Driver Operator Mobile Water Supply
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?? - Correct Answer 16 psi
A major advantage of a positive displacement pump over a centrifugal pump is that it can? - Correct Answer pump
air, making it self priming
A MWS apparatus should be started with all electrical switches in the OFF position in order to: - Correct Answer Start
engine without a load
A single portable water tank works on fires that require? - Correct 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: - Correct 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? - Correct 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: - Correct Answer 10 degrees
As hose diameter increases? - Correct 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? - Correct Answer A dramatic pressure failure of the tank.
Before you drive a MWS apparatus across a bridge you should? - Correct 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? - Correct Answer Maneuvering/positioning
Braking Distance - Correct Answer Distance a MWS apparatus travels from the time the brakes are applied until the
MWS apparatus comes to a complete stop.
Centrifugal - Correct Answer Is not self priming
Clearance between impeller hub and housing can be a problem
Compound gauge - Correct Answer Checks the pump intake pressure
Daily inspection - Correct Answer Ensure auxiliary fuel tank is full
Operate pump primer
Inspect auxiliary winterization system.
Direct pumping operation
Nurse tanker operation
Portable water tank operation - Correct Answer 1. MWS apparatuses pump water from their tanks directly into the fire
pump of the attack apparatus.
2. One MWS apparatus parks next to the attack apparatus supplying it with a discharge line
3. MWS apparatuses dump water into independent tanks and the dump site pumper drafts
, Discharge pressure gauge test - Correct Answer Checks accuracy of discharge readings obtained when pump is in
operation
During MWS apparatus service testing, the atmospheric air temperature should be between: - Correct Answer 0
degree F and 100 degree F
During resupply operation which formula is used to determine the pump discharge pressure? - Correct Answer PDP-
Required Intake Pressure+TPL
Engine speed check - Correct 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? - Correct Answer Only
used when an MWS apparatus has no other way of being filled than through a top opening
Flow Meter - Correct 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? - Correct
Answer
Hard suction hoses generally have a diameter of between? - Correct Answer 4 and 6 inches
Hydrant order...least to greatest - Correct Answer Red, Orange, Green, light blue
Identify FIVE requirements for a MWS apparatus that can be found in NFPA 1901 - Correct 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.
2. An MWS apparatus must be equipped with at least one external fill connection connected into the tank that allows
the tank to be filled at a minimum rate of 1000 GPM.
3. The external fill connection should be equipped with a valve, strainer, and a 30 degree elbow.
4.Valves that are three inches or larger must be of the slow closing design.
5. An MWS apparatus must have at least three large tank discharges capable of discharging 90% of the tank volume
at an average of 1000 GPM.
Identify FOUR pre-service test for an MWS apparatus equipped with a fire pump? - Correct Answer Road tests
Independent pump certification tests
hydrostatic tests
purchase acceptance tests
Identify the TWO most important reasons for maintaining good MWS apparatus records. - Correct Answer Keeps
everyone on the team informed about equipment conditions.
Helps determine whether equipment should be repaired/replaced.
Identify three conditions that could cause you to lose control of a MWS apparatus? - Correct Answer Liquid surge
within the water tank
traveling a 50 mph around a turn
wet, icy roadways
Identify THREE critical items that should be included on an MWS apparatus daily inspection checklist. - Correct
Answer apparatus unit identification number
inspected by column
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?? - Correct Answer 16 psi
A major advantage of a positive displacement pump over a centrifugal pump is that it can? - Correct Answer pump
air, making it self priming
A MWS apparatus should be started with all electrical switches in the OFF position in order to: - Correct Answer Start
engine without a load
A single portable water tank works on fires that require? - Correct 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: - Correct 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? - Correct 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: - Correct Answer 10 degrees
As hose diameter increases? - Correct 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? - Correct Answer A dramatic pressure failure of the tank.
Before you drive a MWS apparatus across a bridge you should? - Correct 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? - Correct Answer Maneuvering/positioning
Braking Distance - Correct Answer Distance a MWS apparatus travels from the time the brakes are applied until the
MWS apparatus comes to a complete stop.
Centrifugal - Correct Answer Is not self priming
Clearance between impeller hub and housing can be a problem
Compound gauge - Correct Answer Checks the pump intake pressure
Daily inspection - Correct Answer Ensure auxiliary fuel tank is full
Operate pump primer
Inspect auxiliary winterization system.
Direct pumping operation
Nurse tanker operation
Portable water tank operation - Correct Answer 1. MWS apparatuses pump water from their tanks directly into the fire
pump of the attack apparatus.
2. One MWS apparatus parks next to the attack apparatus supplying it with a discharge line
3. MWS apparatuses dump water into independent tanks and the dump site pumper drafts
, Discharge pressure gauge test - Correct Answer Checks accuracy of discharge readings obtained when pump is in
operation
During MWS apparatus service testing, the atmospheric air temperature should be between: - Correct Answer 0
degree F and 100 degree F
During resupply operation which formula is used to determine the pump discharge pressure? - Correct Answer PDP-
Required Intake Pressure+TPL
Engine speed check - Correct 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? - Correct Answer Only
used when an MWS apparatus has no other way of being filled than through a top opening
Flow Meter - Correct 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? - Correct
Answer
Hard suction hoses generally have a diameter of between? - Correct Answer 4 and 6 inches
Hydrant order...least to greatest - Correct Answer Red, Orange, Green, light blue
Identify FIVE requirements for a MWS apparatus that can be found in NFPA 1901 - Correct 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.
2. An MWS apparatus must be equipped with at least one external fill connection connected into the tank that allows
the tank to be filled at a minimum rate of 1000 GPM.
3. The external fill connection should be equipped with a valve, strainer, and a 30 degree elbow.
4.Valves that are three inches or larger must be of the slow closing design.
5. An MWS apparatus must have at least three large tank discharges capable of discharging 90% of the tank volume
at an average of 1000 GPM.
Identify FOUR pre-service test for an MWS apparatus equipped with a fire pump? - Correct Answer Road tests
Independent pump certification tests
hydrostatic tests
purchase acceptance tests
Identify the TWO most important reasons for maintaining good MWS apparatus records. - Correct Answer Keeps
everyone on the team informed about equipment conditions.
Helps determine whether equipment should be repaired/replaced.
Identify three conditions that could cause you to lose control of a MWS apparatus? - Correct Answer Liquid surge
within the water tank
traveling a 50 mph around a turn
wet, icy roadways
Identify THREE critical items that should be included on an MWS apparatus daily inspection checklist. - Correct
Answer apparatus unit identification number
inspected by column
