Explanation:
Ethanol has the lowest vapor density among the options provided. Vapor density is a measure of a substance's weight compared to an equal volume of air, and substances with lower vapor density tend to evaporate more readily and form flammable vapor-air mixtures at lower concentrations. Understanding the vapor density of various liquids is essential for firefighters to assess fire hazards and determine appropriate firefighting strategies.
Explanation:
Confronting the senior firefighter privately allows John to address the issue without causing embarrassment or confrontation in front of the rest of the crew. It also gives John the opportunity to share any accurate information he has about the Fire Chief and express concern about the potential damage of spreading false rumors. This approach promotes professionalism and addresses the issue directly while maintaining respect for all involved parties.
Explanation:
Kerosene typically has a higher specific gravity compared to the other liquids listed. Specific gravity is the density of a substance compared to the density of water. Substances with higher specific gravity sink in water. Understanding the specific gravity of different liquids is essential for firefighters as it helps them assess fire hazards and determine appropriate firefighting strategies, such as selecting the right extinguishing agents.
Explanation:
It's essential for Firefighter Sam to address her concerns about her lack of knowledge in medical assessments. By informing her captain and requesting additional training opportunities, she shows initiative and a commitment to improving her skills for the safety of herself, her crew, and the community. Training with more experienced crew members can provide valuable hands-on experience and mentorship, helping her gain confidence and proficiency in medical assessments over time.
Explanation:
Leaving children unattended in a vehicle can be dangerous, especially if the weather conditions are extreme. In this situation, the children appear to be unharmed, and the weather is not overly hot or cold. Option C allows the firefighters to maintain a presence near the vehicle while ensuring they can quickly return to service. They can monitor the situation and provide assistance if needed while respecting the urgency of their duties. If the situation escalates or the children show signs of distress, further action can be taken.
Explanation:
If a full SCBA bottle contains 140 cubic feet of air and the bell sounds when the tank is 1/4 full, then the remaining air in the tank would be 3/4 of the total capacity. Therefore, 3/4 of 140 cubic feet is (3/4) * 140 = 105 cubic feet. To find out the remaining air when the tank is 1/4 full, we subtract 105 from the total capacity, which is 140. Thus, 140 - 105 = 35 cubic feet. This means that when the bell sounds, there are 35 cubic feet of air remaining in the tank.
Explanation:
Class D fires involve combustible metals such as sodium, magnesium, titanium, aluminum, and uranium. These fires require specialized extinguishing agents and firefighting techniques due to the unique properties and challenges associated with combating metal fires. Understanding the classification of fires is crucial for firefighters to effectively respond to and extinguish different types of fire emergencies.
Explanation:
Hose diameter is typically expressed as a fraction of an inch. In this case, 17/20 inches is the largest fraction among the options provided, indicating the largest hose diameter. Therefore, option A, 17/20 inches, is the correct answer. This question evaluates technical knowledge by assessing the applicant's understanding of firefighting equipment, specifically hose diameters, which is crucial for effective fire suppression operations.
Explanation:
Option B demonstrates integrity and accountability. As a firefighter, honesty and responsibility are essential values, both on and off duty. Informing your friend about the accident and offering to pay for the damage shows respect for his property and professionalism in addressing the situation promptly. It also helps maintain trust and integrity within the team, fostering a positive working relationship.
Explanation:
Class B fires involve flammable liquids and gases. These fires are characterized by substances such as gasoline, oil, grease, and propane. Understanding the classification of fires is essential for firefighters to determine the appropriate extinguishing agents and firefighting techniques required to safely and effectively extinguish different types of fires.
Explanation:
Ethanol has the highest explosive range among the options provided. It forms explosive mixtures with air over a wide concentration range, making it highly flammable and prone to ignition. Understanding the properties of different fuels, including their explosive ranges, is crucial for firefighters to effectively manage fire incidents and ensure safety during firefighting operations.
