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Fire Tech Online Spring 2019 BC > BC Quiz 6 > Flashcards

BC Quiz 6 Flashcards

1
Q
  1. Regarding the expansion of steel at fires, it is incorrect to state that?
    Select one:
    a. At 1000 degrees, a steel member will expand 9 ½” over a 100 foot length
    b. In hot, fast fires, failure temperatures are reached rapidly and lateral thrust is maximized
    c. The expansion rate increases as the temperature rises
    d. Over 1000 degrees, steel will start to soften and fail, depending on the load it carries
A

(Pg 30) (Lateral thrust is minimized)

The correct answer is: In hot, fast fires, failure temperatures are reached rapidly and lateral thrust is maximized

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2
Q 
02. At a construction site, when shoring up an excavation, diagonal columns known as \_\_\_\_\_, brace the entire structure.
Select one:
a. Rakers
b. Soldiers
c. Walers
d. Tiebacks
A

(Pg 31)

The correct answer is: Rakers

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3
Q 
04. Fires occurring involving steel metal deck roofs are indicated by a characteristic \_\_\_\_\_\_\_ wave of fire several feet deep advancing rapidly on the underside of the roof.
Select one:
a. Blue
b. Red
c. Yellow
d. Orange
A

(Pg 33)

The correct answer is: Blue

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4
Q
  1. The best way to control fires occurring involving steel metal deck roofs are indicated by a fire several feet deep advancing rapidly on the underside of the roof is?
    Select one:
    a. Roof ventilation
    b. Continuous application of water to the underside of the roof
    c. Ladder pipe or tower ladder stream on the top of the roof
A

(Pg 33)

The correct answer is: Roof ventilation

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5
Q
  1. Regarding the cooling of unprotected steel at fires, it is incorrect to state?
    Select one:
    a. Cool all steel within the reach of hose streams
    b. Keep the stream moving from one spot to another
    c. Special attention should be given to cooling girders
    d. It is important that the stream reach the steel
A

(Pg 34) (Special attention to cooling columns)

The correct answer is: Special attention should be given to cooling girders

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6
Q 
07. Concrete has very good strength in?
Select one:
a. Compression only
b. Compression and tension
c. Compression, tension and shear
d. Compression and shear
A

(Pg 35)

The correct answer is: Compression only

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7
Q 
08. For any unit of area, steel has \_\_\_\_times the compressive strength of concrete?
Select one:
a. 5
b. 10
c. 20
d. 15
A

(Pg 36)

The correct answer is: 15

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8
Q
  1. If steel reinforcing rods are protruding from a column, the IC should?
    Select one:
    a. Have a Safety Officer inspect the column
    b. Immediately evacuate the building
    c. Consider withdrawal
    d. Shore up the column
A

(Pg 36)

The correct answer is: Immediately evacuate the building

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9
Q
  1. In a cantilever beam, tension is on the?
    Select one:
    a. Top of the beam
    b. Bottom of the beam
A

(Pg 36)

The correct answer is: Top of the beam

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10
Q 
11. If a wall formwork collapses and it is necessary to retard the setting of the concrete, as much \_\_\_\_\_\_\_ as possible should be worked into it?
Select one:
a. Water
b. Dirt
c. Sand
d. Sugar
A

(Pg 38)

The correct answer is: Sugar

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11
Q 
12. At a floor formwork collapse where there may be post-tensioned cables or rods present, the post-tensioned cables or rods should?
Select one:
a. Not be cut
b. Cut with a power saw
c. Cut with a torch
d. Cut with bolt cutters
A

(Pg 38)

The correct answer is: Not be cut

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12
Q 
13. Signs of post-tensioned concrete construction include?
Select one or more:
a. Characteristic anchors
b. Coils of tendons
c. Protruding cables
A

(Pg 39)

The correct answers are: Protruding cables, Coils of tendons, Characteristic anchors

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13
Q
  1. Which point below is incorrect regarding operations with tensioned concrete?
    Select one:
    a. Tendons cannot be cut with bolt cutters
    b. All cutting into post-tensioned concrete is unsafe
    c. Tendons are cold drawn steel and fail at 1000 degrees
    d. Stranded cables signal tensioned concrete
A

(Pg 41 800 degrees)

The correct answer is: Tendons are cold drawn steel and fail at 1000 degrees

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14
Q
  1. When performing positive pressure ventilation with fans, it would be incorrect to?
    Select one:
    a. Use either a vertical or horizontal exhaust opening
    b. Open multiple windows to facilitate the operation
    c. Use only one opening to exhaust contaminants
    d. Ensure the cone of air completely covers the entrance opening to the building
A

