AB Firefighting and Emergency Procedures 3

Question 1

During a fire emergency, what is the primary purpose of boundary cooling?

Accepted Answer

To prevent fire from spreading to adjacent compartments

Answer

Boundary cooling involves applying water to bulkheads, decks, and doors surrounding a fire to prevent heat transfer and spread.

Question 2

What type of fire extinguisher should NEVER be used on a Class C (electrical) fire?

Accepted Answer

Water extinguisher

Answer

Water conducts electricity and can cause electrocution or equipment damage when used on energized electrical fires.

Question 3

When donning a Self-Contained Breathing Apparatus (SCBA), the facepiece seal must be checked by:

Accepted Answer

Performing a positive and negative pressure test

Answer

Positive and negative pressure seal checks confirm the facepiece is airtight before entering a hazardous atmosphere.

Question 4

Which agent is used in a foam fire extinguisher and works by forming a blanket over burning liquids?

Accepted Answer

Aqueous Film-Forming Foam (AFFF)

Answer

AFFF creates a film over liquid fuel surfaces that prevents vapors from escaping and reaching ignition sources.

Question 5

What is 'backdraft' in firefighting terminology?

Accepted Answer

A sudden explosive ignition when oxygen is introduced to a smoldering, oxygen-depleted fire

Answer

Backdraft occurs when a smoldering fire in an oxygen-starved space suddenly receives fresh air, causing rapid ignition or explosion.

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