Chapter 8 Theoretical Pressure Calculations (U.S.) Flashcards Preview

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Flashcards in Chapter 8 Theoretical Pressure Calculations (U.S.) Deck (29):
1

Why is it necessary to know the amount of friction and pressure loss in fire hose?

To produce effective fire streams

2

Which of the following is NOT a cause of friction loss?

A. Hose condition
B. Hydrant condition*
C. Coupling condition
D. Volume of water flowing per minute

3

The calculation of friction loss must take into account the:

length and diameter of the hoseline.

4

Together, friction loss and elevation pressure loss are referred to as:

total pressure loss.

5

FL: In order to get results indicative of averages that can be expected on the fireground, it is necessary to test:

the same hose that would be used on the fireground.

6

FL: Departments should test:

only one type of hose at a time.

7

FL: If testing lengths of 50-feet hose, lay out:

300 feet of hose.

8

FL: If testing lengths of 100-feet hose, lay out:

400 feet of hose.

9

FL: If using a pitot tube to determine the nozzle pressure and corresponding flow of water, use:

a smoothbore nozzle.

10

FL: If using a flowmeter to determine the nozzle pressure and corresponding flow of water, use:

any nozzle.

11

FL: Insert gauge one in the hoseline at the connection between the first and second sections of hose away from the discharge. Insert gauge two:

200 feet from gauge one.

12

FL: How many test runs should be made for each size hose?

Three to four

13

Appliance friction loss is insignificant in cases where the total flow through these appliances is less than:

350 gpm.

14

Assume a ___ loss for loss for flows less than 350 gpm.

0 psi

15

Assume a ___ loss for each appliance in a hose assembly when flowing 350 gpm or more.

10 psi

16

Friction loss caused by ___ is generally insignificant in the overall pressure loss in a hose assembly.

handline nozzles

17

Assume a friction loss of ___ in all master stream appliances, regardless of the flow.

25 psi

18

Elevation pressure is created by elevation differences between:

the nozzle and the pump.

19

Water exerts a pressure of ___ per foot of elevation.

0.434 psi

20

When a nozzle is operating at an elevation higher than the apparatus, this is known as:

elevation pressure loss

21

Operating a nozzle lower than the pump results in:

elevation pressure gain

22

Which of the following is NOT a simple hose layout?

A. Single hoseline
B. Standpipe operations*
C. Siamesed hoselines (equal length)
D. Wyed hoselines (equal length)

23

Which of the following is the most commonly used hose lay?

A. Single hoseline*
B. Multiple hoselines (equal length)
C. Siamesed hoselines (unequal length)
D. Wyed hoselines (equal length)

24

Which of the following presents the simplest friction loss calculations?

A. Single hoseline*
B. Multiple hoselines (equal length)
C. Siamesed hoselines (equal length)
D. Wyed hoselines (unequal length)

25

When determining the loss in equal length multiple lines whose diameters are the same, it is necessary to perform calculations for:

only one line.

26

When the diameters of hoselines vary, friction loss calculations must be made for each hoseline, and then set for:

the highest pressure.

27

When using a wye, it is important that the attack lines wyed from the supply line are:

the same length and diameter.

28

Which of the following is NOT a complex hose layout?

A. Manifold hoselines
B. Standpipe operations
C. Wyed hoselines (equal length)*
D. Multiple hoselines (unequal length)

29

In most cases, fire departments have predetermined pressures for:

Standpipe operations