S15 Practice test

High-expansion foam is most suitable for use on fires involving liquefied natural gas (LNG). Its high expansion ratio allows it to quickly cover large areas and provide vapor suppression, which is crucial for LNG fires.

A foam dam in a foam-water sprinkler system is used to contain and deepen foam blankets in specific areas. This helps to maintain an effective foam layer over flammable liquids, enhancing fire suppression capabilities.

The color of sprinkler heads does not affect the selection of foam concentrate. The main factors considered are fuel type (to ensure compatibility), water supply characteristics, and environmental impact of the foam.

The primary function of a foam generator in a foam-water sprinkler system is to mix air with the foam solution to create expanded foam. This process increases the volume and effectiveness of the foam for fire suppression.

In a deluge foam-water sprinkler system, only water is initially discharged until foam concentrate is manually or automatically injected into the system. This allows for flexibility in response to different types of fires.

The primary purpose of a foam chamber in a foam-water sprinkler system is to introduce foam into flammable liquid storage tanks. It allows for the application of foam to the surface of the liquid in case of a fire within the tank.

According to the color-coding standards for foam extinguishing systems, yellow is not typically used. The standard colors are red for foam concentrate lines, blue for water lines, and green for foam solution lines.

In a foam-water sprinkler system, the expansion ratio refers to the ratio of expanded foam to the original foam solution. It indicates how much the foam expands when discharged, which affects its ability to cover and suppress fires.

The primary advantage of a bladder tank in a foam-water sprinkler system is that it prevents the foam concentrate from coming into contact with air. This helps preserve the quality of the foam concentrate and extends its shelf life.

The proportioner is responsible for maintaining the correct proportion of foam concentrate to water in a foam-water sprinkler system. It ensures that the right amount of foam concentrate is mixed with water to create an effective firefighting solution.

According to NFPA 25, foam concentrate samples in storage tanks should be tested annually. This test ensures that the foam concentrate has not degraded and remains effective for fire suppression.

Alcohol-resistant Aqueous Film-Forming Foam (AR-AFFF) is most effective for suppressing fires involving polar solvents. It forms a protective membrane between the foam and the solvent, preventing foam breakdown.

The primary purpose of an inductor in a foam-water sprinkler system is to introduce foam concentrate into the water stream. It uses the venturi effect to draw the foam concentrate into the flowing water, creating the foam solution.

In a foam-water deluge system, the foam concentrate mixes with water at the proportioner. This device ensures the correct ratio of foam concentrate to water before the mixture is discharged through the open sprinkler heads.

Potassium Bicarbonate is not a foam concentrate solution used in foam-water sprinkler systems. The main types are Protein, Fluoroprotein, and AFFF. Potassium Bicarbonate is typically used in dry chemical fire extinguishing systems.