BC Quiz 5

Question 1

01. The proper way to breach a masonry wall is to?
Select one:
a. Cut two lines parallel to the ground
b. Make cuts perpendicular to the ground
c. Open a triangular hole
d. Open a rectangular hole

Answer 1

(pg 9)

The correct answer is: Open a triangular hole

Question 2

2. If you are breaching a wall and find any evidence that a wall is strengthened at that point?
   Select one:
   a. Continue, you are in a good spot
   b. Stop and start somewhere else

Answer 2

(pg9)

The correct answer is: Stop and start somewhere else

Question 3

3. Regarding arches, it would be incorrect to state that?
   Select one:
   a. Bowstring truss roofs are arches
   b. The thrust of an arch is outward
   c. Arches are under compression their entire length
   d. The arch combines the function of a beam and column

Answer 3

(Pg 10) Bowstring truss roofs are not arches

The correct answer is: Bowstring truss roofs are arches

Question 4

4. The removal of any part of an arch can collapse the entire arch.
   Select one:
   a. D. Disagree
   b. Agree

Answer 4

(pg 10)

The correct answer is: Agree

Question 5

5. The type of construction that utilizes connections that are usually strong enough to reroute forces if a member is removed is known as a?
   Select one:
   a. “Pinned” building
   b. “Rigid-Framed” building

Answer 5

(pg 10)

The correct answer is: “Rigid-Framed” building

Question 6

06. Heavy timber is lumber that is \_\_\_\_\_\_ inches or more in its smallest dimension?
Select one:
a. 4
b. 10
c. 8
d. 6

Answer 6

(pg 13)

The correct answer is: 8

Question 7

07. At the floor line, a horizontal board called a ribbon board, is found in what kind of building?
Select one:
a. Post and frame
b. Platform construction
c. Balloon frame

Answer 7

(Pg 13)

The correct answer is: Balloon frame

Question 8

08. Which building has structural continuity from top to bottom?
Select one:
a. Post and frame
b. Platform construction
c. Balloon frame

Answer 8

(Pg 14)

The correct answer is: Balloon frame

Question 9

09. The maximum span of wood joists is about \_\_\_\_\_\_\_ feet?
Select one:
a. 25
b. 35
c. 20
d. 30

Answer 9

(Pg 17)

The correct answer is: 25

Question 10

10. Braced walls are a basic sign that a wall is in distress and are signaled on the outside of a building by?
    Select one or more:
    a. Spreaders
    b. Channel Sections
    c. Plates
    d. Stars
    e. Straps from the front wall to a side wall

Answer 10

(Pg 19)

The correct answers are: Stars, Plates, Channel Sections, Spreaders, Straps from the front wall to a side wall

Question 11

11. Bracing on the outside walls of a building is always an indication of instability.
Select one:
a. Agree
b. Disagree?
Feedback

Answer 11

(Pg 19)

The correct answer is: Disagree?

Question 12

12. Buildings that have walls tied to the floors to make the structure more rigid, generally can be identified on the outside by?
    Select one:
    a. Spreaders, usually stars, in a regular pattern
    b. Plates, in an irregular pattern
    c. Plates, in a regular pattern
    d. Spreaders, usually stars, in an irregular pattern

Answer 12

(Pg 19)

The correct answer is: Spreaders, usually stars, in a regular pattern

Question 13

13. Regarding cast iron columns, it is incorrect to state?
    Select one:
    a. Sometimes cast iron columns are held in place only by gravity
    b. Generally, cast iron columns pass through girders they support at their full width. The ends of the girders are cut into a semi-circle and rest on a cast iron flat shelf
    c. The chief cause of cast iron column failure is that sometimes they are poorly cast so thus the material is thin at one point
    d. Sometimes they are topped by a pintle — a solid iron pin of much smaller diameter than the column — and the pintle passes through the wooden girder it is supporting.

