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