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Maintenance and Operation of Mobile Water Supply (MWS) Apparatus, Exams of Engineering

Edward Waters College (EWC)Engineering

Detailed information on the maintenance and operation of mobile water supply (mws) apparatus, which are essential firefighting vehicles used to transport and supply water to the scene of a fire. A wide range of topics, including pre-service testing, daily inspections, water supply operations, and service testing requirements. It also addresses important safety considerations, such as controlling liquid surge within the water tank, maneuvering the apparatus in confined spaces, and maintaining good apparatus records. The information presented in this document is crucial for firefighters and apparatus operators to ensure the safe and effective use of mws apparatus in emergency situations.

Typology: Exams

2023/2024

Available from 08/27/2024

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Driver Operator Mobile Water Supply Exam
A hose has a flow rate of 500 gpm with a friction loss of 4 psi, if the flow rate increases
to 1000 gpm, then the friction loss will increase to?? - ANSWER-16 psi
A major advantage of a positive displacement pump over a centrifugal pump is that it
can? - ANSWER-pump air, making it self priming
A MWS apparatus should be started with all electrical switches in the OFF position in
order to: - ANSWER-Start engine without a load
A single portable water tank works on fires that require? - ANSWER-Relatively low over
flow rates(less than 300 gpm)
A year has passed and its time conduct the annual vacuum test on your departments
MWS apparatus. You're following the procedures for conducting the vacuum test and
you've already checked for and removed foreign matter from the hard suction hose. The
next step to perform while conducting the vacuum test is to: - ANSWER-Connect 20
Feet of the hard suction hose to the pump intake connection.
An important feature of most screw on intake pressure relief valves is that they? -
ANSWER-Have bleeder valves to vent air when a connected line is being charged.
An MWS apparatus may have steering system problems if the steering wheel can be
rotated (without moving front tires) more than: - ANSWER-10 degrees
As hose diameter increases? - ANSWER-Friction loss decreases
Before performing a quick fill operation you should make sure the tank vents are open
because failure to have adequate venting during this operation could result in? -
ANSWER-A dramatic pressure failure of the tank.
Before you drive a MWS apparatus across a bridge you should? - ANSWER-compare
the weight of the MWS apparatus to the bridges capacity.
Both the fill site time and the dump site time include the time spent? - ANSWER-
Maneuvering/positioning
Braking Distance - ANSWER-Distance a MWS apparatus travels from the time the
brakes are applied until the MWS apparatus comes to a complete stop.
Centrifugal - ANSWER-Is not self priming
Clearance between impeller hub and housing can be a problem
Compound gauge - ANSWER-Checks the pump intake pressure
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Download Maintenance and Operation of Mobile Water Supply (MWS) Apparatus and more Exams Engineering in PDF only on Docsity!

Driver Operator Mobile Water Supply Exam

A hose has a flow rate of 500 gpm with a friction loss of 4 psi, if the flow rate increases to 1000 gpm, then the friction loss will increase to?? - ANSWER-16 psi A major advantage of a positive displacement pump over a centrifugal pump is that it can? - ANSWER-pump air, making it self priming A MWS apparatus should be started with all electrical switches in the OFF position in order to: - ANSWER-Start engine without a load A single portable water tank works on fires that require? - ANSWER-Relatively low over flow rates(less than 300 gpm) A year has passed and its time conduct the annual vacuum test on your departments MWS apparatus. You're following the procedures for conducting the vacuum test and you've already checked for and removed foreign matter from the hard suction hose. The next step to perform while conducting the vacuum test is to: - ANSWER-Connect 20 Feet of the hard suction hose to the pump intake connection. An important feature of most screw on intake pressure relief valves is that they? - ANSWER-Have bleeder valves to vent air when a connected line is being charged. An MWS apparatus may have steering system problems if the steering wheel can be rotated (without moving front tires) more than: - ANSWER-10 degrees As hose diameter increases? - ANSWER-Friction loss decreases Before performing a quick fill operation you should make sure the tank vents are open because failure to have adequate venting during this operation could result in? - ANSWER-A dramatic pressure failure of the tank. Before you drive a MWS apparatus across a bridge you should? - ANSWER-compare the weight of the MWS apparatus to the bridges capacity. Both the fill site time and the dump site time include the time spent? - ANSWER- Maneuvering/positioning Braking Distance - ANSWER-Distance a MWS apparatus travels from the time the brakes are applied until the MWS apparatus comes to a complete stop. Centrifugal - ANSWER-Is not self priming Clearance between impeller hub and housing can be a problem Compound gauge - ANSWER-Checks the pump intake pressure

