Chapter 7

Question 1

The primary function of a D/O on the fireground is to provide water to attack crews in sufficient _____ and _______ to achieve control and extinguishment of fires.

Answer 1

volume and pressure

Question 2

The development of proper pump discharge pressures is paramount to safe and efficient _______

Answer 2

operations

Question 3

D/Os rate perform ________calculations on the fireground.

Answer 3

Theoretic

Question 4

undwerstanding the factors that influence flow rates provides:
1.
2.
3.

Answer 4

1. A better understanding of basis for methods of fire pump theory
2. The ability to predetermine approximate pump discharge pressures for pre connected hoselines and common hose lays for the App
3. The skill to conduct preincident planning of hose deployment at target hazards or unusual occupancies in the jurisdiction.

Question 5

Chapter 7 has the following examples
1. Friction loss coefficients
2. Appliance pressure loss
3. Elevation pressure
4. Hose layout applications
5. pump discharge pressure

Question 6

It is necessary to know the ammount of friction loss, however, the PRIMARY consideration is the ______ of water flowing per minute

Answer 6

volume

Question 7

Friction loss, elevation loss or gain and loss associated with appliances all are added to create ________ Pressure Loss

Answer 7

Total Pressure Loss

Question 8

Friction loss may be determine by using __________ or for more precise infoermation by performing tests using __-____ guages

Answer 8

in-line guages

Question 9

The ONLY truly accurate method for determining pressure loss in a particular hose lay involves measuring loss of a particular hose lay which involves measuring the _____ at both ends of the hoseline and subtracting the difference

Answer 9

pressure

Question 10

The use of standard formulas and field applications often are reasonably close to measuring pressurized hose and the formulas are ____ upon for safe fireground operations.

Answer 10

safe

Question 11

When a jurisdictions tests hose and are determining Friction Loss Coefficients,
1. conduct test with the actual hose that will be used
2. Test one diameter of hose at a time. As well as same construction and manufacturer
3.Base results on the measuring equipment being used.

Question 12

When using a Pitot tube you must use a ____ nozzle and can use any type of nozzle for a ________meter

Answer 12

smooth bore
any nozzle for flowmeter

Question 13

An appliance is any nozzle, wye, siamese, deluge monitor, reducers, increasers or other hardware used in conjuntion with fire hose for purposes of delivering ______

Answer 13

water

Question 14

Friction loss where to total through the appliance is less than _____gpm is considered insignificant

Answer 14

350

Question 15

A friction loss of ____psi is used for all master streams regardless of of flow is used

Answer 15

25 psi

Question 16

a ____psi loss for each appliance in a hose assembly when flowing _____gpm or more

Answer 16

10 psi

Question 17

Friction loss for handline nozzles is ____ to be considered

Answer 17

NOT

Question 18

_________ pressure is created by the difference between the nozzle and the pump

Answer 18

elevation

Question 19

For each hose layout, friction loss is affected by factors like ______ of hose and _____ of hose

Answer 19

diameter and length

Question 20

Total Pressure loss involves friction loss, _______ gain or loss and Appliance _____ loss when flows exceed 350gpm

Answer 20

elevation
friction

Question 21

When using more than one hoseline of equal length and equal diameter, friction loss calculations need only be made for _____ line. When diameters vary, calculations must be made for _____ hose line.

Answer 21

one

each

Question 22

Fireground ops include a ___, ____ or ___ inch hoseline wyed into two or more smaller lines for fire attack.

Answer 22

2 1/2, 3, and 4 inch

Question 23

Attack lines generally range from ____to____ inches in diameter.

Answer 23

1 1/2 - 2 1/2

Question 24

Attack line of a wye must be the same length and diameter to avoid having two different _____ pressures.

Answer 24

different

Question 25

When two hose lines of equal length are siamesed to supply a stream, friction loss is approximately ____% less than that of a single hoseline at the same nozzle pressure.

Answer 25

25% less

Question 26

A siamese is usually found near the _____

Answer 26

fire

Question 27

PDP= NP + TPL
This is the actually pressure as it leaves ______

Answer 27

the pump

Question 28

Pump Discharge Pressure is the pump intake pressure plus the net ______ ______ pressure

Answer 28

pump discharge pressure

Question 29

The Net Pump Discharge Pressure is that actual amount of pressure being produced by the ______. Or the difference between the _____pressure and the discharge pressure. NPDP = PDP- _____

Answer 29

Pump

intake.

intake pressure

Question 30

Solid stream nozzle 50psi
solid stream master stream, 80 psi
Fog nozzle: 100 psi
low level fog nozzle 50-75 psi

Question 31

A D/O must be able to make certain hydraulic calculations in the field on order to operate _____ and _____

Answer 31

safely and efficiently

Question 32

Coefficients for a specific hose will vary on the ______ and the ______ of the hose

Answer 32

manufacturer and the condition

Question 33

When pressure testing hose, insert a guage between the _____ and ______ section of hose

Answer 33

first and second

Question 34

Insert gauge one ____ or _____ feet from pumper depending on which hose you are using. Insert gauge two ____ feet from gauge one regardless of hose length being used. Depending on hose length, gauge two should be ____ or ____ feet from the nozzle.

Answer 34

50 or 100ft

200 feet

50-100 feet

Question 35

If using a portable flowmeter do NOT position it between the _____ gauges. However it may be inserted ______ else.

Answer 35

test gauges

anywhere

Question 36

A hose test should be run ____ to____ times at the same pressure.

Answer 36

3-4 times.

Question 37

inline gauges should be calibrated within ____psi of one another.

Answer 37

5 psi