DUNN

Question 1

What is the weak link in the construction of fire resistive high rise buildings

Answer 1

Floors

Question 2

Spray fire retardant material needs 3 things to be effective

Answer 2

Adhesion
Consistency
Thickness

Question 3

Factors that will increase the number of burning building collapses

Answer 3

Age (buildings have a lifespan of 75-100 years)
Abandonment
Lightweight construction material
Faulty renovations

Question 4

Which part if the building is more likely to collapse and kill firefighters

Answer 4

Floors

Order according to Dunn
Floors
Roofs 
Walls
Ceilings

Question 5

The 7 primary structural members

Answer 5

Bearing walls
Columns
Girders
Headers
Hip rafters
Ridge poles
Trimmer floor beams

Question 6

Heat activated fire damper may stop the flame spread but does not

Answer 6

Stop the spread of smoke throughout the systems air ducts

Question 7

Experience has shown us that firefighters operating hose lines cannot extinguish fires in floor areas over

Answer 7

5000 SQ FT

Question 8

Most common type of masonry wall failure

Answer 8

Straight out at a 90 degree angle

Question 9

The most dangerous canopy is

Answer 9

Metal or wood shed suspended over a truck loading area, covered with tarpaper and thus extremely flammable

Question 10

What is more of a collapse danger? A canopy or a marquee

Answer 10

Canopy

Question 11

The most dangerous time for floor collapse occurs in what stage of the fire

Answer 11

Decay stage

After the fire has been extinguished

Question 12

When should you increase the collapse zone from the height of the building to 1 1/2 to 2 times the height of the building

Answer 12

Truss roof that may trigger the wall collapse
Explosion
Ordered by the IC

Question 13

The most dangerous area outside a burning building

Answer 13

Sidewalk in front of the building and it is even more dangerous if the building has a parapet wall

Question 14

The most dangerous parapet wall is

Answer 14

Front wall of a one story structure above several large display window

Question 15

The most deadly type of floor collapse

Answer 15

Multilevel floor collapse

Question 16

A multi level floor collapse most often happens in buildings that have

Answer 16

Columns and girders supporting the floors. A building with a frontage of 25 feet or more usually has columns and girders

Question 17

What is the safest sloping roof to walk on

Answer 17

Rafter constructed roof

Question 18

What is the largest unsupported roof deck

Answer 18

Truss roof

Next largest is the plank and beam roof

Question 19

The most common timber truss roof

Answer 19

Bowstring truss

Question 20

The most unstable parts of a house of worship

Answer 20

The tower and steeple

Question 21

Lightweight wood truss construction can fail in

Answer 21

5-10 minutes

Question 22

The failure temperature of steel

Answer 22

1,000 - 1,100 degrees

The fire service considers 1,100 to be the failure temperature

Question 23

The least effective way of protecting steel from fire

Answer 23

Spray on fire retarding material - SFRM

Also the most popular but least effective

Question 24

50 foot long beam heated uniformly over its length will increase

Answer 24

3 feet 9 inches

Question 25

Because of severe hazards associated with truss construction New York has a law requiring

Answer 25

2 vertical lines to identify truss construction

Question 26

The rate of fire spread in a buildings concealed spaces that utilize parallel chord lightweight truss will be

Answer 26

100% faster than in conventional solid wood construction

Question 27

The most dangerous ceiling is a

Answer 27

Suspended ceiling

Question 28

After a suspended ceiling collapse there is always

Answer 28

A rapid fire increase

Question 29

The ceiling collapse killing most NYC Firefighters is the

Answer 29

Wood grid suspended ceiling

Question 30

The most important 1st step to rescue trapped members under a collapsed ceiling during a store fire is to

Answer 30

Sweep the collapse area above the ceiling with a hose line and knock down the flames

Question 31

In most multi story buildings the stairway is the safest area in the wooden interior of the building and logically the best avenue for the initial fire attack

Answer 31

True

Question 32

The preferred stair in modern building construction is the

Answer 32

U-return

Question 33

Which type of stair will not fail if the floor collapses

Answer 33

U-return

Question 34

The most serious injury to members on steel framed u-return stairs occur when the

Answer 34

Intermediate stair landing collapses

Question 35

The most frequent cause of collapse in the steel u-return stair is the

Answer 35

Stone stair tread or step

Question 36

What is the safest type of fire escape

Answer 36

Exterior screened stairways

Question 37

The best way to remove numerous people from a fire escape is

Answer 37

Through the designated horizontal exit and into the adjoining apartment window or door

Question 38

The most dangerous type of wood frame building collapse

Answer 38

The inward-outward collapse It may involve the collapse of 2, 3 or 4 walls simultaneously. Only firefighters in the corner safe zones will survive the collapse. The corner safe areas are the 4 flanking zones around a burning wood frame building

Question 39

The 4 most widely used methods of wood framed construction

Answer 39

Braced frame Ballon Platform Lightweight wood frame

Question 40

Out of the 4 most widely used methods of wood frame construction which one is the most dangerous to firefighters

Answer 40

Braced frame

Question 41

What is the danger to firefighters during the early stages of fire in a building built using lightweight wood construction

Answer 41

Early floor and roof collapse of truss floors and roofs

Question 42

Wooden buildings located on a corner plot or standing alone are more susceptible to

Answer 42

Global collapse during fires than wood buildings in the center of a row. When a serious fire burns out the entire 1st floor of a 3 story wood building there is a danger of global collapse

Question 43

Concrete reaches its maximum strength after

Answer 43

27 days

Question 44

After how many hours does concrete floors have enough strength to enable the wood formwork below be removed and reconstructed above

Answer 44

48 hours

Question 45

Shanties are required to be non combustible and at least______ Feet from the building under construction and they cannot be grouped together

Answer 45

30 feet

Question 46

A party wall where roof beams from both sections are supported by the wall is not a true fire division. Collapse of the roof on one side could cause the party wall to collapse on the other side ( True or False)

Answer 46

True

Question 47

Applications of sprayed on fire retardant material (SFRM)over primer painted steel reduce its effectiveness by

Answer 47

1/3 to 1/2

Question 48

During what stage or stages of fire is the buildings structural framework most often affected by a fire

Answer 48

``` 2nd stage (fully developed stage) 3rd stage (decay stage) ```

Question 49

The most important strategy and tactical consideration at a fire is

Answer 49

Water supply and pressure

Question 50

What is the correct collapse danger of private dwellings

Answer 50

Collapse of 1st floor

Question 51

In a finished basement with a ceiling the ceiling barrier can give floor supports_____ or more minutes of fire protection

Answer 51

20 or more minutes

Question 52

Can SA battalion chiefs due theater inspections

Answer 52

Yes

Question 53

Hierarchy Of Collapse

Answer 53

1) Bearing Wall (most serious) 2) Column 3) Girder 4) Beams (floor or roof) 5) Deck (least serious)

Question 54

2 Types of ceilings

Answer 54

Directly affixed | Suspended

Question 55

3 Types of suspended ceilings

Answer 55

Wood Grid Metal Grid Lightweight Grid