Engine ops
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Questions and Answers

What material is the 904K piercing nozzle primarily made of?

  • 1020 soft alloy steel (correct)
  • Aluminum alloy
  • Stainless steel
  • Bronze

    • What is the maximum coverage area of the 904K nozzle?

  • 4,000 square feet
  • 1,000 square feet
  • 3,500 square feet
  • 2,500 square feet (correct)

    • What is a disadvantage of using the 904K piercing nozzle?

  • May encounter hidden utilities (correct)
  • Requires minimal training
  • Offers extended reach
  • Can safely extinguish fires

    • How far must the nozzle be driven into the surface for full penetration?

    <p>3.75 inches</p> Signup and view all the answers

    What is the rated flow of the 904K nozzle at 100 PSI?

    <p>175 GPM</p> Signup and view all the answers

    What type of fires is the 904K nozzle NOT used for?

    <p>Forest fires</p> Signup and view all the answers

    Which feature of the 904K nozzle helps to limit structural damage?

    <p>Small opening for operation</p> Signup and view all the answers

    What must be done before opening the shut-off valve on the 904K nozzle?

    <p>Drive nozzle into the compartment</p> Signup and view all the answers

    What is the maximum flow rate of the Elkhart Brass model nozzle at 50 PSI?

    <p>340 GPM</p> Signup and view all the answers

    Which of the following features contributes to the physical attributes of the Elkhart Brass model nozzle?

    <p>Length of 6.25 inches</p> Signup and view all the answers

    How many outlets does the Elkhart Brass model nozzle feature?

    <p>Nine outlets</p> Signup and view all the answers

    What is the diameter of the area that the Elkhart Brass model nozzle can cover when functioning?

    <p>36-foot diameter</p> Signup and view all the answers

    Which material contributes to the external finish of the Elkhart Brass model nozzle?

    <p>Chrome plated finish</p> Signup and view all the answers

    What is the weight of the Akron brass nozzle described?

    <p>4.5 lbs.</p> Signup and view all the answers

    How many variable angle orifices does the Akron nozzle feature?

    <p>Nine</p> Signup and view all the answers

    What is the female coupling size of the nozzle?

    <p>2 1⁄2 inches</p> Signup and view all the answers

    At what pressure is the nozzle capable of flowing 250 GPM?

    <p>100 PSI</p> Signup and view all the answers

    What is the diameter of the area covered by the Akron brass nozzle?

    <p>14 feet</p> Signup and view all the answers

    What is the primary method used in an indirect attack to extinguish a fire?

    <p>Converting water to steam for heat absorption</p> Signup and view all the answers

    In a direct attack on a fire, what is primarily used to achieve fire extinguishment?

    <p>Direct application of water and steam</p> Signup and view all the answers

    Which of the following scenarios best describes the sequence of actions in an indirect attack?

    <p>Creating steam and following up with direct water application</p> Signup and view all the answers

    Which of the following statements is true about both indirect and direct attacks?

    <p>Both methods aim to reduce heat and control fire spread.</p> Signup and view all the answers

    Which technique is typically followed after an indirect attack is initiated?

    <p>Direct interior attack on the remaining burning material</p> Signup and view all the answers

    What is the maximum angle of travel for the hydraulic stability system left or right?

    <p>20°</p> Signup and view all the answers

    What feature of the hydraulic stability system helps ensure safety during operation?

    <p>Locking pin for the valve</p> Signup and view all the answers

    What is the minimum angle to which the system can be lowered when manned?

    <p>14°</p> Signup and view all the answers

    What is the purpose of the storage pouch included with the safety strap?

    <p>To keep the safety strap secure when not in use</p> Signup and view all the answers

    Which of the following is a feature of the hydraulic stability system that aids in its adjustment?

    <p>Adjustable angle settings</p> Signup and view all the answers

    What is the maximum operational flow rate that should not be exceeded?

    <p>500 GPM</p> Signup and view all the answers

    What is the calculated flow rate of the 1 3/8” deluge tip at 80 psi?

    <p>505 GPM</p> Signup and view all the answers

    What is the friction loss within the RAM when flowing at 500 GPM?

    <p>9.5 lbs</p> Signup and view all the answers

    To achieve optimal flow, how much hose must be maintained in a straight line behind the RAM?

    <p>20 feet</p> Signup and view all the answers

    What is the friction loss per 100 feet when using the deluge tip at 80 psi?

    <p>55 lbs</p> Signup and view all the answers

    What is the friction loss experienced by the unit at a flow rate of 500 GPM?

    <p>6 PSI</p> Signup and view all the answers

    What is the maximum angle that the tip can rotate from center?

    <p>20° left or right</p> Signup and view all the answers

    When unmanned, what is the operational range of angles the unit can be operated from?

    <p>60° to 30°</p> Signup and view all the answers

    What adjustment does the top handle's spring-loaded mechanism allow?

    <p>Travel down to 20° and self-adjust back to 30°</p> Signup and view all the answers

    At what flow rate is the unit rated up to?

    <p>500 GPM</p> Signup and view all the answers

    What is the maximum flow rate you can achieve with a 1-1/4” tip if it is pumped at 115 psi?

    <p>498 GPM</p> Signup and view all the answers

    At what nozzle pressure does a 1-1/2” deluge tip need to be pumped to maintain its rated GPM?

    <p>55 psi</p> Signup and view all the answers

    What is the flow rate for a 1-3/8” tip at a nozzle pressure of 80 psi?

    <p>502 GPM</p> Signup and view all the answers

    Which of the following tips produces the highest friction loss per 100 feet at a nozzle pressure of 80 psi?

    <p>1-3/8” tip</p> Signup and view all the answers

    What is the flow rate of a 1” nozzle tip at a nozzle pressure of 80 psi?

