CDC - Mobile Water Supply
Questions with Accurate Answers
A column of water 1"x1"x12" high exerts how much psi? correct answer 0.434 psi
A column of water 1"x1"x24" high exerts how much psi? correct 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: correct 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? correct 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:
correct 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. correct answer 12 psi
,As you move around the apparatus, what general problems are you looking for?
correct answer Fluid leaks, dents, low tire pressure, cleanliness, and broken, or
missing equipment.
Bleeder valves allow the driver/operator to do what? correct answer To vent air
to the atmosphere when a dry supply line is being charged.
Discharges are usually equipped with a locking ___ valve. correct answer Ball
Discharges can also be used to cool the pump when no lines are flowing. TorF?
correct answer True
During a resupply operation which formula is used to determine the PDP? correct
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? correct 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? correct answer Local water requirements
Water system limitations
Road conditions
Bridge weight restrictions
, Engine compartment: air Filter Restriction Gauge correct answer Check the air
filter restriction gauge to determine if the air filter needs to be changed.
Engine compartment: Air system correct answer Check the air system for leaks in
the system.
Engine compartment: Automatic transmission fluid correct 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 correct 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 correct 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 correct answer Check the
cooling fan, hoses, and the radiator for cracks.
Engine compartment: Drive Belts correct answer Check all drive belts for wear
and proper tension. 1/2" to 3/4" deflection at midpoint.
Engine compartment: Engine oil correct answer Check whether engine oil is clean
and at full mark.
Questions with Accurate Answers
A column of water 1"x1"x12" high exerts how much psi? correct answer 0.434 psi
A column of water 1"x1"x24" high exerts how much psi? correct 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: correct 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? correct 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:
correct 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. correct answer 12 psi
,As you move around the apparatus, what general problems are you looking for?
correct answer Fluid leaks, dents, low tire pressure, cleanliness, and broken, or
missing equipment.
Bleeder valves allow the driver/operator to do what? correct answer To vent air
to the atmosphere when a dry supply line is being charged.
Discharges are usually equipped with a locking ___ valve. correct answer Ball
Discharges can also be used to cool the pump when no lines are flowing. TorF?
correct answer True
During a resupply operation which formula is used to determine the PDP? correct
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? correct 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? correct answer Local water requirements
Water system limitations
Road conditions
Bridge weight restrictions
, Engine compartment: air Filter Restriction Gauge correct answer Check the air
filter restriction gauge to determine if the air filter needs to be changed.
Engine compartment: Air system correct answer Check the air system for leaks in
the system.
Engine compartment: Automatic transmission fluid correct 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 correct 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 correct 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 correct answer Check the
cooling fan, hoses, and the radiator for cracks.
Engine compartment: Drive Belts correct answer Check all drive belts for wear
and proper tension. 1/2" to 3/4" deflection at midpoint.
Engine compartment: Engine oil correct answer Check whether engine oil is clean
and at full mark.