(Pg 46)

The correct answer is: Open multiple windows to facilitate the operation

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15
Q 
16. Positive pressure ventilation is effective against winds up to \_\_\_\_\_ mph?
Select one:
a. 20
b. 25
c. 10
d. 15
A

(Pg 46)

The correct answer is: 25

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16
Q
  1. In high rise fires, the principal smoke moving mechanism is the thermal energy of the fire.
    Select one:
    a. Disagree?
    b. Agree
A

(Pg 47)

The correct answer is: Agree

17
Q 
18. When the atmospheric temperature is constantly decreasing as the building height increases, the condition is known as?
Select one:
a. Pause
b. Inversion
c. Lapse
d. Reversal
A

(Pg 48)

The correct answer is: Lapse

18
Q 
19. If the atmospheric temperature has a layer of air that is warmer than the air below as the building height increases, the condition is known as?
Select one:
a. Lapse
b. Pause
c. Reversal
d. Inversion
A

(Pg 48)

The correct answer is: Pause

19
Q 
20. If the atmospheric temperature has a layer of air that is warmer than the air below as the building height increases, the layer is known as the \_\_\_\_\_\_ layer?
Select one:
a. Inversion
b. Lapse
c. Reversal
d. Pause
A

(Pg 48)

The correct answer is: Inversion

20
Q
  1. Regarding the effect of wind on a building, it would be incorrect to state that?
    Select one:
    a. Wind exerts a suction on the leeward side of the building
    b. Closely spaced buildings can create a canyon effect where wind decreases in velocity
    c. Wind exerts a pressure on the windward side of the building
    d. Ground level observations of wind are not valid
A

(Pg 48 - Increases)

The correct answer is: Closely spaced buildings can create a canyon effect where wind decreases in velocity

21
Q 
22. Wind blowing against a building seems to split about \_\_\_\_\_ of the way up the building, the upper portion flows up and over the roof, the lower portion flows downward in a vortex next to the building?
Select one:
a. 2/3
b. 1/4
c. 1/3
d. 1/2
A

(Pg 48)

The correct answer is: 2/3

22
Q
  1. Regarding stack effect in high rise buildings, it is least correct to state that?
    Select one:
    a. Stack effect is also caused by fire
    b. The amount of stack effect is proportionate to the difference in temperature—inside versus outside the building
    c. Stack effect is most significant during the winter
    d. It is caused by the difference in temperature between the air inside the building and outside the building
A

(Pg 48)

The correct answer is: Stack effect is also caused by fire

23
Q
  1. In winter stack effect, air movement will flow from floors into the vertical shafts, stairways and elevators in the _____ portion of the building?
    Select one:
    a. Upper
    b. Lower
A

(Pg 49)

The correct answer is: Lower

24
Q 
25. In winter stack effect, at a point \_\_\_\_\_\_\_ the height of the building, the air movement / flow from floors into the vertical shafts, stairways and elevators is reduced to zero?
Select one:
a. 1/3 to 1/2
b. 1/2 to 2/3
c. 2/3 to 3/4
d. 1/4 to 1/ 2
A

(Pg 49)

The correct answer is: 1/3 to 1/2

25
Q
  1. In the summer, stack effect is reversed and the flow of air is downward.
    Select one:
    a. Disagree?
    b. Agree
A

(Pg 49)

The correct answer is: Agree

26
Q
  1. In a truss, it is correct to state that the?
    Select one:
    a. Bottom chord is in compression and top chord is in tension
    b. Top chord is in compression and bottom chord is in tension
A

(Pg 51)

The correct answer is: Top chord is in compression and bottom chord is in tension

27
Q 
28. Shape is important for?
Select one:
a. Compressive loads
b. Neither compressive or tension loads
c. Tension loads
d. Both compressive and tension loads
A

(Pg 51)

The correct answer is: Compressive loads

28
Q
  1. If the top chord in a truss fails, in terms of its load bearing capacity, it will respond just like a?
    Select one:
    a. Beam
    b. Column
A

(Pg 52)

The correct answer is: Column

29
Q
  1. Carbon monoxide has a flammability range of 12.5% to 74% and an ignition temperature of 1128 degrees.
    Select one:
    a. Disagree?
    b. Agree
A

(Pg 53)

The correct answer is: Agree

30
Q
  1. If cold drawn steel cables are driven into rock, anchored with epoxy, and tensioned to be used at a construction site as tiebacks, and they are exposed to fire, they should be cooled continuously from a safe distance.
    Select one:
    a. Disagree?
    b. Agree
A

(Pg 31)

The correct answer is: Agree

Fire Tech Online Spring 2019 BC (14 decks)

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