    <p>266 GPM</p> Signup and view all the answers

    What does the UL classification rating of 2A indicate about the fire extinguisher?

    <p>It holds an equivalent of 2.5 gallons of water.</p> Signup and view all the answers

    What is the weight of the Amerex 240 H fire extinguisher when it is full?

    <p>28.3 lbs.</p> Signup and view all the answers

    Which of the following statements about the discharge time of the Amerex 240 H is correct?

    <p>It discharges for a maximum of 55 seconds.</p> Signup and view all the answers

    What type of fire is the Amerex 240 H specifically intended for?

    <p>Class A fires</p> Signup and view all the answers

    What is the maximum effective range for the Amerex 240 H fire extinguisher?

    <p>44-55 feet</p> Signup and view all the answers

    What is the significance of the 10-A rating for the Ansul Sentry 10 extinguisher?

    <p>Indicates it is as effective as 12.5 gallons of water</p> Signup and view all the answers

    What caution should be taken when using the Ansul Sentry 10 extinguisher in small areas?

    <p>The operator must wear protective gear to avoid irritants</p> Signup and view all the answers

    What is the maximum effective range of the Ansul Sentry 10 extinguisher?

    <p>19 feet</p> Signup and view all the answers

    How often should the Ansul Sentry 10 extinguisher be inspected?

    <p>Every year</p> Signup and view all the answers

    What does the 60-B:C rating indicate for the Ansul Sentry 10 extinguisher?

    <p>The square footage area that can be covered by the agent</p> Signup and view all the answers

    Which of the following statements accurately describes a CO2 extinguisher's capabilities?

    <p>It is effective for Class B and C fires without leaving residue.</p> Signup and view all the answers

    What is the purpose of the 10-B:C UL Rating on a CO2 extinguisher?

    <p>It specifies the square footage coverage the extinguisher can extinguish.</p> Signup and view all the answers

    What impact does wind or air movement have on the effectiveness of a CO2 extinguisher?

    <p>It can significantly reduce the extinguishing reach of the discharge.</p> Signup and view all the answers

    How frequently should a CO2 extinguisher be inspected?

    <p>Yearly.</p> Signup and view all the answers

    What is the maximum operating pressure specified for a CO2 extinguisher?

    <p>850 psi</p> Signup and view all the answers

    Which foam application rate is recommended for hydrocarbons like gasoline or diesel?

    <p>3% application rate</p> Signup and view all the answers

    What is the primary use of Class A foam?

    <p>Ordinary combustible materials</p> Signup and view all the answers

    Which statement about Class B foam application rates is true?

    <p>Application rates for polar solvents vary, with a higher rate preferred.</p> Signup and view all the answers

    What is the advantage of CFD foam compared to other types of foam?

    <p>It has a nearly unlimited shelf life when stored properly.</p> Signup and view all the answers

    In what scenario would you apply a 0.3-0.6% application rate of Class A foam?

    <p>Overhaul activities post fire suppression</p> Signup and view all the answers

    What is the recommended percentage knob setting for polar solvents when using the TASK FORCE TIP PRO/PAK?

    <p>6%</p> Signup and view all the answers

    The maximum pressure supported by the TASK FORCE TIP PRO/PAK is:

    <p>500 PSI</p> Signup and view all the answers

    Which nozzle provides the shortest reach when using the TASK FORCE TIP PRO/PAK?

    <p>Medium Expansion Nozzle</p> Signup and view all the answers

    For fuel spills and vehicle fires, the percentage knob setting should be adjusted to what value?

    <p>3%</p> Signup and view all the answers

    Which of the following is an ordinary combustible material suitable for Class A use?

    <p>Wood</p> Signup and view all the answers

    What is the required pressure at the eductor to ensure proper function?

    <p>200 PSI</p> Signup and view all the answers

    What is the maximum length of 1 3/4” hose that can be used with the 125 GPM eductor?

    <p>200 feet</p> Signup and view all the answers

    Which nozzle should be used with the 95 GPM eductor?

    <p>SM20-FLP nozzle</p> Signup and view all the answers

    How does the maximum length of hose differ between the 95 GPM and 125 GPM eductors?

    <p>The 95 GPM eductor allows for 400 feet and the 125 GPM for 200 feet.</p> Signup and view all the answers

    What is the flow rate capability of the 125 GPM eductor paired with the correct nozzle?

    <p>125 GPM</p> Signup and view all the answers

    What is the primary function of the dispatchers monitoring the cameras for State Farm Blockers?

    <p>To control and coordinate traffic around accident scenes.</p> Signup and view all the answers

    How can firefighters utilize the services of the State Farm Blockers before arriving on the scene?

    <p>They can ask for freeway assistance trucks to be dispatched.</p> Signup and view all the answers

    Which of the following best describes the method of contacting State Farm Blockers for dispatch assistance?

    <p>Using a specific code, 9 D06-FSP.</p> Signup and view all the answers

    What advantage do State Farm Blockers provide by monitoring cameras?

    <p>They offer a comprehensive view to clarify confusing locations.</p> Signup and view all the answers

    In what way do dispatchers impact the initial response to an accident scene?

    <p>They assist in locating and dispatching relevant support vehicles.</p> Signup and view all the answers

    What distinguishes the Elkhart Chief XD nozzle from the Elkhart Chief nozzle?

    <p>It features laser etched labeling.</p> Signup and view all the answers

    Which feature is NOT found in the Elkhart Chief XD nozzle?

    <p>Integrated smooth bore tips.</p> Signup and view all the answers

    How are the internal shutoffs of both the Elkhart Chief and Elkhart Chief XD nozzles characterized?

