BOOK 83, Fire Investigation

Question 1

The primary responsibility to determine the cause of all fires, including all criminal and non criminal fires is?

Answer 1

The bureau of fire suppression and rescue (ESB)

Question 2

The responsibility for determining the most probable cause of a fire rest with?

Answer 2

The IC

Question 3

The follow up investigation responsibility of fires where the total loss is less that $25000 lies with?

Answer 3

ESB

Question 4

In this phase of a fire, air from surrounding atmosphere is drawn into the fire/ oxygen content is usually reduced to 16-18%. Flashover frequently occurs is this phase.

Answer 4

Free burning

Question 5

The chemical decomposition of matter through the action of heat describes?

Answer 5

Pyrolysis

Question 6

The lowest temp. Of a liquid in an open container at which vapors evolve fast enough to support continuous combustion describes?

Answer 6

Fire point

Question 7

Liquids having a flash point below 100F best describes?

Answer 7

Flammable liquid

Question 8

The transfer of heat from one new object to another through direct physical contact describes?

Answer 8

Conduction

Question 9

Carbon monoxide is one of the most common gases found in structural fires and is highly flammable. The explosive limit of carbon monoxide is?

Answer 9

12.5-74%

Question 10

Most fires can be divided into ? Separate phases.

Answer 10

3

Question 11

The responsibility for the investigation of fires is?

Answer 11

Shared between the ESB and the bureau of fire prevention

Question 12

The transfer of heat is unusually the key element in ignition of most fires. Heat is transferred in ? Ways.

Answer 12

4

Question 13

Flashover may cause an area to appear to have been exposed to flammable accelerants. Carful examination should indicate all of the following?

Answer 13

Burning over top surfaces of materials
Lack of accelerant residue
Lack of normal fire spread from point of origin

Question 14

As it relates to structural loads and loading, the weight of the building and any equip. Permanently attached or built in to a structure defines?

Answer 14

Dead loads

Question 15

Attic areas unprotected concealed space cannot exceed ? Square feet without fire walls.

Answer 15

3000

Question 16

The stage of the fire when all combustibles in an area have become heated to their ignition temp, then ignited simultaneously, describes?

Answer 16

Flashover

Question 17

The form of heat transfer most responsible for fire spread in structural fires is?

Answer 17

Convection

Question 18

The purpose of fire cause investigations is to establish?

Answer 18

How the fire started

The motive for starting it

Question 19

The ignition temp of ordinary combustibles is between?

Answer 19

300-1000 degrees

Question 20

The minimum temp. A which a liquid gives off vapors in sufficient concentrations to form an ignitable mixture with are near the structure of the liquid defines?

Answer 20

Flashpoint

Question 21

As a substance burns, it mixes with oxygen and produces heat best describes?

Answer 21

Oxidation

Question 22

The maximum vapor to air concentration above which propagation of flame will not occur best describes?

Answer 22

Upper flammable limit

Question 23

The authority granted the fire dept. to investigate fires occurring in the city of LA is found under?

Answer 23

The city charter

Question 24

Flashover is the stage of the fire when al combustibles In an area have become heated to their ignition temperature, then ignite simultaneously. Flashover occurs when heat produced but the fire collects at ceiling level, and is returned to lower areas by?

Answer 24

Thermal radiation feedback

Question 25

Accurate cause and origin determination requires the fire scene investigator to develop a well organized and coordinated procedure. The examination of the interior of the structure should be?

Answer 25

Wording from the least to the most damaged fire areas

Question 26

Which of the following factors do influence burn patterns?

Answer 26

Fuel load Venting FF activities Weather

Question 27

The normal growth of a fire is usually ?

Answer 27

Outward and upward

Question 28

Fire has four parts which are necessary for self sustaining, open flaming combustion. I the flame, many chemical reactions occur which produce additional het. When certain extinguishing agents are introduces, it breaks up this chemical reaction and extinguishes the fire without affecting the heat, fuel or oxygen sides of the fire trainable. These extinguishing agents are?