Answer 13

(Pg 21) (The chief cause of cast iron column failure is unsafe connections)
The correct answer is: The chief cause of cast iron column failure is that sometimes they are poorly cast so thus the material is thin at one point

Question 14

14. Carbon monoxide’s flammability range is?
Select one:
a. 12.5% to 54%
b. 12.5% to 74%
c. 5% to 74%
d. 5% to 15%

Answer 14

(Pg 22)

The correct answer is: 12.5% to 74%

Question 15

15. Carbon monoxides ignition temperature is?
Select one:
a. 1128 degress
b. 1054 degrees
c. 1242 degrees
d. 900 degrees

Answer 15

(Pg 22)

The correct answer is: 1128 degress

Question 16

16. Mill construction has which of the following characteristic(s)?
    Select one or more:
    a. Exterior bearing and non-bearing walls are masonry
    b. There are concealed spaces throughout
    c. Walls have scuppers and drains to drain off water
    d. Columns and beams are heavy timber
    e. The ends of girders are fire cut

Answer 16

(Pg 23) (There are no concealed spaces at all)
The correct answers are: Columns and beams are heavy timber, Exterior bearing and non-bearing walls are masonry, The ends of girders are fire cut, Walls have scuppers and drains to drain off water

Question 17

17. Radiant energy is proportional to the \_\_\_\_\_\_\_ power of absolute temperature?
Select one:
a. 3rd
b. 2nd
c. 5th
d. 4th

Answer 17

(Pg 27)

The correct answer is: 4th

Question 18

18. A 2000 degree fire lasting 20 minutes can have \_\_\_\_\_\_ times the radiant energy of a 1000 degree fire lasting 20 minutes?
Select one:
a. 32
b. 8
c. 16
d. 4

Answer 18

(Pg 27) (Double the temperature means 2 to the 4th power = 16 times more energy)
The correct answer is: 16

Question 19

19. Regarding the strength of steel, it is correct to state that it’s compressive strength is \_\_\_\_\_\_ its tensile strength?
Select one:
a. Equal to
b. Far greater than
c. Much less than

Answer 19

(Pg 29)

The correct answer is: Equal to

Question 20

20. Regarding the strength of steel, it is correct to state that its shear strength is \_\_\_\_\_\_ of its tensile strength?
Select one:
a. 1/2
b. 1/4
c. 3/4
d. 2/3

Answer 20

(Pg 29)

The correct answer is: 3/4

Question 21

21. Regarding steel, it is incorrect to state that?
    Select one:
    a. Structural steel fails around 1300 degrees
    b. Steel is a good conductor
    c. If steel cannot elongate because of restraint, it will buckle or overturn
    d. Cold drawn steel fails around 1000 degrees

Answer 21

(Pg 29) (800 degrees)

The correct answer is: Cold drawn steel fails around 1000 degrees

Question 22

22. If steel is elongating at a fire, placing water on it will?
    Select one:
    a. Cause it to buckle
    b. Draw it back to its original dimensions
    c. Cause failure of the steel
    d. Freeze the steel in whatever shape it is in

Answer 22

(Pg 29)

The correct answer is: Draw it back to its original dimensions

Question 23

23. If steel is failing at a fire, placing water on it will?
    Select one:
    a. Freeze the steel in whatever shape it is in
    b. Draw it back to its original dimensions
    c. Cause failure of the steel
    d. Cause it to buckle

Answer 23

(Pg 29)

The correct answer is: Freeze the steel in whatever shape it is in

Question 24

24. Smaller steel beams expand and contract \_\_\_\_\_\_ than larger beams?
Select one:
a. At the same rate
b. Slower
c. Quicker
d. Much slower

Answer 24

(Pg 30)

The correct answer is: Quicker

Question 25

25. Steel expands from 6%-7% in length for each \_\_\_\_\_degree rise in temperature?
Select one:
a. 100
b. 150
c. 50
d. 1000

Answer 25

(Pg 30)

The correct answer is: 100