    <p>They both have a 1 3⁄4” internal shutoff feature.</p> Signup and view all the answers

    Which aspect of the Elkhart Chief XD nozzle's construction sets it apart in functionality?

    <p>It features a tapered smooth bore tip that aids in flow adjustment.</p> Signup and view all the answers

    Which characteristic is shared by both the Elkhart Chief and Elkhart Chief XD nozzles?

    <p>They utilize a 1 3⁄4” internal shutoff.</p> Signup and view all the answers

    What is the primary purpose of nozzle pressure in firefighting?

    <p>To ensure the nozzle can achieve the designed flow rate</p> Signup and view all the answers

    How is nozzle reaction defined in fire service terminology?

    <p>The force exerted back on the nozzle operator during flow</p> Signup and view all the answers

    At what nozzle pressure are smooth bore hand line nozzles designed to be effectively operated?

    <p>50 PSI</p> Signup and view all the answers

    What does flow refer to in firefighting terminology?

    <p>The quantity of water measured in gallons per minute</p> Signup and view all the answers

    Which statement accurately reflects nozzle pressure variance in different types of nozzles?

    <p>Combination and automatic nozzles have variable nozzle pressure requirements</p> Signup and view all the answers

    What is the primary reason for limiting the nozzle orifice size to no greater than half the diameter of the hose?

    <p>To maintain the optimal exit velocity of the stream</p> Signup and view all the answers

    What happens if the orifice of the nozzle exceeds half the diameter of the hose?

    <p>The reach and penetration of the water stream may be compromised</p> Signup and view all the answers

    Which statement best describes the relationship between nozzle size and fire attack effectiveness?

    <p>The size of the nozzle should be balanced with hose diameter to ensure performance</p> Signup and view all the answers

    In the context of the Freeman Principle, what is the impact of a larger orifice nozzle on stream characteristics?

    <p>It enhances the reach but may reduce penetration effectiveness</p> Signup and view all the answers

    Why is the optimal exit velocity significant for fire attack operations?

    <p>It ensures adequate reach and penetration for extinguishing fire</p> Signup and view all the answers

    What is the nozzle reaction for the 188XD Smooth Bore 1 3/16” Single Tip at 50 PSI NP?

    <p>109 lbs</p> Signup and view all the answers

    Which property is unique to the 2 1⁄2” ELKHART DB-375-GAT shutoff compared to newer models like the 2 1⁄2” ELKHART BRASS XD shutoff?

    <p>Pistol grip design</p> Signup and view all the answers

    What is the maximum flow rate of the ELKHART ST-185-AIFD 'INDY STACK' with the 1 1/4” tip at 50 PSI NP?

    <p>328 GPM</p> Signup and view all the answers

    What is the main consequence of under or over pumping a nozzle?

    <p>Changes in flow and nozzle reaction</p> Signup and view all the answers

    Which tip size of the ELKHART BRASS nozzle requires a range of pressures for desired GPM and nozzle reaction?

    <p>1 3/16” Single Tip</p> Signup and view all the answers

    What is the recommended method for cleaning nozzles according to operational guidelines?

    <p>Soak in warm water and mild degreaser</p> Signup and view all the answers

    Why is it important to use a silicone-based lubricant for the nozzle maintenance?

    <p>It prevents attracting dirt and debris due to excess grease</p> Signup and view all the answers

    Which of the following components should be checked for damage during the nozzle inspection?

    <p>The bumper and teeth of a combination nozzle</p> Signup and view all the answers

    What action should be performed while cleaning the nozzle in the warm water and degreaser mixture?

    <p>Cycling the nozzle bumper through all ranges of motion</p> Signup and view all the answers

    What is a recommended practice after cleaning a nozzle?

    <p>Dry it with a rag and apply a minimum amount of lubricant</p> Signup and view all the answers

    What principle emphasizes that hose advancement should be a collective effort?

    <p>Teamwork and communication are essential.</p> Signup and view all the answers

    What is the recommended approach when stretching hose lines to a fire?

    <p>Maintain a steady pace for better efficiency.</p> Signup and view all the answers

    Which of the following statements best reflects the correct technique for hose line advancement?

    <p>Moving slowly can reduce long-term hose stretch difficulties.</p> Signup and view all the answers

    Why is moving quickly when advancing hoses discouraged?

    <p>It can lead to increased friction and difficulties later.</p> Signup and view all the answers

    What does the saying 'slow is smooth and smooth is fast' imply about hose advancement?

    <p>Efficiency increases with careful, deliberate movements.</p> Signup and view all the answers

    What is the primary responsibility of the attack firefighter before entering the fire area?

    <p>Check the nozzle for flowing water</p> Signup and view all the answers

    In what stance does the attack firefighter typically move when working with the hose?

    <p>Three-point stance</p> Signup and view all the answers

    Which technique is emphasized for hose manipulation by the attack firefighter?

    <p>Keeping the nozzle out in front with good technique</p> Signup and view all the answers

    What action does the attack firefighter perform before approaching the fire with the hose?

    <p>Check the nozzle for flowing water</p> Signup and view all the answers

    Which component is NOT part of the attack package that firefighters are instructed to follow?

    <p>Temperature</p> Signup and view all the answers

    What is the primary responsibility of the backup firefighter at the front door?

    <p>To relay findings about the building layout to the nozzle firefighter.</p> Signup and view all the answers

    Which of these actions is NOT part of the backup firefighter's responsibilities?

    <p>Fighting the fire from outside the building.</p> Signup and view all the answers

    What does the 'LFL' acronym stand for in regard to the backup firefighter's assessment?

    <p>Life, Fire, Layout.</p> Signup and view all the answers

    How should the backup firefighter assist with hose advancement?

