NFST NFST Fire Behavior and Science

Question 1

What is the minimum oxygen concentration required to sustain flaming combustion?

Accepted Answer

16%

Answer

12%

Answer

21%

Answer

25%

Question 2

Which of the following best describes 'flashover' in a structure fire?

Accepted Answer

When all combustible surfaces in a room ignite nearly simultaneously

Answer

When the first window breaks from heat

Answer

When a backdraft explosion occurs

Answer

When a fire jumps from one building to another

Question 3

The three components of the fire triangle are fuel, heat, and which third element?

Accepted Answer

Oxygen

Answer

Carbon dioxide

Answer

Nitrogen

Answer

Hydrogen

Question 4

What type of heat transfer occurs when heat moves through direct contact between objects?

Accepted Answer

Conduction

Answer

Convection

Answer

Radiation

Answer

Combustion

Question 5

Which class of fire involves energized electrical equipment?

Accepted Answer

Class C

Answer

Class A

Answer

Class B

Answer

Class D

Question 6

Backdraft is most likely to occur when a fire in a closed compartment receives a sudden influx of what?

Accepted Answer

Oxygen

Answer

Water

Answer

Carbon dioxide

Answer

Foam