Daily inspection - ANSWER-Ensure auxiliary fuel tank is full Operate pump primer Inspect auxiliary winterization system. Direct pumping operation Nurse tanker operation Portable water tank operation - ANSWER-1. MWS apparatuses pump water from their tanks directly into the fire pump of the attack apparatus.

  1. One MWS apparatus parks next to the attack apparatus supplying it with a discharge line
  2. MWS apparatuses dump water into independent tanks and the dump site pumper drafts Discharge pressure gauge test - ANSWER-Checks accuracy of discharge readings obtained when pump is in operation During MWS apparatus service testing, the atmospheric air temperature should be between: - ANSWER-0 degree F and 100 degree F During resupply operation which formula is used to determine the pump discharge pressure? - ANSWER-PDP-Required Intake Pressure+TPL Engine speed check - ANSWER-Checks the rate of the engine speed Filling an MWS apparatus from the top with a portable fill device, or an open hose butt is? - ANSWER-Only used when an MWS apparatus has no other way of being filled than through a top opening Flow Meter - ANSWER-Reads the flow of water directly in GPM Given the flow in GPM, hose length, and hose diameter, you can use a pump chart to determine the? - ANSWER- Hard suction hoses generally have a diameter of between? - ANSWER-4 and 6 inches Hydrant order...least to greatest - ANSWER-Red, Orange, Green, light blue Identify FIVE requirements for a MWS apparatus that can be found in NFPA 1901 - ANSWER-1. An MWS apparatus equipped with a fire pump must have a tank to pump line at least two inches in diameter and be capable of supplying the pump with 500 GPM until at least 80% of the tank is emptied.

Identify Three situations where you should be aware of your MWS apparatus dimensions to avoid possible hazard - ANSWER-traveling under an overpass backing into a mutual aid fire department stall maneuvering around parked cars Identify THREE statements about pressure? - ANSWER-Static pressure is usually greater than normal operating pressure Residual pressure is measured near a flowing hydrant Atmospheric pressure at 10000 feet is less than at sea level. Identify THREE steps required to complete a right turn? - ANSWER-Move the MWS apparatus to the right lane, if necessary Activate the right turn signal Check to see if the side street or road is clear Identify two advantages of having remotely operated valves as part of a gravity dump system - ANSWER-Increases safety by eliminating the need for someone to climb to the top of the apparatus tank reduces the chance of someone being pinched between the apparatus and the portable tank Identify two correct statements about hydrants - ANSWER-Grid systems with large supply mains and looping secondary mains generally have less friction losses and deterioration If hydrants are color coded, select a light blue hydrant when responding to a large incident and be sure to test the flow before connecting the hydrant to pump Identify TWO disadvantages of using a nurse tanker operation in a water shuttle? - ANSWER-All MWS apparatuses in the water shuttle are required to have a sizable fire pump dumping time for each MWS apparatus is significantly higher Identify TWO intake configurations or hose lays that will be compatible with your apparatus and provide the best flow rate. - ANSWER-One LDH with a large in line gate valve

One LDH with a manifold with one LDH and two MDHs Identify TWO primary responsibilities of the make and break personnel at a fill site during fill site operations? - ANSWER-Connect to MWS Disconnect from MWS Identify TWO true statements about an automatic transmission apparatus - ANSWER- Gears shift automatically Gives you the option of selecting a gear Identify TWO types of apparatus required to operate an effective water shuttle? - ANSWER-Pumper or fire apparatus MWS apparatus If the engine speed check proves the MWS apparatus is running at a different speed than what which it was originally rated, you need to? - ANSWER-Stop the testing until the problem is corrected. It is important to monitor the water level in the onboard tank because? - ANSWER-You need to know if the incident requires additional water before the tank is empty. NFPA 1911 requires an MWS apparatus equipped with a fire pump to be service tested:

