Unit 8: Myths and Legends

Question 1

What must be taken into account with char formation?

Answer 1

You must take into account the

type of material,

intensity of the fire,

ventilation, and

location of the fuel
package.

Question 2

• Char depth is related to___________rather than time.
• Severity of damage increases with length
of exposure

Answer 2

Heat flux and ventilation

Question 3

Aggregate liberating from concrete —
contraction and expansion.
•   Can be caused by 
intensive heat 
transfer and by 
sudden cooling.

Answer 3

Spalling of Concrete

Spalling is the 
fracturing of concrete 
or brick surfaces as a 
result of exposure to 
thermal or mechanical 
stress.

Question 4

Inverted V patterns may be

caused

Answer 4

fires of short duration

fires involving fuels that have low heat release rates

Question 5

Crazing or spidering of glass is the
internal shattering into
small, irregular areas
caused by the ___________

Answer 5

sudden cooling of hot glass.

Question 6

• Thermal fracture: Edges are
• Mechanical break: Edges will
• Conchoidal fractures.

Answer 6

almost mirror-smooth with no rib markings.

indicate rib markings on the cross section.

Question 7

After the power is removed from
the structure, there is no “residual
electricity” in the wires.

Answer 7

.

Question 8

Based on the type and quantity of
combustible materials in vehicles
manufactured today, total burnout is not
uncommon with any fire.

Answer 8

.