Questions and Answers
What is the primary role of company officers in the context of firefighter deployment?
What is the role of the heel person in the attack team configuration?
What indicates that truck firefighters have not properly ventilated the area?
What precaution should firefighters take before advancing through a door?
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What must the engine and truck officers remain constantly aware of during operations?
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When assessing smoke and heat conditions during an interior attack, what should firefighters be prepared for?
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What should be done if conditions indicate that the fire is being affected by wind?
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What technique is recommended for firefighters to gauge the extent of heat on a door?
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What is the purpose of the Reduced Profile Tank Shift maneuver?
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Which step is NOT part of the recommended procedure for performing the Reduced Profile Tank Shift?
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In what position can the Reduced Profile Tank Shift technique be performed?
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What should a firefighter do with their right arm during the Reduced Profile Tank Shift if they are large?
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Why is it important to lead with the right hand when passing through an obstacle?
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Which of the following is a recommended practice after all members have become proficient in performing evolutions?
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What must drivers ensure before putting a vehicle in motion?
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What is the role of the waist straps during the Reduced Profile Tank Shift?
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Which of the following situations allows exceptions to seat belt usage?
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What should be avoided when preparing to perform the Reduced Profile Tank Shift?
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What does the Chicago Municipal Code permit drivers of emergency vehicles to do at a red light?
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What is a key responsibility of drivers under emergency response conditions?
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Under what circumstances can emergency vehicles disregard traffic regulations?
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Which of the following is NOT a provision granted to emergency vehicle drivers?
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How should a driver approach an intersection while responding to an emergency?
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Which scenario is acceptable for riding on the tailboard of an emergency vehicle?
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What is the primary danger for firefighters when operating on a steel bar truss roof?
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Under what temperature and timeframe does the failure of steel bar trusses typically occur?
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What is a characteristic dimension of the steel sheets used for roofing?
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What is the best method for rapid ventilation when dealing with steel bar truss roofs?
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How long can it take to create a 4-foot by 4-foot hole in a steel deck roof?
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What is typically applied over the metal deck to help secure the insulation material?
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What is the maximum length a truss joist can be for steel bar truss roofs?
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What thickness can the insulating material on a steel deck roof reach?
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What is the first step in the MSA donning procedure before arriving at the scene of an incident?
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What should be ensured about the tail of the hood during the donning process?
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How should the hood be positioned on the body to prevent it from coming over the head in a bundle?
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What is the last piece of equipment to be donned according to the MSA donning procedure?
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What should be done immediately after putting on the protective hood?
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What is the purpose of lying the hood flat on the shoulders during the donning process?
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Why is it important to don the protective gear quickly and securely?
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What is the correct order of donning personal protective equipment based on the outlined procedure?
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Study Notes
Steel Bar Truss Roofs
- Steel bar truss roofs utilize an open bar geometry that supports a corrugated metal deck.
- Truss joists can reach lengths of up to 60 feet and spaced up to 6 feet apart.
- Roof decking consists of corrugated steel sheets, approximately 1/8 inch thick, measuring 6 feet wide and 20 feet long.
- Sheets are installed perpendicular to joists and tack welded in place.
- A layer of tar is hot mopped on the metal deck to secure insulation (up to 3 inches thick), which may be felt or rubber sheeting, often topped with another tar layer as a sealant.
Operational Challenges
- Steel bar trusses typically have a failure time of 5-10 minutes at flashover temperatures (around 1000 degrees).
- Steel deck roofs often feature skylights for quick vertical ventilation, ideally accessed via tower ladders.
- Cutting through a steel deck roof is labor-intensive, requiring around 15 minutes and one saw blade for a 4-foot by 4-foot hole.
- High heat, smoke, and obstacles can hinder personnel operations on these roofs, posing a primary danger of falling into created holes.
Firefighting Coordination
- Overcrowding behind attack teams can inhibit effective operations; officers are responsible for personnel deployment.
- Proper spacing between the nozzle firefighter and the heel person, along with keeping stairways clear during hose line advancement, is crucial.
- Effective and rapid ventilation must be conducted to facilitate the engine’s advancement towards the fire.
Wind Influence on Fire Dynamics
- Firefighters must remain alert to changing conditions, particularly the influence of wind on fire progression.
- Continuous assessment of smoke and heat conditions is necessary during interior attacks.
- Evaluate heat on doors before opening, using the back of the hand to gauge temperature.
Driving Protocols
- Non-emergency driving requires adherence to traffic laws; emergency response driving allows for certain exemptions under specific conditions.
- Drivers of emergency vehicles may park disregarding traffic codes, proceed through red lights after a complete stop, exceed speed limits carefully, and ignore some directional regulations.
- It's essential for drivers to exercise caution, especially at intersections.
SCBA Donning Procedure
- Upon arrival for incidents necessitating SCBA use, don a protective hood, facepiece, and helmet swiftly.
- Begin by wearing the hood underneath the turnout coat, ensuring it is flat against the shoulders before putting on the helmet and gloves.
- Officers should conduct drills with members to practice donning procedures effectively.
Reduced Profile Tank Shift Technique
- This maneuver allows firefighters to navigate through narrow spaces by shifting the SCBA to the side.
- Steps include loosening waist and right shoulder straps, grasping the left shoulder strap and low-pressure hose, and leading through the obstruction with the right side.
- This technique helps protect SCBA components while allowing for mobility and safety in tight environments.
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Description
This quiz focuses on the principles and construction characteristics of steel bar truss roofs featuring a steel deck. It covers the geometry, length, and spacing of truss joists and discusses the specifics of the corrugated metal decking. Perfect for engineering students and professionals looking to test their knowledge.
