Chapter 12 Questions with
Accurate Answers
Apparatus equipped with pressure governors should be set in: correct answer
pressure mode when acting as the attack pumper and rpm mode while working as
a relay pumper.
As a relay pumper, it is advisable for driver/operators to maintain an intake
pressure of: correct answer 20 to 30 psi
Attack pumpers equipped with an adjustable intake relief valve should be set:
correct answer between 50 and 75 psi (350 and 525 kPa) to establish a stable
operating condition.
Centrifugal pumps are rated to pump at their maximum volume capacity at _____
at draft. correct answer 150 psi
In a relay operation, which pumper receives water from the source pumper,
raises the pressure, and supplies water to the next apparatus? correct answer
Relay pumper
In a relay operation, which should be the pumper with the largest pumping
capacity? correct answer Water supply pumper
In relay operations, elevation pressure: correct answer is less than simple friction
loss when water must be pumped uphill.
, Loss of prime or overheating of the pump is MOST likely the result of: correct
answer failure to keep water moving through the pump when using a static water
supply.
Many screw-on intake pressure relief valves are also equipped with a gate valve
that allows the: correct answer water supply to the pump to be shut off.
Placing additional pumpers in the system will increase flow during a relay
operation because it shortens the length of hose each pumper must supply and
allows pumpers to: correct answer operate at lower pressures and maximum
flows within the relay operation.
Pressure relief valves reduce the possibility of damage to the pump and other
water supply components that may be caused by water hammer when valves are
operated too quickly or: correct answer intake pressures rise dramatically.
Putting a relay into operation begins with: correct answer the largest capacity
pumper working from the water source.
The distance of the relay is an important operational consideration because the
longer the hose lay, the correct answer more friction loss will be encountered.
The driver/operator of the attack pumper should not attempt to correct minor
fluctuations as long as the intake pressure: correct answer does not drop below
20 psi
The factor that MOST determines the need for relay operations is: correct answer
the distance between the incident scene and the water source.
Accurate Answers
Apparatus equipped with pressure governors should be set in: correct answer
pressure mode when acting as the attack pumper and rpm mode while working as
a relay pumper.
As a relay pumper, it is advisable for driver/operators to maintain an intake
pressure of: correct answer 20 to 30 psi
Attack pumpers equipped with an adjustable intake relief valve should be set:
correct answer between 50 and 75 psi (350 and 525 kPa) to establish a stable
operating condition.
Centrifugal pumps are rated to pump at their maximum volume capacity at _____
at draft. correct answer 150 psi
In a relay operation, which pumper receives water from the source pumper,
raises the pressure, and supplies water to the next apparatus? correct answer
Relay pumper
In a relay operation, which should be the pumper with the largest pumping
capacity? correct answer Water supply pumper
In relay operations, elevation pressure: correct answer is less than simple friction
loss when water must be pumped uphill.
, Loss of prime or overheating of the pump is MOST likely the result of: correct
answer failure to keep water moving through the pump when using a static water
supply.
Many screw-on intake pressure relief valves are also equipped with a gate valve
that allows the: correct answer water supply to the pump to be shut off.
Placing additional pumpers in the system will increase flow during a relay
operation because it shortens the length of hose each pumper must supply and
allows pumpers to: correct answer operate at lower pressures and maximum
flows within the relay operation.
Pressure relief valves reduce the possibility of damage to the pump and other
water supply components that may be caused by water hammer when valves are
operated too quickly or: correct answer intake pressures rise dramatically.
Putting a relay into operation begins with: correct answer the largest capacity
pumper working from the water source.
The distance of the relay is an important operational consideration because the
longer the hose lay, the correct answer more friction loss will be encountered.
The driver/operator of the attack pumper should not attempt to correct minor
fluctuations as long as the intake pressure: correct answer does not drop below
20 psi
The factor that MOST determines the need for relay operations is: correct answer
the distance between the incident scene and the water source.
