Fire Officer Handbook of Tactics Part 2

Question 1

Basic components for CAFS

Answer 1

-foam concentrate supply-injection device (Class A 0.3-0.6%, Class B 3-6%)-source of compressed air to inject into solution

Question 2

Claims have been made that a CAFS stream can knock down a fire in ___ the time of a conventional hoseline using only ___ the water

Answer 2

1/41/3

Question 3

Current disadvantages of CAFS

Answer 3

fairly complex system that requires maintenance-not seen as cost effective-reliability of components

Question 4

Can be used to extinguish gasoline truck fire from greater safety

Answer 4

Bent applicator - supplied with AFFF or using dry chem from an extinguisher after removing the fog head

Question 5

Characteristic of AFFF that makes it ideal for fighting gasoline truck fires as opposed to protein foam

Answer 5

does not require a great deal of aeration so less splashing than high velocity types

Question 6

An innovative way to fight fires involving the undercarriages of many of the heavier motor vehicles

Answer 6

using a bent applicator

Question 7

Uses for the piercing applicator (3)

Answer 7

car fires (hood/trunk), cockloft, deep-seated fires in baled materials

Question 8

Putting the proper size hoseline at the required place in the least possible time with the most efficient use of personnel is the job of the

Answer 8

engine company

Question 9

Even a flimsy hollow-core wooden door has some containment value if

Answer 9

it is closed

Question 10

A unit that only responds to single-story homes built on slabs will probably be able to use ___ hose to good advantage, while units that face larger homes and those with basements or cellars may require ___

Answer 10

1 ½-in1 ¾- or 2-in hose

Question 11

Ensuring that the proper volume of water is available at the required location on the fireground

Answer 11

Water supply

Question 12

1 cu ft of water weighs about ___ and is equal to about ___ gallons

Answer 12

62.5 lbs7.5

Question 13

Fluid pressure is ___ to the surface on which it acts

Answer 13

perpendicular

Question 14

The pressure in a confined body of water at rest is the ___

Answer 14

same at all points

Question 15

The pressure of a fluid in an open container is ___

Answer 15

proportional to its depth

Question 16

For every foot of height that the water rises, it exerts ___ of force. This is known as ___

Answer 16

.434 psihead pressure

Question 17

The pressure of water in an open container is independent of the shape and volume of the container. It depends solely on ___

Answer 17

depth

Question 18

The pressure a fluid exerts is proportional to the ___ of that fluid

Answer 18

density

Question 19

If the intake of the pump is ___ above the surface of the liquid at any time, it will be physically impossible to draft

Answer 19

34 ft (33.9 ft)

Question 20

Pressure on a confined fluid is transmitted ___ throughout that fluid

Answer 20

equally (this is why fire hose can be tested in multiple sections)

Question 21

Most common resistance to water flow

Answer 21

friction loss - mostly caused by turbulence of the water

Question 22

Low flow where there is almost no turbulence and all water molecules move along quite smoothly

Answer 22

laminar flow

Question 23

Factors involved in supply capabilities (3)

Answer 23

capacity of the pump-capacity of the supply source-capacity of the hose

Question 24

Items that should be known by pump operators and company/chief officers before the incident

Answer 24

rating of the pump-discharge characteristics of nozzles-capacity and length of hoselines-general idea of areas water supplies

Question 25

Having a hydrant in front of the house does not ensure

Answer 25

adequate water supply

Question 26

Static pressure is no indicator of the ___ of water available at a hydrant

Answer 26

volume

Question 27

Low flowing pressure often indicates that the pumper should be placed ___. This is a good policy for all but the ___.

Answer 27

near the hydrant rather than near the fireinitial-arriving engine company

Question 28

Minimum residual pressure that should be allowed is

Answer 28

10 psi except when drafting

Question 29

Occurs when there isn’t enough water in the pump to supply the demand

Answer 29

cavitation

Question 30

Two possible actions to take to keep pressure from going below 10 psi

Answer 30

reduce the discharge flow (not desirable)-increase the supply with another source (may not be possible)

Question 31

At a house fire, ___ takes priority over ___, due to the potential life hazard and the relatively small fire area and light fire loading

Answer 31

speed of water deliverygpm deliverd

Question 32

Inline pumping (pumping at the house vs from the hydrant) for private dwelling fires has the advantage of speed which is ideal, but still has the disadvantage that

Answer 32

maximum flows aren’t available

Question 33

Centrifugal pumps will deliver increasingly ___ flows as the pressure is ___

Answer 33

lower increased

Question 34

For relay pumping, the problem isn’t always best solved by a bigger pump. It might be more cost-effective to correct the___

Answer 34

hose size (diameter) of the water supply line

Question 35

Drawback of automatic nozzles, particularly on master stream devices

Answer 35

Stream looks just as good at different gpm levels so you may not be delivering enough water

Question 36

It would be prudent to restrict the use of 4” hose to pumpers of ___

Answer 36

1,000 gpm capacity or less

Question 37

One of the advantages of LDH

Answer 37

allows for rapid deployment and return to service with minimum personnel

Question 38

Using LDH to take advantage of its low friction loss is normally best accomplished by using the the hose as

Answer 38

an inline supply

Question 39

The most versatile, most highly maneuverable master stream on the fireground today

Answer 39

tower ladder

Question 40

One of the most common reasons for deploying a master stream

Answer 40

fire has extended into the cockloft

Question 41

Telescoping boom vs articulating boom devices for taxpayer fires

Answer 41

Telescoping booms are superior since the front of the building may contain power lines

Question 42

Advantages of platform (tower ladder) vs ladder pipes for (2)

Answer 42

-capable of flowing 1500 gpm vs 800 gpm-range of motion of the stream (most pronounced when operating stream through windows)

Question 43

One easy way to take much of the difficulty out of water supply is to use ___ in conjunction with pressure gauges

Answer 43

flow meters

Question 44

One complicating factor in the use of flow meters is

Answer 44

manually adjustable nozzles that allow nozzle operator to manually select a wide range of flows

Question 45

Most satisfactory method to supply large flows is to use

Answer 45

large hose

Question 46

If LDH isn’t available, the next best option is to use

Answer 46

multiple lines

Question 47

Even more important [regarding water supply] is to understand that it is ___ that puts it out, not the pressure at which it is applied

Answer 47

the amount of water that is applied to the fire