Fire Inspection & Code Enforcement Study Quiz 10

A stored-pressure water extinguisher would be chosen to attack a Class A fire. Class A fires involve ordinary combustible materials such as wood, paper, and cloth. Water is an effective agent for extinguishing these types of fires as it cools the fuel and removes the heat necessary for combustion. Stored-pressure water extinguishers are designed to discharge a stream of water onto the fire, helping to suppress and extinguish it. They are commonly used in residential and commercial settings where Class A fires are more likely to occur.

Contamination refers to the condition of impurity that occurs when a substance is mixed with or comes into contact with a foreign or unwanted substance. It implies that the substance has been polluted or tainted by the presence of something undesirable. In the context of the given options, creosote, decay, and smolder do not specifically imply the presence of impurity or foreign substance, whereas contamination directly relates to the condition described.

Class B fires involve fuels such as greases or flammable/combustible liquids. This means that fires caused by these substances fall under Class B category. Class B fires are typically fueled by substances that are flammable or combustible in nature, such as greases or liquids that can easily catch fire. These fuels can pose a significant fire hazard and require specific methods and extinguishing agents to be effectively controlled and extinguished.

The objective of a residential inspection program is to attain proper life safety conditions, prevent fires, and educate the property owner and occupants about fire safety. By achieving these goals, the program aims to ensure the safety and well-being of residents in residential buildings.

Heat of decomposition refers to the release of heat that occurs when a compound breaks down into simpler substances. This process is often caused by the action of bacteria, which break down organic matter and release heat as a byproduct. Therefore, the release of heat usually due to bacterial action aligns with the definition of heat of decomposition.

Doors act as a barrier to fire and smoke, preventing their spread and protecting people from harm. They also serve as components in a means of egress, providing a safe exit route for people during emergencies.

Fire spread through a ventilation duct system is generally controlled by fire dampers. Fire dampers are devices installed within the ductwork that automatically close when they detect the presence of fire or smoke. By closing off the duct, fire dampers prevent the spread of fire and smoke to other areas of the building. This helps to contain the fire and protect occupants by limiting the damage and allowing for safe evacuation. Fire dampers are an essential component of fire protection systems in buildings with ventilation systems.

According to NFPA 101, buildings used to display and sell merchandise are classified as mercantile occupancy. This classification is used for buildings that are primarily engaged in the retail sale of goods. It includes stores, markets, and other rooms or structures where merchandise is displayed and sold. This classification helps to ensure that these buildings meet specific safety requirements to protect occupants and prevent fire hazards associated with the storage and sale of merchandise.

The purpose of school fire exit drills is to ensure that all personnel are able to exit the building in an organized and controlled manner. This helps to prevent chaos and panic during an emergency situation and ensures that everyone can safely evacuate the premises. By practicing these drills, individuals become familiar with the evacuation procedures and know how to exit the building efficiently. This also allows for any issues with exits, such as locked doors, to be identified and addressed beforehand, further ensuring the safety of everyone involved.

The term L.E.L. stands for Lower Explosive Limit when referring to the L.E.L. of a flammable or combustible liquid. The Lower Explosive Limit is the minimum concentration of vapor in air that can ignite and sustain combustion. Below this limit, the mixture is too lean to burn. The L.E.L. is an important safety consideration as it helps determine the potential for a liquid to explode or catch fire in certain conditions.

The Law of Heat Transfer states that heat flows from a hotter object to a colder object until both objects reach the same temperature. This is because heat is a form of energy that naturally seeks to distribute itself evenly. Therefore, the colder body will absorb heat from the hotter body until equilibrium is reached. This law is a fundamental principle in physics that explains the transfer of thermal energy between objects.

During an inspection of a building, it is important to start with the exterior area. This is because the exterior of a building is exposed to various elements such as weather conditions, pests, and structural issues. Inspecting the exterior first allows for identification of any visible damages, cracks, or signs of wear and tear. It also helps in assessing the overall condition of the building, including its foundation, walls, windows, doors, and any potential safety hazards. By starting with the exterior, inspectors can gather important information about the building and prioritize their inspection process accordingly.

Friction loss refers to the pressure that is lost while water is being forced through various components such as pipes, fittings, fire hoses, and adapters. This loss of pressure occurs due to the friction between the water and the inner surfaces of these components. It is an important factor to consider when designing water distribution systems, as it affects the overall efficiency and effectiveness of the system.

