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Pumper
One of the greatest dangers involved in a tandem pumping operation is to - correct answer Exceed the rated pressure of the hose or pump Hard suction hoses generally have a diameter of beween - correct answer 4 and 6 inches Major advantage of medium diameter hoses is their - correct answer Flexibility of use as an attack, relay, or supply line The design of any relay pumping operation is driven mainly by the - correct answer desired flow at the fire scene 3 considerations for determining the position of the apparatus - correct answer Need for rescue, access to water, and method of attack When performing drafting operations, for a pump to operate at its rated capacity _______ inches of water must be above a traditional strainer - correct answer 24 inches When shutting down a constant pressure relay, its important to: - correct answer start with the attack pumper and work backwards to the source pumper Major disadvantage of a small diameter hose - correct answer Their high friction loss One advantage that electronic governors have over mechanical governors is that electronic governors can : - correct answer Maintain pressure in all other discharge lines if only one line turns the governor The efficiency of many priming devices is improved through the use of - correct answer an oil-injection system
Major advantage of a positive displacement pump over a centrifugal pump - correct answer It can self prime One large diameter lines gate valves are often controlled by - correct answer Handwheels Place the coded hydrants in order of capacity from least to greatest - correct answer 1 Red 2 Orange 3 Green 4 Light blue Major advantage of a reverse lay - correct answer It permits the pumper to boost the hydrant pressure easily During drafting procedures from a static water source, 1 technique for keeping the strainer off the bottom of the water source involves the use of - correct answer Rope Major advantage of a forward lay - correct answer Allows the driver/operator to monitor the fire scene It is important to monitor the water level in the onboard tank because? - correct answer You need to know if the incident requires additional water before the tank is empty Small diameter hoses are generally defined as hoses with a diameter of between - correct answer 1.5 and 2 inches If there is water discharging from lower floors during a standpipe pumping operation
- correct answer close any open valves on the floors below If the FDC has a frozen swivel - correct answer Use a double male with a double female to make the connections
When assembling a foam induction system, it is important that the distance between the bottom of the foam concentrate container and the eductor intake is no more than - correct answer 72 inches When responding to a fire where an automatic sprinkler system is present - correct answer immediate preparations should be made to supply the fire department connection Identify two ways to determine the discharge pressure for pumping operations involving a sprinkler system - correct answer 1. Check the fire department connection plate or pre-incident plan
- Use the rule of thumb that discharge pressure equals 150 psi During fire apparatus service testing, the atmospheric temperature should be between - correct answer 0* F and 100* F The piece of equipment that can be used instead of a pilot tube is the - correct answer flowmeter The pressure control service test measures pressure control devices at 3 different points. They are - correct answer 150 psi, 90 psi, and 250 psi The comparison between the gauge and flowmeter reading should differ no more than - correct answer 10% NFPA 1911 requires that a fire apparatus be given a service test - correct answer At least once a year or when it has undergone extensive pump repair To transfer pressure, a piston positive displacement pump uses the principle - correct answer of the incompressibility of a liquid 3 items that are checked for leaks during the vacuum test - correct answer 1 priming device 2 hard suction hose
3 pump 3 pieces of equipment that you may need to conduct service testing on fire apparatus - correct answer 1 tachometer 2 solid stream nozzles 3 external test gauges The benefit of an apparatus-mounted generator on a fire apparatus is that it can provide 50 kilowatts, whereas a portable generator can only porduce - correct answer 5 kilowatts On the vacuum service test, the system vacuum and pump priming device should achieve a column of mercury of at least - correct answer 22 inches When performing the serpentine exercise, you - correct answer should only travel in one direction, without striking the obstruction If yo are driving a fire apparatus that is longer than you are familiar with, make sure you - correct answer are more cautious when judging clearance so you don't run up on curbs and corners NFPA Standard 1002 requires that drivers operate a fire apparatus over a predetermined route on a public roadway that incorporates - correct answer 1. four left and right turns
- one through-intersection and two intersections that require you to stop
- at least one mile of a straight urban business street or two-lane rural road Four skills demonstrated during the ally dock exercise - correct answer 1. Interpreting spotter signals