    <p>By pre-loading the hose and ensuring there are no pinch points.</p> Signup and view all the answers

    What is the significance of sweeping the floor around the door?

    <p>To check for victims hiding in the area.</p> Signup and view all the answers

    What is the primary responsibility of the Control firefighter in a hose management operation?

    <p>To manage the line from the backup firefighter to the door</p> Signup and view all the answers

    What should recruits remember about pre-loading hose during operations?

    <p>To pre-load only what the building allows without forcing it</p> Signup and view all the answers

    Which task is NOT part of the Door firefighter's responsibilities?

    <p>Pre-loading hose inside the building before entry</p> Signup and view all the answers

    How does the Control firefighter assist in hose advancement?

    <p>By minding pinch points and pre-loading hose effectively</p> Signup and view all the answers

    What is a key duty of the Door firefighter when splitting the door?

    <p>To keep the entryway neat and clear during operations</p> Signup and view all the answers

    When should a 2 1/2” handline be considered for use according to the ADULTS acronym?

    <p>In cases of advanced fire on arrival or large, non-compartmentalized areas</p> Signup and view all the answers

    What type of fire scenario necessitates the use of two 1 3/4” hose lines?

    <p>Fires extending to three or more rooms</p> Signup and view all the answers

    In which situation should a firefighter consider using a 2” or 2 1/2” hose line?

    <p>During defensive operations in commercial structures</p> Signup and view all the answers

    Which of the following is NOT part of the ADULTS acronym for utilizing a 2 1/2” handline?

    <p>Supervised fire drills</p> Signup and view all the answers

    What is the primary consideration for selecting the size of the hose line in case of a fire on one floor or more?

    <p>Employing a 2 1/2” hose line is recommended</p> Signup and view all the answers

    Which of the following accurately describes a commercial space in this context?

    <p>A large, open area with a higher-than-normal fire load.</p> Signup and view all the answers

    What characteristics differentiate a commercial space from a multi-story office building?

    <p>The number of floors and types of occupancy.</p> Signup and view all the answers

    Why are commercial spaces typically considered high-risk locations?

    <p>They usually have a larger than normal fire load.</p> Signup and view all the answers

    Which of the following types of buildings would not be classified as a commercial space?

    <p>A common hall apartment building.</p> Signup and view all the answers

    What does the definition of a commercial space imply about its structure?

    <p>It is characterized by a lack of compartments.</p> Signup and view all the answers

    What happens to the nozzle when approaching flows of 250 GPM with a 2” handline?

    <p>The nozzle experiences increased hydraulic forces.</p> Signup and view all the answers

    What is a consequence of exceeding optimal flow rates with a 2” handline?

    <p>The controllability of the nozzle decreases significantly.</p> Signup and view all the answers

    What limitation does a firefighter face at higher flow rates with a handline?

    <p>Diminished ability to achieve desired water coverage.</p> Signup and view all the answers

    Which factor should firefighters consider when operating the 2” handline at high flows?

    <p>The added hydraulic forces that affect stability.</p> Signup and view all the answers

    Why is it important for the nozzle firefighter to avoid flows exceeding 250 GPM?

    <p>Control over the nozzle may be compromised at higher flows.</p> Signup and view all the answers

    What is a significant advantage of using a 2” line in firefighting operations within multi-level office buildings?

    <p>Ability to operate at appreciable pump discharge pressure farther away from the apparatus</p> Signup and view all the answers

    Which characteristic of the 2” line contributes to maximizing its potential in complex building structures?

    <p>Its increased size combined with a target flow rate of 210 GPM helps decrease friction loss.</p> Signup and view all the answers

    How does the 2” line improve operational efficiency in firefighting?

    <p>By providing a longer line option for difficult stretches in confined areas.</p> Signup and view all the answers

    What impact does the target flow of 210 GPM have on the functionality of the 2” line?

    <p>It provides sufficient flow to combat fires over longer distances effectively.</p> Signup and view all the answers

    What is one of the key identities associated with the 2” line in firefighting operations?

    <p>It significantly widens the operational envelope for firefighting.</p> Signup and view all the answers

    What is the target flow range for the 2 1⁄2” handline?

    <p>260 GPM to 328 GPM</p> Signup and view all the answers

    Which nozzle tip provides the highest flow rate at 50 psi for the smooth bore nozzles mentioned?

    <p>1 1/4” tip</p> Signup and view all the answers

    Which configuration allows engine companies to effectively utilize a smooth bore's operational range for the 2 1⁄2” hose?

    <p>Utilizing the 1 3/16” tip within 40-60 psi</p> Signup and view all the answers

    What is a recommended practice regarding flows over 300 GPM in an attack situation?

    <p>They are not recommended unless positioned fixedly.</p> Signup and view all the answers

    What range of psi is typically not achievable with the 1 3/4” handlines concerning the smooth bore?

    <p>40-60 psi</p> Signup and view all the answers

    Where is the 2 1⁄2” attack line usually loaded on a CFD engine?

    <p>Rear of the engine</p> Signup and view all the answers

    What are the distinctive color markings of the 2 1⁄2” attack line?

    <p>White with red racing stripes</p> Signup and view all the answers

    If the 2 1⁄2” attack line is not preconnected, where is the female coupling typically found?

    <p>At the bottom of the stack in the bed</p> Signup and view all the answers

    What is the typical length of a preconnected 2” attack line?

    <p>200 feet</p> Signup and view all the answers

    What configuration is common for loading the 2 1⁄2” attack line?

    <p>Preconnected to the rear discharge</p> Signup and view all the answers

    What is the primary movement technique recommended for firefighters when utilizing a nozzle in a large commercial space?