The correct answer is "external supply system" because this classification is not commonly used for sprinkler systems. Wet pipe systems, dry pipe systems, and deluge systems are all commonly used classifications for sprinkler systems. Wet pipe systems have water constantly in the pipes and are the most common type of sprinkler system. Dry pipe systems are filled with pressurized air or nitrogen and are used in areas where freezing temperatures may occur. Deluge systems have open sprinkler heads and are used in areas where rapid fire spread is a concern. On the other hand, external supply systems are not commonly used for sprinkler systems and therefore do not fall under the common classifications.

Class C fire extinguishers are designed specifically for use on energized electrical equipment. They contain non-conductive extinguishing agents that can safely extinguish fires involving electrical equipment without the risk of electrical shock. Class A extinguishers are suitable for ordinary combustible materials, Class B extinguishers are for flammable liquids and gases, and Class D extinguishers are for combustible metals. Therefore, Class C extinguishers are the best choice for protecting energized electrical equipment and the surrounding area.

The preferred method of applying a portable extinguishing agent to a fire is to direct the stream at the base of the fire using a sweeping motion. This is because aiming at the base of the fire helps to cut off the fuel supply and disrupt the combustion process. By using a sweeping motion, the extinguishing agent can cover a larger area and ensure that all parts of the fire are reached. This method is effective in quickly extinguishing the fire and preventing it from spreading further.

A plot plan is a sketch that shows the overall layout of a property in relation to streets, neighboring properties, and other significant features. It provides a visual representation of how the property is situated within its surroundings and helps in understanding its orientation and boundaries. Unlike a floor plan or a sectional view, which focus on the internal layout and structure of a building, a plot plan provides a broader perspective of the property's location and context. A blueprint, on the other hand, refers to the detailed technical drawings of a building or structure.

Heat of friction refers to the heat energy generated when two objects in contact with each other move relative to each other, creating friction. Friction is the resistance encountered when two surfaces slide or rub against each other. As the objects move, the friction between them converts mechanical energy into heat energy. This heat energy is referred to as the heat of friction. It is important to note that the other options mentioned in the question, such as dielectric heating, static electricity, and resistance heating, do not specifically involve the movement between objects in contact, making them incorrect answers.

The correct answer is "outside screw and yoke valve". This valve is called an OS&Y valve because it has an outside screw mechanism for opening and closing the valve, and a yoke that connects the screw to the valve stem. This design allows for easy and visible operation of the valve, making it suitable for applications where regular maintenance and inspection are required.

The correct answer is convection, conduction, and radiation. These are the three main methods of heat transfer. Convection refers to the transfer of heat through the movement of fluids or gases. Conduction is the transfer of heat through direct contact between objects. Radiation is the transfer of heat through electromagnetic waves, such as from the sun.

A riser is a vertical pipe that supplies the sprinkler system. It is called a riser because it rises vertically from the main water supply line to the sprinkler heads. This vertical orientation allows the water to flow upwards and distribute evenly to the sprinkler heads, ensuring effective coverage of the area being irrigated.

Energy is the correct answer because it is the capacity to perform work. It can be transferred or converted from one form to another, such as from heat to mechanical energy or from chemical energy to electrical energy. In this context, energy can be applied to an object over a distance to do work, or it can be involved in a transformation of a substance. Therefore, energy fits the given description of being able to perform work when a force is applied or a transformation is made.

The flash point is the lowest temperature at which a fuel can vaporize and ignite when exposed to an open flame or spark. It is the temperature at which the fuel gives off enough vapors to create a momentary flash or fire. Once the flash point is reached, the fuel can sustain combustion. Therefore, when a fuel reaches its flash point, it has reached the temperature at which it can be ignited and burn momentarily.

In this question, the occupant load is calculated by dividing the total area of the assembly area (150 feet by 200 feet) by the load factor of 15 square feet per person. The calculation would be (150 ft x 200 ft) / 15 sq. ft per person = 2,000 people. Therefore, the correct answer is 2,000.

Fires involving flammable liquids, greases, and gases are classified as Class B fires. Class B fires involve flammable or combustible liquids, such as gasoline, oil, or alcohol, as well as flammable gases like propane or butane. These fires can be extinguished using fire extinguishers specifically designed for Class B fires, such as foam or carbon dioxide extinguishers.