- operating the fire apparatus safely
- using side view mirrors
- Moving the truck backward in a restricted area
In a relay operation, relay pumpers must set their intake pressure relief valves(if available) at: - correct answer 10 psi above the discharge pressure of the previous pumper When hooking up to a hydrant and additional lines are anticipated, it is best to install a - correct answer gate valve on the smaller hydrant discharge The collapse zone of a structure is approximately equal to - correct answer one and a half times the height of the structure One of the assumptions of a Maximum distance relay method is that - correct answer there is 20 psi of residual pressure at each relay pumper In a relay pumping operation, the pressure at which pumps achieve their maximum flow (with higher pressures resulting in lower volumes) is - correct answer 150 psi According to NFPA 1901, a discharge pressure relief valve must operate within - correct answer 10 seconds after discharge pressure rises 30 psi above the set level when a dry supply line is being charged, it is important to open the - correct answer bleeder valve One of the drawbacks of a piston positive displacement pump is that the - correct answer fire stream tends to pulsate Foam in a foam induction system is drawn into the system through the effect of - correct answer venturi When using a standard fog nozzle with Class A foams, little or no performance improvement has been shown in concentrations over - correct answer .5% The preferred strategy for applying foam to a standing pool of fuel fire is to - correct answer sweep the foam stream above the burning liquid and allow it to float down
Identify two ways in which the discharge pressure for pumping operations involving a sprinkler system can be found - correct answer 1. checking the fire department connection plate
- checking the pre-incident plan The discharge pressure for pumping operations involving a standpipe system can be found by - correct answer checking the pre incident plan Most jurisdictions prefer to draft from a static water source during service testing because it - correct answer is a true test of the pump's ability During an inspection of your fire apparatus, you should ensure that the foam level is
- correct answer full A fire apparatus may have steering system problems if the steering wheel can be rotated (without moving the front tires) more than - correct answer 10* The output of apparatus-mounted generators is usually no greater than - correct answer 50 kilowatts With fixed rescue tool supply systems, a manifold can be compared to - correct answer a junction box Four pre-service tests for fire apparatus - correct answer 1. Road tests
- Independent pump certification tests
- hydrostatic tests
- purchase acceptance tests When checking the priming device during the pump capacity test on an apparatus with a pump less than 1500 gpm, the priming device should be able to create the necessary vacuum in 30 sec to lift water 10 feet through - correct answer 20 feet of suction hose
Once a pound of water reaches 212*F, it takes how many additional BTUs to convert it completely to steam - correct answer 970 For fire service functions, water distribution systems are best when - correct answer their mains and secondaries are arranged in loops Driving several jets of water together to create a fog pattern is called - correct answer an impinging stream Determine TPL for a hose assembly in which there is 700 feet of 4-inch supply line which is wyed into two 2.5 inch hand lines that are 400 feet long. Each handline is flowing 200 gpm - correct answer 64.4 psi Calculate the gpm flowing from a 1.25 inch solid master stream nozzle operating at a nozzle pressure of 80 psi - correct answer 414 gpm Determine TPL for a hose assembly in which there is 300 feet of 3-inch supply line with 3-inch coupling which is wyed into two 1.5 attack lines that are 100 feet long. The attack lines are each flowing 200 gpm - correct answer 139 psi Determine PDP for a hose assembly in which 1,000 feet of 3-inch hose with 2.5 inch couplings and 1,000 feet of 2.5 inch hose are used to supply a siamese that connects to 200 of 3-inch hose with 2.5 inch couplings. Water flow is 300 gpm - correct answer 41. Determine PDP for a hose assembly in which two supply lines are siamesed together to supply a 200-foot attack line with a 1.25-inch solid stream nozzle at 50 psi. The friction loss from the supply lines is 40 psi. The friction loss from the attack line is 30 psi. In addition, there's an elevation gain between the pump and the nozzle of 50 feet. Total flow equals 350 gpm - correct answer 155 psi Determine TPL for a hose assembly in which two 500-foot sections of 3-inch hose with 2.5 inch couplings are used to supply a siamese that connects to 200 feet of 3- inch attack line with 3-inch couplings. The flow in the attack line is 328 gpm. - correct answer 25 psi
Calculate the gpm flowing from a 1.5-inch solid master stream nozzle operating at a nozzle pressure of 70 psi. - correct answer 559 gpm 3 uses of a flowmeter in fire fighting - correct answer 1. as a diagnostic tool
- for relay pumping
- during fire ground operations Using the condensed "Q" formula, the friction loss for 300 feet of 5-inch hose flowing at 500 gpm is approximately - correct answer 5.0 psi
