Chapter 10

Question 1

Steel starts to distort and lose strength when flames reach _ degrees Fahrenheit?

a. 800-900
b. 1000-1100
c. 900-1000
d. 1100-1200

Answer 1

B The correct answer is: 1000-1100

Question 2

Critical failure temperature of steel depends on

a. The heat of the fire
b. The dimension of the steel
c. The fire protection covering over the steel surface
d. The span of the steel beam
e. The load the steel carries

Answer 2

A-E

Question 3

Best method of protecting steel from a FF’s point of view

a. Spray on Fire Retarding Material (SFRM)
b. Concrete encasement
c. EFIS systems
d. Membrane ceilings

Answer 3

B

Question 4

Applications of Spray on Fire Retarding Material (SFRM) over primer paint reduce adhesion of SFRM effectiveness

a. 100%
b. ¼ to ½
c. ½ to ¾
d. 1/3 to ½

Answer 4

D

Question 5

Fire Service considers _ degrees to be the failure temperature of steel, because at that temperature, steel will lose _ % of its load carrying ability?

a. 1100, 50
b. 1100, 40
c. 1000, 50
d. 1000, 40

Answer 5

B 1100, 40

Question 6

Causes of failure of steel correct

a. Large area fires involving large amts of a steel beam will heat a steel beam to its critical temperature more quickly
b. Because steel is a good conductor of heat, when the surrounding flame or heat reaches 1100 degrees, the steel will simultaneously reach that temperature
c. Large size steel and lightweight steel structural supports have large amounts of heat sink capacity
d. The heat sink property of steel lengthens the time it takes for steel to reach its collapse temperature.
e. The greater the supported load, the faster a steel structural member will fail

Answer 6

A D E