    <p>A sweeping motion at the ceiling level from left to right</p> Signup and view all the answers

    What angle should firefighters aim for while performing the sweeping motion with the nozzle?

    <p>45° from center</p> Signup and view all the answers

    Which of the following is NOT a benefit of using the sweeping nozzle technique at ceiling level?

    <p>Lowering the temperature of the floor directly</p> Signup and view all the answers

    Why is it important to lower the angle with each sweep while using the nozzle in a commercial setting?

    <p>To effectively cool areas progressively closer to the ground</p> Signup and view all the answers

    What is the main goal of the sweeping motion performed by firefighters at ceiling level?

    <p>To prepare the space for possible entry and operation</p> Signup and view all the answers

    What is a critical reason why fires may not be extinguished during firefighting operations?

    <p>Insufficient water supply or access to the seat of the fire</p> Signup and view all the answers

    Which of the following best describes the importance of nozzle reach and penetration in firefighting?

    <p>They are essential for effective fire control and suppression.</p> Signup and view all the answers

    Which statement accurately reflects the benefits of nozzle characteristics in firefighting?

    <p>Different nozzle designs facilitate various firefighting strategies.</p> Signup and view all the answers

    What can be considered a major challenge faced by firefighters when attempting to extinguish a fire?

    <p>Environmental conditions affecting water reach</p> Signup and view all the answers

    How do nozzle capabilities impact the strategy used during firefighting operations?

    <p>Capable nozzles allow for tailored tactics based on fire conditions.</p> Signup and view all the answers

    What is the primary reason the 2” line is considered more maneuverable than the 2 1⁄2” line?

    <p>The weight difference in the charged lines.</p> Signup and view all the answers

    Which situation might make using the 2” line more advantageous?

    <p>Tight environments with many navigational challenges.</p> Signup and view all the answers

    Which statement accurately reflects the handling characteristics of the 2 1⁄2” line?

    <p>It requires more effort to advance without preloading.</p> Signup and view all the answers

    Why is preloading not as effective with the 2 1⁄2” line compared to smaller sizes?

    <p>It is too heavy to be effectively preloaded.</p> Signup and view all the answers

    What is the total weight of a charged 50’ section of the 2” line?

    <p>68 pounds</p> Signup and view all the answers

    What happens to a nozzle firefighter's risk of becoming unseated when flowing from a larger hose size?

    <p>The risk increases as size and target flow increase.</p> Signup and view all the answers

    In which scenario is a nozzle firefighter most vulnerable to becoming unseated?

    <p>When flowing after making a turn without proper hose alignment.</p> Signup and view all the answers

    Which factor is not contributing to the danger of becoming unseated while flowing?

    <p>The experience level of the firefighter.</p> Signup and view all the answers

    Why is the position of the hose significant for nozzle firefighters after making a turn?

    <p>It influences the likelihood of unseating.</p> Signup and view all the answers

    What is true about the correlation between hose size and firefighter safety?

    <p>Larger hose sizes increase the risk as flow and size escalate.</p> Signup and view all the answers

    Why is it essential to prioritize flow when selecting a handline for firefighting?

    <p>Flow is the primary factor in achieving effective extinguishment.</p> Signup and view all the answers

    What is a potential risk of opting for a handline with less than favorable target flow?

    <p>It risks compromising the overall efficiency in extinguishing the fire.</p> Signup and view all the answers

    What aspect of firefighting equipment correlates most directly with extinguishment success?

    <p>The target flow rate selected for the handline.</p> Signup and view all the answers

    Which of the following considerations might detract from prioritizing flow in firefighting operations?

    <p>The potential for better firefighting maneuverability.</p> Signup and view all the answers

    How should a firefighter balance flow and maneuverability when selecting a handline?

    <p>Prioritize flow above all to ensure extinguishment efficiency.</p> Signup and view all the answers

    What is a primary advantage of the triple fold deployment method?

    <p>It deploys quicker than modified minuteman loads</p> Signup and view all the answers

    Which of the following is a limitation of the triple fold method?

    <p>It lacks a shoulder load for tight placement</p> Signup and view all the answers

    In what scenario is the triple fold method less effective?

    <p>Around dense obstacles like cars and fences</p> Signup and view all the answers

    How does the number of moving parts in the triple fold method affect its deployment?

    <p>Fewer moving parts decrease deployment time</p> Signup and view all the answers

    What aspect of the triple fold method makes it a reliable choice for quick deployment?

    <p>The reduced number of components minimizes errors</p> Signup and view all the answers

    What is a potential limitation of using the 50' bundle in firefighting operations?

    <p>It may not be sufficient to reach taller objectives.</p> Signup and view all the answers

    Which characteristic of the modified minuteman 50' bundle could lead to deployment issues?

    <p>It contains more moving parts than simpler configurations.</p> Signup and view all the answers

    How does the manageability of the 50' bundle compare to the 100' bundle?

    <p>It is easier to manage on the shoulder due to its shorter height.</p> Signup and view all the answers

    What advantage does the 50' bundle provide in terms of splitting the load?

    <p>It splits easier than a triple-layer load.</p> Signup and view all the answers

    Which of the following statements is true regarding the deployment speed of the 50' bundle?

    <p>It is slower to deploy than a triple fold.</p> Signup and view all the answers

    What advantage does the modified minuteman 100' bundle have compared to the triple fold?

    <p>It is more versatile around cars and fixed obstacles.</p> Signup and view all the answers

    Which disadvantage is associated with the management of the modified minuteman 100' bundle?

    <p>It is prone to tangling without proper securing.</p> Signup and view all the answers

    How does the modified minuteman 100' bundle improve usability for firefighters?

