NEBOSH Fire Safety Management 2

Question 1

A CO2 fire extinguisher is identified by which colour band on a red body?

Accepted Answer

Black

Answer

A CO2 (carbon dioxide) extinguisher has a black colour band on a red body under BS EN 3. CO2 extinguishers work by displacing oxygen and are suitable for Class B (flammable liquid) and electrical fires. They leave no residue, making them ideal for use on sensitive equipment.

Question 2

Which class of fire involves flammable gases such as propane or butane?

Accepted Answer

Class C

Answer

Class C fires involve flammable gases including propane, butane, methane, and natural gas. The primary method of dealing with a Class C fire is to shut off the gas supply if safe to do so. Dry powder extinguishers can be used to control the flames, but the gas supply must be isolated to prevent re-ignition.

Question 3

How often should fire drills typically be conducted in a workplace under UK fire safety guidance?

Accepted Answer

At least once per year, with more frequent drills for high-risk premises

Answer

UK fire safety guidance recommends fire drills at least once per year in most workplaces, with higher-risk premises such as care homes, hospitals, and HMOs conducting them more frequently (e.g., every 6 months). Drills should be recorded and evaluated to identify weaknesses in the evacuation procedure.

Question 4

What is the main mechanism by which a foam extinguisher suppresses a Class B (liquid) fire?

Accepted Answer

Forming a film or blanket over the liquid surface to seal vapours from the oxygen supply

Answer

Foam extinguishers work primarily by forming a cohesive blanket or film over the surface of the burning liquid. This seals the flammable vapours from the oxygen in the atmosphere, smothering the fire. The aqueous component also provides some cooling effect on the fuel surface.

Question 5

What measures can be taken to prevent arson in the workplace?

Accepted Answer

Control access to the site, secure waste storage areas, improve lighting, remove external combustible materials, and install CCTV

Answer

Arson prevention measures include: controlling site access with fencing and gates, securing waste bins and skips away from buildings, installing external lighting and CCTV, removing combustible materials from building perimeters, securing letterboxes, and ensuring vacant areas are properly secured. Arson is the single largest cause of fires in non-domestic premises in the UK.

NEBOSH IGC Practice Test

NEBOSH IGC Practice Test

NEBOSH Fire Safety Management 2