  • ANSWER-At least once a year or when it has undergone extensive pump repair. One advantage that electronic governors have over mechanical ones is that electronic ones can? - ANSWER-maintain pressure in all other discharge lines if only one line trips the governor One recommended strategy for cooling an overheating fire pump is to? - ANSWER- Circulate water back to the tank Periodic documentation should capture things such as? - ANSWER-Safety inpections Personnel must be seated and wearing their seat belts before the MWS apparatus begins moving in all situations EXCEPT? - ANSWER-Loading hose back onto the MWS apapratus Piston - ANSWER-Multi cylinder version used for high pressure fog nozzles Pitot tube - ANSWER-Measures the velocity pressure of a stream of water Place the steps for conducting a pumping test in the correct order. - ANSWER-1. Gradually speed up the pump until the net pump discharge pressure is 150 PSI

Rotary Vane - ANSWER-Has a self-adjusting part that lowers maintenance Solid stream nozzles - ANSWER-Needed to match the volumes pumped for different tests Static pressure is available pressure at a discharge point without water flowing. Once water starts flowing from a hydrant, friction loss usually reduces static pressure to? - ANSWER-Residual pressure Static pressure is the available pressure at a discharge point without water flowing. Once water starts flowing from a hydrant, friction loss usually reduces static pressure to? - ANSWER-Residual pressure Steps for stationary operation of a PTO driven fire pump - ANSWER-1. Position the MWS apparatus

  1. Place the transmission in neutral
  2. Set the parking brake
  3. Operate the PTO control
  4. Chock the wheels Tachometer - ANSWER-Checks engine speed Tank to pump flow rate test - ANSWER-Checks whether the piping between a MWS apparatus' water tank and fire pump meets NFPA 1901's standards The condensed Q formula for a 4in hoseline is? - ANSWER-FL=Q^2/ The definition of lift is? - ANSWER-The vertical distance from the surface of the water to the middle of the intake The fill rate of an MWS is determined by? - ANSWER-Individual jurisdictions The formula for travel time used when evaluating the performance of an MWS includes a built in factor for? - ANSWER-acceleration and deceleration The gauge and flow meter readings with actual pitot tube readings. The two readings should differ by no more than: - ANSWER-10% The hand method provides a fair estimate of? - ANSWER-hose friction loss The pressure control service test measure pressure control devices at three different points. They are: - ANSWER-90 psi, 150psi, and 250psi The tank to pump flow rate test measures whether the piping between an apparatus water tank and fire pump meets the minimum flow standards of: - ANSWER-NFPA 1901

The three parts of the pressure control test require you to close the flowing valves one at a time: - ANSWER-In no less than 3 seconds and no more than 10 seconds To calculate the appliance pressure loss? - ANSWER-Add 10 psi for each appliance To disengage the pump on PTO driven pumps, begin by? - ANSWER-reducing the engine speed to idle To transfer pressure, a piston positive displacement pump uses the principle? - ANSWER-of the incompressibility of a liquid Total stopping distance - ANSWER-The sum of the reaction distance and the braking distance Tracking engine performance across time uses data collected in the: - ANSWER-fuel, oil, and mileage record. Vacuum test - ANSWER-Checks for leaks in different devices Weekly Inspection - ANSWER-Clean intake strainers What is the best explanation for characteristics of an MWS apparatus - ANSWER-An individual personality--- each may perform, react, and handle differently. What is the minimum required intake pressure of the apparatus being resupplied? - ANSWER-20 psi When an incident requires flow rates - ANSWER-two or more portable tanks When backing an MWS apparatus, it is recommended that you? - ANSWER-use the side view mirrors and a spotter. When Checking the left front or right front side of the fire apparatus, don't forget to inspect the: - ANSWER-saddle tanks When conducting a priming device test and using a pump of less than 1500 GPM, the priming device should be able to create the necessary vacuum in ____ seconds to lift water 10 feet through 20 feet of hard suction hose. - ANSWER-30 seconds When driving on an upgrade slope with a standard transmission? - ANSWER-Downshift to maintain the engine RPM and speed/ When performing a vacuum service test, once the engine is turned off, the column of mercury should fall no more than: - ANSWER-10 inches in 5 minutes