    <p>It decreases the length of the dead stack and increases hose availability.</p> Signup and view all the answers

    What is a significant drawback of using the modified minuteman 100' bundle?

    <p>It does not deploy as quickly as simpler fold options.</p> Signup and view all the answers

    What characteristic of the modified minuteman 100' bundle makes it challenging to work with?

    <p>It can be difficult to manage on the shoulder if not secured.</p> Signup and view all the answers

    What is the recommended length of the initial attack line when using a garden stretch in apartments or townhomes?

    <p>100 feet</p> Signup and view all the answers

    Where should the appliance be ideally placed when preparing for a vertical stretch using a garden stretch?

    <p>At least ten feet from the attack line's entrance point</p> Signup and view all the answers

    What is preferred for supplying the backup line during a garden stretch operation?

    <p>A secondary 2 1⁄2” or 3” trunk line</p> Signup and view all the answers

    What is critical for selecting the appropriate hose line when executing a garden stretch?

    <p>Understanding district familiarization and preplanning</p> Signup and view all the answers

    What does the backup line need to match to ensure effective fire extension coverage?

    <p>The length of the structure being protected</p> Signup and view all the answers

    What must be monitored when the hose is dropped over an open landing to ensure safety?

    <p>The weight of the hose</p> Signup and view all the answers

    What is a significant consideration when dropping the acme pack hose through railing spindles?

    <p>The layout of the landing</p> Signup and view all the answers

    In terms of procedure, how should the hose be positioned if it is to be charged while hanging over an open railing?

    <p>It should be held by an operator</p> Signup and view all the answers

    Which method of dropping the hose carries a greater risk of it being pulled off the landing?

    <p>Dropping the hose over the top of the railing</p> Signup and view all the answers

    What is a necessary action before charging a hose that has been dropped over an open landing?

    <p>Ensure the area below is clear</p> Signup and view all the answers

    What is the main benefit of placing engines in series during a water supply operation?

    <p>It creates a built-in system backup in case of failures.</p> Signup and view all the answers

    Why should interior lines not be gated down below their normal operating pressures?

    <p>It compromises the effectiveness of water supply to other areas.</p> Signup and view all the answers

    What is the ideal placement of a supply engine in relation to a hydrant?

    <p>Directly on the hydrant with a short section of hose.</p> Signup and view all the answers

    What should pump operators do to maintain effectiveness on gated lines?

    <p>Regularly check the pressure and flow rates.</p> Signup and view all the answers

    What is the primary reason for having the supply and attack engines operate in series?

    <p>To maximize water supply capacity and ensure redundancy.</p> Signup and view all the answers

    What is the primary advantage of using a 3” supply line in residential fire incidents?

    <p>It fills faster, resulting in more water available for the attack engine.</p> Signup and view all the answers

    What flow rate can a single 3” supply line provide over a shorter lay?

    <p>800 GPM</p> Signup and view all the answers

    How much water is required to fill a 3” supply line per 100 feet?

    <p>37 gallons</p> Signup and view all the answers

    In terms of speed and efficiency, how does a 3” supply line compare to other supply line options?

    <p>It can be connected rapidly and efficiently.</p> Signup and view all the answers

    Why is it important that more of the supply engine's water reaches the attack engine?

    <p>It minimizes water waste during the initial flow.</p> Signup and view all the answers

    What can potentially trigger the Pump Boss to enter 'RPM LIMIT MODE' when using tank water and a master stream?

    <p>Rapidly opening a discharge while the pump is set at operating pressure</p> Signup and view all the answers

    What should an operator do if the Pump Boss has entered 'RPM LIMIT MODE'?

    <p>Gating down the discharge to increase pressure</p> Signup and view all the answers

    What occurs if the engine RPM is increased prior to opening the discharge?

    <p>It could lead to a decrease in pressure</p> Signup and view all the answers

    What is a critical factor to monitor when using a master stream while on tank water?

    <p>The diameter of the supply line from the tank to the pump</p> Signup and view all the answers

    What can happen if the operator rapidly opens the deck gun discharge when the pump is at operating pressure?

    <p>The demand may exceed the feed line capacity</p> Signup and view all the answers

    What is the initial action a pump operator should take if too much discharge pressure is detected while the supply driver is at idle?

    <p>Radio the supply driver to check their discharge pressure setting.</p> Signup and view all the answers

    If the pressure is still too high after addressing the supply driver's discharge pressure, what should the supply driver do next?

    <p>Place their engine into neutral and be prepared to resume pumping if needed.</p> Signup and view all the answers

    What alternative method can a pump operator use to manage excessive pressure in subzero temperatures?

    <p>Alternate between tank water and supply line by manipulating valves.</p> Signup and view all the answers

    What should the attack operator focus on when using tank water to manage discharge pressure?

    <p>Monitoring the amount of water in the tank while opening and closing valves.</p> Signup and view all the answers

    What is a potential solution if an attack operator has tried all options but still experiences excessive pressure?

    <p>Gating down the intake valves to reduce pressure.</p> Signup and view all the answers

    What does the Master Intake Gauge indicate when water is not flowing?

    <p>Static pressure</p> Signup and view all the answers

    What happens to the pressure reading on the intake gauge when water begins to flow from the pump?

    <p>It decreases</p> Signup and view all the answers

    How is residual pressure defined in the context of hydraulic systems?

    <p>Pressure resulting from water flow during discharge</p> Signup and view all the answers

    What action must be taken to observe a change in pressure from static to residual?

    <p>Open a discharge valve</p> Signup and view all the answers

    What is the initial pressure reading considered before any water is discharged?

    <p>Static pressure</p> Signup and view all the answers

    What does the phrase 'the first line is free' imply in firefighting operations?