Answer 28

Dry chemical | Halon

Question 29

The foundation from which any fire cause investigation should be developed is?

Answer 29

Basic understanding of the behavior of fire

Question 30

In order to determine whether a flashover occurred, your examination should indicate?

Answer 30

Lack of normal fire spread from the point of origin

Question 31

The fundamental facts or elements necessary to prove the commission of a crime describes?

Answer 31

Corpus Delecti

Question 32

Free burning may cease in the fire area as the area fills with dense smoke. Oxygen may drop below 15 % and the temp. Reach 1000 degrees. Throughout the area. This is known as ?

Answer 32

Smoldering phase

Question 33

Type ? Construction is known as ordinary construction and is described as, construction in which exterior bearing walls or bearing partitions of exterior walls are of combustible materials and have a minimum hourly fire resistive rating. Word allowed for interior use.

Answer 33

TYPE III

Question 34

Which of the following be considered a sign of slow smoldering fire?

Answer 34

Uniform overhead damage A wide angle V pattern Large cracks and heavy smoke damage on glass

Question 35

When subjected to ? Degrees, light bulbs may swell toward the point of heat.

Answer 35

900

Question 36

Cigarettes may not ignite dry vegetation unless the real active humidity is under?

Answer 36

22 percent

Question 37

Two pressure waves result from an explosion. The negative wave has about ? Percent of the power developed by the positive wave.

Answer 37

60

Question 38

A backdraft is the rapid combustion of flammable gases that have been heated above their ignition point. The is condition develops due to insufficient oxygen. It usually occurs during the ? Phase of a fire as oxygen is introduced Tina the confined space .

Answer 38

Smoldering

Question 39

Determining the sauce and origin of a fire starts prior to arrival at the fire. One of your considerations should be the color of the fire and smoke. Little or no smoke is an indicator of?

Answer 39

Complete combustion

Question 40

Burn patterns are the burned areas as opposed to unturned areas and their relationship to each other. This will be indicated by angle, or where the burn is as opposed to where It is not. Which two method of transferring heat play a major role in producing burn patterns?

Answer 40

Convection and radiation

Question 41

In most cases, ghost marks are caused by the application of a flammable liquid to a surface covered with asphalt tile. Ghost marks have a ? Dis colored mark where the tile edge was located.

Answer 41

Dark

Question 42

The normal growth of a fire is usually upward and outward and a usual indicator that will point towards the origin of the fire is?

Answer 42

V patterns

Question 43

An exit hermitic reaction produces ?

Answer 43

Heat

Question 44

A fire where circumstances and logic indicate an incendiary fire, and an accident cause cannot be eliminated best defines?

Answer 44

Suspicious

Question 45

The are of origin can best be determined by having knowledges and experience to recognize burn patterns or incident indicators. There are definite relationships between the ? An the fire cause.

Answer 45

Point of origin

Question 46

Narrow V patterns with sharp line of demarcation may indicated?

Answer 46

Flaming, rapid combustion

Question 47

A fire indicator that is usually found near the point of origin and may be a good indicator to help locate the point of origin?

Answer 47

Deep char

Question 48

The explosive breaking off of pieces of concrete during exposure to fire describes ?

Answer 48

Spalling

Question 49

V patterns may sissy I identifying the point of origin of a fire and are usually found on walls. To sits in locating V patterns, the investigators first observations should attempt to locate?

Answer 49

Ceiling damage

Question 50

The fire scene investigator should work ? In relationship to the fires travel or spread.

Answer 50

Backwards

Question 51

Relative depth of char usually indicates?

Answer 51

Length of time exposed to fire

Question 52

The closer to the point of origin, the ? The smoke line.

Answer 52

Lower

Question 53

The minimum temp to which a fuel in air must be heated in order to initiate or cause self sustained combustion independent of the heat source is known as?

Answer 53

Ignition temperature