Heat flows from a hot substance to a cold substance due to the difference in temperature between the two substances. This is known as the principle of thermal equilibrium, where heat naturally moves from areas of higher temperature to areas of lower temperature in order to reach a state of balance.

A stop or cock valve could not be used as a control valve for an automatic sprinkler system because it is a manual valve that requires human intervention to open or close. In an automatic sprinkler system, the control valve needs to be able to open and close automatically based on the system's requirements, such as water pressure or the activation of fire detection devices. Therefore, a stop or cock valve would not be suitable for this purpose.

Dry pipe sprinkler systems should be used in buildings where insufficient heat is maintained because these systems are designed to prevent the water from freezing in the pipes. In buildings where the temperature can drop below freezing, such as unheated warehouses or parking garages, using a wet pipe system could lead to the water freezing and causing the pipes to burst. Dry pipe systems use pressurized air or nitrogen to hold back the water until a sprinkler head is activated, allowing the water to flow and extinguish the fire. This prevents the pipes from freezing and ensures the system's effectiveness in cold environments.

The maximum travel distance to fire extinguishers for Class A hazards is 75 feet. This means that in an area with Class A hazards, the farthest a person should have to travel to reach a fire extinguisher should not exceed 75 feet. This ensures that fire extinguishers are easily accessible and can be quickly reached in case of a fire emergency.

Fire inspectors may want to acquaint fire suppression forces with proposed building plans so they can provide feedback about problems that may be encountered during a fire. This is important because fire suppression forces need to be aware of any potential challenges or hazards in the building that could affect their ability to effectively respond to and extinguish a fire. By sharing this information, fire inspectors can help ensure that fire suppression forces are prepared and equipped to handle any difficulties they may encounter during a fire incident.

When an individual building or business owner disagrees with the local jurisdiction's code interpretation or decision, they can seek a review by the Board of Appeals. This board is responsible for reviewing and deciding on appeals related to code interpretations and decisions made by the local jurisdiction. It provides an avenue for individuals to challenge and potentially overturn the initial decision. The other options mentioned in the question, such as a hearing in court or review by a civilian review board, may also be possible in certain cases but are not specifically mentioned as the correct answer.

According to NFPA 101, Life Safety Code, a building that provides sleeping facilities for 4 or more residents and is occupied by persons who are generally prevented from protecting themselves because of security measures not under their control is classified as a detention and correctional occupancy. This classification is used for facilities such as prisons, jails, and detention centers where the occupants are restricted and require special security measures for their safety.

An indicating type valve is the correct answer because it provides a visible indication of whether the valve is open or closed. This is important for a control valve in a sprinkler system as it allows for easy monitoring and ensures that the valve is functioning properly. It helps in quickly identifying any issues or malfunctions with the valve, allowing for prompt maintenance or repairs.

When the threads of an OS&Y (Outside Screw and Yoke) valve are extended, it means that the stem of the valve is fully visible and protruding from the valve body. This indicates that the valve is in the open position, allowing the flow of fluid or gas through the valve.

Water extinguishes fire by reducing the temperature of the fuel and the surrounding area. When water is applied to a fire, it absorbs heat from the flames, causing the temperature to decrease. This decrease in temperature prevents the fire from sustaining itself and eventually leads to its extinguishment.

Carbon dioxide fixed fire extinguishing systems are similar to halon systems in that they are primarily used to protect against fires involving flammable gases or liquids and in electrical equipment. Carbon dioxide is an effective fire suppressant as it displaces oxygen, thereby suffocating the fire. It is commonly used in areas where water or foam extinguishers may cause damage, such as computer rooms, laboratories, or electrical substations. These systems are typically activated automatically and release a high concentration of carbon dioxide to quickly extinguish the fire.

Normal operating pressure refers to the pressure that is typically present in a water distribution system during periods of normal consumption demand. This pressure is necessary to ensure that water is delivered to consumers at an adequate flow rate and pressure. It is different from residual pressure, which is the pressure that remains in the system after water flow has stopped. Atmospheric pressure refers to the pressure exerted by the atmosphere, and grid pressure refers to the pressure within the electrical grid.