    <p>The first line should not be counted when evaluating remaining hydrant flow.</p> Signup and view all the answers

    In what scenario should an operator consider the static pressure reading on the intake gauge as the initial pressure?

    <p>If the first line is flowing before the water supply is established.</p> Signup and view all the answers

    Which of the following statements best describes the relationship between defensive operations and hydrant supply?

    <p>Securing the hydrant is generally recommended before engaging in defensive operations.</p> Signup and view all the answers

    Why should the operator not factor the first line's flow into the remaining supply when it is flowing before the supply is established?

    <p>Due to the fact that the first line does not utilize any hydrant water.</p> Signup and view all the answers

    What procedure should an operator follow when the first line is flowing without an established hydrant supply?

    <p>Use the initial pressure reading as the static pressure for remaining operations.</p> Signup and view all the answers

    What occurs when there is a 0-10% drop in static pressure?

    <p>The remaining supply is three times the amount that caused the drop.</p> Signup and view all the answers

    When the residual pressure drops to 85 PSI from 100 PSI, what is the percentage drop?

    <p>15%</p> Signup and view all the answers

    What amount of water remains when there is a 16-20% drop in pressure with a 500 GPM usage?

    <p>500 GPM</p> Signup and view all the answers

    What is the primary concern when there is a drop of more than 20% in intake pressure?

    <p>Crews should monitor their intake pressure closely to avoid loss of pressure.</p> Signup and view all the answers

    What does a static pressure of 100 PSI indicate when leaking water from a backup line causes a drop to 90 PSI?

    <p>There is an ample water supply remaining.</p> Signup and view all the answers

    In the scenario of an 11-15% drop, how much water is estimated to remain when the drop was caused by a flow of 250 GPM?

    <p>500 GPM</p> Signup and view all the answers

    Why is it difficult to determine the remaining supply when the drop in pressure exceeds 20%?

    <p>There is roughly half of the amount of water that caused the drop remaining.</p> Signup and view all the answers

    What mathematical relationship is used to determine the percentage drop in pressure?

    <p>Drop in pressure divided by static pressure.</p> Signup and view all the answers

    What is the primary feature of a simple water supply?

    <p>Directly connects the hydrant to the fire truck</p> Signup and view all the answers

    Which of the following best describes the establishment of a series water supply?

    <p>Connects a series of hoses between multiple pumpers and hydrants</p> Signup and view all the answers

    What is a significant limitation of a simple water supply system?

    <p>It leaves crews dependent on hydrant pressure if mechanical failure occurs</p> Signup and view all the answers

    In establishing a series water supply, which alternative hose sizes are acceptable?

    <p>3&quot; or 5&quot; hoses</p> Signup and view all the answers

    What is typically regarded as the top priority in any pump operation?

    <p>Ensuring a constant, uninterrupted water supply</p> Signup and view all the answers

    What is the preferred maximum distance for placing the supply pumper from the positive source?

    <p>25 feet</p> Signup and view all the answers

    Why is it important to position the supply pumper as close to the hydrant as possible?

    <p>To ensure quick access to the water source</p> Signup and view all the answers

    What consequence might occur if the supply pumper is placed more than 25 feet away from the positive source?

    <p>Increased friction loss</p> Signup and view all the answers

    Which factor does NOT influence the placement of the supply pumper?

    <p>Availability of personnel</p> Signup and view all the answers

    What is the primary reason to maintain a supply pumper within 25 feet of the positive source?

    <p>To optimize water delivery efficiency</p> Signup and view all the answers

    What happens when the supply pumper increases its discharge pressure?

    <p>It allows the attack pumper to draw more volume of water.</p> Signup and view all the answers

    What situation would cause the supply pumper to increase its discharge pressure?

    <p>The attack pumper is drawing more water than is accessible.</p> Signup and view all the answers

    What is the role of the supply pumper in relation to the attack pumper?

    <p>It compensates for the attack pumper's inadequate intake.</p> Signup and view all the answers

    Under what condition does the intake pressure at the attack pumper decrease?

    <p>When the attack pumper exceeds the available water flow.</p> Signup and view all the answers

    How does the supply pumper affect the performance of the attack pumper?

    <p>It adjusts the pressure to enhance water flow to the attack pumper.</p> Signup and view all the answers

    What must be done once the attack engine’s tank water is depleted to 1/4 of a tank?

    <p>Cut in the supply engine's tank water</p> Signup and view all the answers

    Which statement correctly describes the water usage sequence between the attack and supply engines?

    <p>The attack engine uses 3/4 of its tank water before the supply engine's water is utilized</p> Signup and view all the answers

    What is the main purpose of the sequence of actions involving the attack and supply engines’ tanks?

    <p>To maximize the efficiency of water usage while securing a permanent supply</p> Signup and view all the answers

    When does the supply driver need to secure a permanent water supply in this operational scenario?

    <p>While the attack engine is using its water supply</p> Signup and view all the answers

    What does cutting in the supply engine's tank water enable during an operation?

    <p>It gives additional time to the supply driver to establish a water source</p> Signup and view all the answers

    What is the actual discharge capacity of a two-stage pump operating in pressure mode if its total capacity is 1500?

    <p>1050</p> Signup and view all the answers

    Which calculation shows how to determine the actual discharge capacity at 70% efficiency for a 1500 capacity pump?

    <p>1500 x 0.70</p> Signup and view all the answers

    What percentage of the total capacity does a two-stage pump achieve when considered in pressure mode?

    <p>70%</p> Signup and view all the answers

    If a two-stage pump has a total capacity of 1500, what would be the output if it operates at 80% efficiency instead of 70%?

