Hotel Service Unit 15 Q3 Quiz

Correct Answer:
C) The lowest temperature at which it emits vapors that can ignite with an external flame

Explanation:
Flash point is the temperature at which a substance releases enough vapors to form an ignitable mixture near its surface. An external ignition source, like a flame, is needed to start combustion.

Correct Answer:
B) Within 2 minutes

Explanation:
For rapid fire suppression, CO₂ discharge should quickly reach the required concentration, typically within 2 minutes, to effectively control and extinguish the fire in a machinery space.

Correct Answer:
D) The lowest temperature where sustained combustion begins with an external ignition source

Explanation:
The ignition point (or fire point) is slightly higher than the flash point and represents the temperature at which combustion can be sustained when an ignition source is present.

Correct Answer:
A) The lowest temperature at which it ignites without any external flame or spark

Explanation:
The auto-ignition temperature is the point where a material can ignite spontaneously due to heat alone, without an external ignition source.

Correct Answer:
B) Enough to achieve 40% concentration in the space

Explanation:
A concentration of approximately 40% CO₂ in the space is required to effectively displace oxygen and extinguish the fire in machinery spaces, ensuring that combustion cannot continue.