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Cpt Exam 23 > Truck > Flashcards

Truck Flashcards

1
Q

Ventilation definition:

A

“systematic” removal of heat, smoke, and fire gases from a structure, replacing it with cooler, clean, fresh air

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2
Q

Effective ventilation will accomplish four main objectives:

A
  • save lives
  • assist in firefighter access
  • control the horizontal spread of fire
  • reduce the possibility of flashover/backdraft
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3
Q

Two methods of horizontal ventilation:

A
  • natural
  • positive pressure
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4
Q

What is the key to effective roof ventilation?

A

knowledge of rafter type and rafter direction

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5
Q

When operating on a lightweight truss roof, or suspected lightweight truss roof, the ventilation team shall never:

A

conduct ventilation directly over the fire

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6
Q

Two types of ventilation holes:

A
  • heat hole (offensive)
  • strip (defensive)
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7
Q

What must occur with strip ventilation?

A

A heat hole

Heat hole must be cut first to slow the horizontal spread of the fire

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8
Q

A head cut must be performed on roofs covered with?

A

plywood and diagonal sheathing

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9
Q

Kerf cut definition:

A

single cut made through the roof decking, the same width as the saw blade. Not as effective but can be used as an alternative to using a smoke indicator hole

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10
Q

Plug cut definition:

A

triangular piece of roof comp removed to expose the sheathing, used to determine sheathing type and roof composition thickness

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11
Q

Skim cut definition:

Used when?

A

light cut through covering and plywood sheathing, skim the top of the rafters, used on panelized roofs when you louver off a purlin

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12
Q

Smoke indicator hole definition:

A

triangle cut through sheathing and roof material, indicator smoke/fire conditions, should be placed along the path of access/egress every few yards

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13
Q

45 degree inspection cut definition:

A

used to determine rafter type/direction, will also tell you sheathing type, thickness of roof comp, and act as smoke indicator

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14
Q

Saw operator should cut a min of ___ dice cuts prior to the puller removing sheathing

A

3

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15
Q

Always leave a min of ___ un pulled section between the cutter and the puller? (when dicing)

A

1

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16
Q

Panelized roof cutting techniques and mode of operation:

A
  • drop method (offensive)
  • pull back method (offensive)
  • offensive louver (offensive)
  • louver off lam/main beam (defensive)
  • louver off purlin (defensive)
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17
Q

Book 29-
size up consists of 3 operations:

A
  • analyze situation
  • decide on plan (strategy)
  • put plan into operation (tactics)
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18
Q

Conducting a building size up, focus on:

A
  • construction style
  • roof style
  • construction method
  • age of building
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19
Q

Ability to accurately estimate the amount of time that a structure can be considered structurally strong is dependent on:

A
  • type of construction
  • how long the fire has been building
  • fire intensity
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20
Q

Gable roof, strength/hazards:

A

strengths: ridge and exterior walls

haz: trusses w/ metal gusset plates = short burn time and potential failure/collapse

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21
Q

T/F

Plywood will burn/fail at a faster rate than sheathing

A

True, plywood offers minimal resistance to fire

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22
Q

Hip roof, strengths/hazards:

A

strengths: ridge, valley, hip, and exterior walls are areas of strength

haz: if covered w/ tile, will need to be removed prior to cutting

23
Q

Bridge truss, strengths/hazards:

A

strengths: well constructed, easily identifiable by its sloping ends

haz: strength is dependent on size of lumber and span of trusses. underside is usually common to interior of commercial warehouse

24
Q

Bridge truss roofs usually found on:

A

commercial buildings constructed between 30s-40s. usually heavy grade construction

25
Q

Straight sheathing usually used prior to ___, diagonal sheathing utilized after

A

1933

26
Q

Bowstring arch roofs usually found on:

A

both small and large commercial structures, popular during 30s, 40s, 50s

27
Q

Bowstring arch, strengths/hazards:

A

strengths: usually well constructed

haz: underside is usually common to the interior of commercial warehouse, usually fails in sections

28
Q

Lamella arch roofs common on:

A

gymnasiums, large buildings used for rec. activities, supermarkets, etc

29
Q

Lamella, strengths/hazards:

A

strengths: solidly built

haz: total collapse may occur if fire removes more than 20% of roof structure

30
Q

Tied truss arch roofs use:

A

metal tie rods to offer lateral support for the exterior walls

tie rods used below each arch member

31
Q

Tied truss arch, strengths/hazards:

A

strengths: utilized large size lumber

haz: early failure of metal tied rods

32
Q

Sawtooth roofs used on:

A

commercial building to yield more light and ventilation

constructed same today as it was in the 30s/40s

33
Q

Sawtooth strengths/hazards:

A

strengths: well constructed, easy to ventilate

haz: underside is open and exposed to the structure

34
Q

Difference between conventional flat roof and lightweight flat roof:

A

similar in design, rafters replaced w/ lightweight construction

35
Q

Conventional flat roof, strengths/hazards:

A

strength: perimeter of the building. susceptibility to fire is dependent on size of rafters

haz: determined by rafter size/span/spacing, presence of metal hangers

36
Q

Newer conventional flat roofs will be covered with ___ instead of ___

A

plywood instead of sheathing

37
Q

Wooden I beam roof, strengths/hazards:

A

strength: perimeter of the building

haz: little time for the 3/8 inch stem to burn, weaken, cause collapse. expect rapid failure when exposed to fire

38
Q

Open web roof, strengths/hazards:

A

strength: exterior of the building

haz: truss chords will take little time to burn/weaken/fail, expect rapid failure

39
Q

Metal gusset plate roof, strengths/hazards:

A

strength: where trusses cross/terminate on outside bearing walls

haz: little time to burn/weaken/collapse, rapid and total collapse is common

40
Q

Panelized roof, 4 major components:

A
  • beams
  • purlins
  • 2x4 joists (rafters)
  • 2 inch plywood decking
41
Q

Panelized roof, strengths/hazards:

A

strengths: beams, purlins, perimeter

haz: weakening and/or collapse with failure of large portions of the roof under heavy fire conditions

42
Q

Open web bar joist roof, strengths/hazards:

A

strengths: perimeter

haz: metal exposed to fire/heat (loses strength at 1000 deg.) will expand, twist and probably fail

43
Q

Lightweight concrete roof are utilized when?

A

additional insulate properties are desired (next to airports/freeways)

44
Q

Lightweight concrete roof strength/hazard:

A

strength: structurally sound, resistive to fire

haz: difficult to penetrate w/ chain saw

45
Q

What type of roof construction should you expect to see on a concrete tilt up?

A

lightweight

46
Q

Indications of a pre 33, unreinforced masonry:

A
  • sand/lime mortar
  • rafter tie plates
  • king row
  • inset windows
47
Q

What event led to post 33 construction?

A

LB earthquake

48
Q

What event led to post 59 construction?

A

Tehachapi earthquake

49
Q

What event led to post 71 construction?

A

Sylmar earthquake

50
Q

Unreinforced masonry floor and roof joists were originally designed to:

A

pull out from the walls during a fire, preventing wall collapse

51
Q

What is a facade?

A

“external attics”

usually open or common to the attic space

52
Q

What do rafter tie plates indicate?

A

location of roof rafters and identify the roof line

53
Q

Ballon construction hazard?

A

vertical spread of fire in the walls up to the above floors/attic space due to the absence of horizontal fire stops

Cpt Exam 23 (16 decks)

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