    <p>1350</p> Signup and view all the answers

    What is the difference in actual discharge capacity between a pump operating at 70% versus 50% efficiency with a total capacity of 1500?

    <p>500</p> Signup and view all the answers

    In which scenario would the demand for water generally exceed the capabilities of a two-stage pump in pressure mode?

    <p>Multi-line operations</p> Signup and view all the answers

    Which operation is likely to place a strain on the water supply, demanding more than what a two-stage pump can provide?

    <p>Ladder pipe operations</p> Signup and view all the answers

    Which of the following operations would typically not exceed the capability of a two-stage pump in pressure mode?

    <p>Routine maintenance procedures</p> Signup and view all the answers

    What type of fire operation is most likely to require water demands that surpass those manageable by a two-stage pump?

    <p>Deck gun operations</p> Signup and view all the answers

    Which operation is least likely to require water demands exceeding a two-stage pump's capabilities, but may still approach its limits?

    <p>Single line fire suppression</p> Signup and view all the answers

    Study Notes

    Actual Discharge Capacity of Two-Stage Pump

    • Actual discharge capacity in pressure mode is approximately 70% of the total capacity.
    • For a pump with a total capacity of 1500 gallons per minute (GPM), the discharge capacity in pressure mode is 1050 GPM.
    • Demand exceeding pump capacity can occur during multiple line operations, quick attack operations, deck gun operations, and ladder pipe operations.

    TRIPLE FOLD

    • Advantages:
      • Deploys faster than modified minuteman loads.
      • Fewer moving parts, reducing deployment errors.
    • Disadvantages:
      • Less versatile around obstacles like cars and fences.
      • Lacks a shoulder load feature for tight spaces.

    MODIFIED MINUTEMAN – 50’ BUNDLE

    • Advantages:
      • Easier to shoulder carry; shorter than the 100' bundle.
      • Easier to split cars than a triple layer load.
    • Disadvantages:
      • 50' length may be insufficient to reach targets.
      • Slower deployment compared to a triple fold.
      • More moving parts, potentially increasing deployment issues.

    MODIFIED MINUTEMAN – 100’ BUNDLE

    • Advantages:
      • More versatile around cars and fixed obstacles.
      • Shorter and more manageable dead stack thanks to bundling.
      • Provides more usable hose near the entry point.
      • Easier to split cars, reducing dragging.
    • Disadvantages:
      • Can be difficult to manage on the shoulder, prone to "spaghetti."
      • Slower deployment compared to the triple fold.
      • More moving parts, potentially increasing deployment issues.
    • Added Information:
      • Useful for garden stretches of apartments, condos, or townhomes, covering the fire unit and an adjacent unit.
      • A 100' Acme pack is often sufficient.
      • Preplanning and familiarity with the district is critical for hose line selection.
      • A backup line, typically a secondary 2 1⁄2" or 3" trunk line, is preferable, matching lengths to cover potential fire extensions.
      • Exterior Lines: Reducing flow is usually not a safety concern for exterior crews. Pump operators must ensure effectiveness.
      • Interior Lines: Gating down interior lines to set pressure (after other attempts) is acceptable; avoiding gating to water other areas is key.
    • Vertical Stretch—Dropping the Bundle:
      • A 100' Acme pack is carried to the target landing.
      • Interior crews pass the female coupling and drop it to the pump operator below.
      • The hose can be dropped over railings.
      • Dropping over open landings requires caution to prevent dragging.
    • Supply Engine Placement: Placing an engine as close as possible to the hydrant minimizes friction loss. Series systems are backup systems. Aim for within 25 feet of the hydrant
    • 3" Supply Line Information:
      • Provides enough flow for most residential fires.
      • Requires roughly 37 gallons of water per 100 feet to fill.
      • Readily connected, delivering up to 800 GPM over shorter distances. Capable of primary and backup handlines
    • Master Stream Considerations on Tanker Water:
      • Rapid master stream discharge might exceed tank capacity. This triggers "RPM LIMIT MODE." Decreasing RPM or gating discharge restores pressure. Increasing RPM will worsen the issue.
    • Excessive Discharge Pressure:
      • Typically results from high intake pressure. Pump Boss engines throttle down to reduce pressure.
      • If idle, communicate with the supply driver to adjust discharge pressure.
      • If both are idle, the supply engine can go into neutral.
      • Dump excess pressure through a non-critical discharge (tank fill).
      • In freezing temperatures, alternate tank water and supply to prevent ice formation. If necessary, gate down attack intake valves. If needed, gate down attack lines to maintain hose pressure.
    • Supply Pumper Support for Attack Pumper: Increase discharge pressure to increase intake to the attack pumper.
    • Conserving Attack Engine Water: Use the attack engine's tank water first. Switch after it reaches ¼ full.
    • Simple vs. Series Water Supply:
      • Simple Supply: A direct connection, limited by the hydrant.
      • Series Supply: A separate supply engine to the attack engine, providing redundancy.
    • Static and Residual Pressure:
      • Static: Pressure when no water flows.
      • Residual: Pressure during flow from the hydrant.
    • FIRST LINE IS "FREE": The initial attack lines, before a supply is established, are not considered in overall supply calculation. Use initial intake pressure as the static pressure.
    • Hydrant Supply Calculation:
      • 0-10% static pressure drop = 3x initial flow remaining.
      • 11-15% = 2x.
      • 16-20% = 1x.

      • 20% = ~ half.

      • High static doesn't reflect GPM until known flow. Connections to the same water main impact available supply. 10 PSI residual is a safety minimum.

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    This quiz covers the detailed specifications and operational guidelines for the 904K piercing nozzle. Learn about its material composition, connection types, pressure resistance, and various uses in firefighting scenarios. Understand how to effectively operate this essential firefighting tool.

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