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Driver Operator Mobile Water Supply Exam
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Driver Operator Mobile Water Supply Exam
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Driver Operator Mobile Water Supply ExamA 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.
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 - 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.
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