In a courtroom procedure, it is not suggested to attempt to answer a question you do not know. It is important to be honest and truthful while providing testimony, and if you do not know the answer to a question, it is better to admit it rather than providing false information. Providing false or incorrect information can undermine your credibility as a witness and can have negative consequences for the case. It is always better to be honest and stick to the facts that you are sure about.

During a field observation of a site for emergency access, verification of code compliance for the storage, handling, and use of hazardous materials would not be considered. This is because the focus of the observation is on factors such as fire department access roadways, physical obstructions, turning radius, and building access distance requirements. The storage, handling, and use of hazardous materials is a separate concern that would be addressed through other inspections or assessments.

When there is a higher than normal concentration of oxygen present, it provides more oxygen molecules for the fire to react with. This increased availability of oxygen allows for more efficient combustion, resulting in a faster burning rate.

The final stage of fire development is decay. This stage occurs when the fire starts to run out of fuel and oxygen, causing it to weaken and eventually extinguish. During this stage, the fire's flames and heat diminish, and it becomes less dangerous. The decay stage is characterized by smoldering embers and a decrease in smoke production.

To perform a main drain test on a wet pipe sprinkler system, the first step is to observe and record the pressure on the gauge(s) at the system riser (Step 3). This provides a baseline pressure reading. The next step is to fully open the two-inch main drain and observe and record the pressure drop (Step 1). This step helps to determine if there are any obstructions or issues with the system. Finally, the two-inch main drain should be closed and the readings compared to the previously recorded readings (Step 2). This step helps to ensure that the system is functioning properly and that there are no leaks or abnormalities.

Containers that are approved for flammable and combustible liquids should have one or more devices that will provide sufficient venting capacity to limit the internal pressure of the containers. This is important to prevent the containers from bursting or exploding due to excessive pressure buildup. Having one or more venting devices ensures that there is adequate release of pressure to maintain the safety of the container and its contents.

Organic substances have the ability to undergo spontaneous heating due to their composition and chemical properties. This is because organic materials contain carbon-based compounds that can undergo exothermic reactions, such as oxidation, which can generate heat. In contrast, inorganic substances do not typically have the same ability to undergo spontaneous heating. Insulation and exposure to sunlight are not necessary conditions for spontaneous heating to occur in organic substances.

The main control valve is an essential component of a sprinkler system as it controls the flow of water from the source of water supply to the sprinkler system. It is located between the source of water supply (such as a water main or a water tank) and the sprinkler system itself. This valve allows for easy shut-off of water supply in case of emergencies or maintenance, ensuring the proper functioning of the sprinkler system.

When approaching a fire, stored pressure water extinguishers are designed to be carried in an upright position. This is because carrying it upright allows the water to be properly pressurized and ready for use. The operator is cautioned to keep the hose in hand at all times to ensure that they have immediate access to the nozzle and can quickly extinguish the fire.

The fire point is the temperature at which a liquid fuel, once ignited, will continue to burn. This is different from the flash point, which is the temperature at which a liquid fuel will produce enough vapor to ignite but may not sustain a flame. The boiling point refers to the temperature at which a liquid fuel changes into a vapor state. Therefore, the correct answer is fire point.

Heat of solution refers to the heat that is released or absorbed when a solute dissolves in a solvent. This process involves the breaking of solute-solute and solvent-solvent interactions and the formation of new solute-solvent interactions. The heat of solution can be either exothermic (heat is released) or endothermic (heat is absorbed) depending on the nature of the solute and solvent and the conditions of the solution.

The correct answer is indicating and nonindicating. In water supply distribution systems, indicating valves are used to show the position of the valve, whether it is open or closed. Nonindicating valves, on the other hand, do not have this feature and do not provide any indication of the valve position. These types of valves serve different purposes in the system and are used in different applications depending on the need for valve position indication.

Most automatic sprinkler systems are designed to control a fire by the operation of 5 heads or less. This means that the system is designed to activate and release water through a maximum of 5 sprinkler heads in order to control the fire. This design ensures that a sufficient amount of water is directed towards the fire to suppress it effectively. Having more than 5 heads operating simultaneously may result in excessive water flow, leading to water damage or inadequate suppression of the fire. Therefore, the system is designed to activate a limited number of sprinkler heads to achieve the desired control.