Exam (elaborations)
CDC - Mobile Water Supply Exam 2024
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CDC - Mobile Water Supply Exam 2024
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CDC - Mobile Water Supply Exam 2024A column of water 1"x1"x12" high exerts how much psi? - ANSWER-0.434 psi
A column of water 1"x1"x24" high exerts how much psi? - ANSWER-0.868 psi
A hose has a flow rate of 500 gpm with a friction loss of 4 psi. If the flow rate increases
to 1,000gpm, then the friction loss will increase to: - ANSWER-FL= 2^2 x 4
FL= 4 x 4
FL= 16 psi
According to what NFPA, how much water must an apparatus carry to be considered a
MWS or Tender? - ANSWER-NFPA 1901 Standard for Automotive Fire Apparatus,
At least 1,000 gallons.
An important feature of most screw-on intake pressure relief valves is that they: -
ANSWER-They have bleeder valves to vent air when a connected line is being charged.
An MWS apparatus is resupplying 1,000 gpm to a pumper using 50' of 5inch. The
pumper is in a gully 4 feet below the location of the MWS. Show Work for determining
the PDP. - ANSWER-12 psi
As you move around the apparatus, what general problems are you looking for? -
ANSWER-Fluid leaks, dents, low tire pressure, cleanliness, and broken, or missing
equipment.
Bleeder valves allow the driver/operator to do what? - ANSWER-To vent air to the
atmosphere when a dry supply line is being charged.
Discharges are usually equipped with a locking ___ valve. - ANSWER-Ball
Discharges can also be used to cool the pump when no lines are flowing. TorF? -
ANSWER-True
During a resupply operation which formula is used to determine the PDP? - ANSWER-
PDP= Required Intake Pressure + TPL
During Water shuttle operations where is the pumper that is not at the fill site
positioned?
What is this location commonly referred to as? - ANSWER-The second pumper is
located at or near the emergency scene and is used to draft water from the portable
water tanks.
The dump site.
, Each department must choose the size of the tank for its apparatus based on what? -
ANSWER-Local water requirements
Water system limitations
Road conditions
Bridge weight restrictions
Engine compartment: air Filter Restriction Gauge - ANSWER-Check the air filter
restriction gauge to determine if the air filter needs to be changed.
Engine compartment: Air system - ANSWER-Check the air system for leaks in the
system.
Engine compartment: Automatic transmission fluid - ANSWER-Check the transmission
fluid level. perform both a cold and a hot check. Cold ensures there is transmission fluid,
hot ensures the fluid is at the correct level for operation.
Engine compartment: Batteries - ANSWER-Check the terminals for corrosion and clean
in accordance with the manufacturers specifications.
Inspect battery cables for any loose connections
Engine compartment: Coolant Overflow Reservoir - ANSWER-Coolant in the overflow
reservoir should be clean and halfway between max and min level for your apparatus.
Engine compartment: Cooling Fan, Hoses, and Radiator - ANSWER-Check the cooling
fan, hoses, and the radiator for cracks.
Engine compartment: Drive Belts - ANSWER-Check all drive belts for wear and proper
tension. 1/2" to 3/4" deflection at midpoint.
Engine compartment: Engine oil - ANSWER-Check whether engine oil is clean and at
full mark.
Engine compartment: Exhaust System - ANSWER-Check the exhaust system for leaks
and damage.
Engine compartment: Fuel filter - ANSWER-Check fuel filter for fuel/water separation
and leak/damage. Check site glass to ensure that the water has been separated from
the fuel.
Engine compartment: Hydraulic fluid - ANSWER-Check all hydraulic fluid levels and
look for any leaks on engine.
Engine compartment: Leaks - ANSWER-Checks for leaks of any fluids within the engine
compartment, including the fuel lines and their components.
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