FREE OFAI Situational and Technical Knowledge Questions and Answers
You are using a full SCBA bottle containing 140 cubic feet of air. Your supervisor has informed you that a bell will sound when the tank is 1/4 full. When you hear the bell sound, you can assume that your tank has ____________ cubic feet of air remaining.
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.
Which of the following liquids has the highest specific gravity?
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.
Which of the following liquids had the lowest vapor density?
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.
Firefighter Sam has worked as a firefighter for two years. She feels very confident about her duties as a firefighter in all aspects with the exception of medical assessments. She's worried that her lack of knowledge in this area may one day put the crew in a dangerous situation. She's mentioned to her fellow firefighters that she'd like additional training but has been told that there's not enough time to train in this area and it's best to just acquire this knowledge through on-the-job real-life experience with patients. How should Firefighter Sam handle this situation?
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.
Which of the following liquids has the highest explosive range?
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.
Which of the following descriptions is correct?
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.
Fires which involve such metals as sodium, magnesium, titanium, aluminum, and uranium are classified as _____________ fires.
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.
You are off-duty helping a fellow firefighter work on a side job. He works as a part-time construction worker to bring in extra money for his family. You're on the job site with another 10 workers and you accidentally drop your hammer on the tile floor while walking through the newly remodeled bathroom. you discover that your hammer cracked the tile. You look around and discover that nobody else saw the accident. How would you handle this situation?
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.
John is a firefighter at a station having dinner with his crew. He overhears a more senior firefighter saying very negative things about the department's newly hired Fire Chief. John knows the senior firefighter hasn't even met the new Fire Chief yet and is basing his statements on rumors he's heard from his neighbors. John has known the Fire Chief for several years and knows these rumors aren't true. What is the best way for Firefighter John to handle this situation?
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.
You are on duty with your crew and your engine pulls into a fast food restaurant parking lot to quickly buy lunch. While you walk up to the front door of the restaurant, you are approached by a citizen who complains that there are two of your children left in a vehicle without a parent or guardian in sight. You approach the vehicle and see that the children appear to be between 10 and 13 years of age and appear to be fine. It's a cloudy day, and the outside temperature is 65 degrees. How would you handle this situation?
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.
Which one of the following hose diameters is the largest?
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.