Ch. 14 Mission of Exposure

Question 1

Exposure protection involves the _______ part of the extinguishment process - ________ the fire.

Answer 1

First.

Confining.

Question 2

___________ is to prevent the spread of and ____________ in the assigned area.

Answer 2

Mission of exposure.

Extinguish any fire.

Question 3

Heat transferred from one molecule to another as molecules come in direct contact with each other

Answer 3

Conduction

Question 4

______________: Flame of burning object comes in contact with another object - most significant in _______ fires.

Answer 4

Direct flame impingement:

-Incipient

Question 5

Transfer of heat in the form of electromagnetic waves that travel in straight lines from the source of the fire.

Answer 5

Radiation

Question 6

Moves through a circulating medium

Answer 6

Convection

Question 7

This method is responsible for most of the fire spread inside a structure

Answer 7

Convection

Question 8

Two types of exposure

Answer 8

Interior and exterior

Question 9

Two basic forms of interior exposure

Answer 9

Horizontal and vertical

Question 10

This form of interior exposure is cause mostly by radiation and direct flame impingement

Answer 10

Horizontal interior exposures

room to room

Question 11

This interior exposure caused by convection currents

Answer 11

Vertical interior exposures

floor to floor

Question 12

Items of value outside the structure or area of origin that could be threatened by fire.
Are normally, but not exclusively, other structures.

Answer 12

Exterior exposures

Question 13

Plants and shrubs.
Toys.
Bikes.
Fencing.

Answer 13

Questionable exposures

Question 14

Extinguishment process has three components

Answer 14

Confine (nozzle in between).
Control (cooling gases).
Extinguish (overhaul).

Question 14

Need for protecting exposures depends on (3)

Answer 14

Number of BTUs being produced.
Ignition TEMPERATURE of exposed material.
DISTANCE the material is from the heat source.

Question 16

Interior exposures are mostly affected by _______ heat, although ______ heat will ignite materials in an area more horizontal.

This indicates interior exposure fire tend to spread _______ rather than ________.

Answer 16

Convected
Radiant

Upward.
Horizontally.

Question 17

To protect horizontal interior exposures, locate the seat of the fire and ________________.

Answer 17

Place a hose stream between the fire and its expected avenue of spread

close the door to involved room. Most home doors rated for 20 min

Question 18

To protect vertical interior exposures, locate the source of heat and _________________________.

Answer 18

Stop or check the spread of heat by convection currents.

• straight stream off ceiling.
• MANDATORY to get above fire as soon as knocked down.

Question 19

Two big errors with crews assigned to exposure

Answer 19

First, directing stream predominantly onto original fire, neglecting exposure.
Second, MOST COMMON error is not starting with large enough line. Line LARGER than 1 3/4 in.
2 1/2 in. should be FIRST line pulled

Question 20

Exposure line may have to be moved back so that an effective stream can cool the _____ in the same manner as the exterior side walls

Answer 20

Roof

Question 21

No doubt what INTERIOR exposures deserve your attention first, ______ currents will demand that you check extensions to the ______ exposures first.

Answer 21

Convection.

Upper.

Question 22

Exterior exposure factors (5)

Answer 22

Availability of add'l companies.
Wind direction.
Wind speed.
Proximity of exposed buildings.
Life safety

Question 23

Exterior exposure factors.

Probably as big of an influence as any:

Answer 23

Wind (direction).

• directs course of INTERIOR fire spread*
• choose exposure on LEE side*

Question 24

Exterior exposure factors.

Direct correlation between this and effect on exposures:

Answer 24

Wind SPEED.

More force, more spread

Question 24

Exposures.

Things for first-in officer to consider:

Answer 24

Proximity of bldgs=closest bldg first.
Life safety=greatest number of people.
Economic value=structure of most value.
Occupancy type=judgement call.

Question 25

Getting line between source and exposed building is first step in exposure protection.
To TOTALLY ensure fire will not attack the exposure, you need to get inside and make sure of TWO things:

Answer 25

Fire has not entered structure.

Make sure water and smoke are not entering exposed building.

Question 26

Water spray absorbs only about ________ of the radiant heat produced by a fire.

Answer 26

15%

Question 27

Glass will stop only about ______ of the radiant heat being produced by a fire.

Answer 27

15%

Question 28

After line put in place to protect exposure, officer should send ________ member(s) of crew into structure to check for: __________.

Answer 28

At least one.
Fire, smoke, and water damage.
-window can’t be closed, may have to place hoseline in window to cool.
EXTREMELY important to get into attic/cockloft and RECHECK OFTEN

Question 29

Size of line taken into exposure should be commensurate with: (3)

Answer 29

Amount of heat.
Proximity of exposure.
Efforts outside on the side of the SOURCE fire.

Question 30

Exposure group has a unique problem in that he could _____________________.

Answer 30

Become command for his own structure

Question 31

Exposure building and/or group.

This type of incident presents an excellent opportunity for ____________.

Answer 31

Observing members who are on the promotion list for chief officer or captain.
-own radio channel.

Question 32

Command should choose exposure officer wisely:

Answer 32

Experience and trust are the keys.

Question 33

3 responsibilities of exposure officer

Answer 33

Safety of crew.
Protecting assigned exposure (application of hose stream/gaining entry).
Keeping command informed.

Question 34

Safety of crew.
If exposure becomes significant, ________________ while _____________. Officer must choose the _________ to remain outside with the hoseline.

Answer 34

One crew member should remain to operate line.
Officer and crew member go to check inside of exposed bldg.

Best qualified firefighter