations can be estimated.
calculations are too difficult to make.
31
The use of standard formulas and field applications for determining friction loss are generally
the same as actual testing results.
relied upon for safe fireground operations.
not considered reliable for safe fireground operations.
very different than actual testing results.
32
For which of the following is a nozzle pressure of 80 psi (560 kPa) a safe and efficient nozzle pressure?
Low pressure fog nozzle
Solid stream nozzle (handline)
Fog nozzle
Solid stream nozzle (master stream)

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