OS Fire Fighting and Fire Prevention

Question 1

What three elements must be present simultaneously to sustain a fire (the fire triangle)?

Accepted Answer

Heat, fuel, and oxygen

Answer

The fire triangle consists of heat, fuel, and oxygen — removing any one of these three elements will extinguish or prevent a fire.

Question 2

Which class of fire specifically involves flammable liquids such as fuel oil, diesel, and paint?

Accepted Answer

Class B

Answer

Class B fires involve flammable and combustible liquids such as oil, diesel, gasoline, and paint — common hazards aboard ships.

Question 3

Which type of fire extinguisher should NEVER be used on an electrical fire?

Accepted Answer

Water extinguisher

Answer

Water conducts electricity, so using a water extinguisher on an energized electrical fire creates a serious risk of electrocution to the operator.

Question 4

What is the primary purpose of a fire damper installed in a ship's ventilation system?

Accepted Answer

To prevent fire and smoke from spreading through ventilation ducts

Answer

Fire dampers are designed to close automatically and isolate sections of the ventilation system, preventing fire and smoke from traveling to other compartments.

Question 5

What is the correct technique for an ordinary seaman advancing toward a fire with a hose?

Accepted Answer

Stay low, advance slowly while maintaining a water spray curtain

Answer

Advancing low reduces exposure to heat and toxic smoke, and a spray pattern provides protection and cools surrounding surfaces while approaching the fire.

OS - Ordinary Seaman Exam Practice Test

OS - Ordinary Seaman Exam Practice Test

OS Fire Fighting and Fire Prevention