Chap 5 Principles of Water
Which action fire departments should take when a large volume of water is needed in
an area? - answer Request that water utility department increase water pressure
Which statement describes the relationship between pressure and altitude? - answer
Pressure is greatest at low altitudes and least at very high altitudes.
Water is: - answer considered to be virtually incompressible
When a nozzle is below the level of the pump, there is: - answer pressure gain.
Which term refers to stored potential energy available to force water through pipes,
fittings, hose and adapters? - answerStatic pressure
Which term refers to the portion of total available pressure not used to overcome friction
loss or gravity while forcing water through pipes, fittings, hoses, adapters? -
answerResidual pressure
At 212°F (100°C), water converted to steam occupies approximately: - answer1,700
times its original volume.
A dead-end fire hydrant is a fire hydrant that: - answerreceives water from only one
direction.
Which term refers to the pressure found in a water distribution system during normal
consumption demands? - answerNormal operating pressure
Why is friction loss in newer, modern fire hose much less than in older fire hose? -
answerModern fire hose has a smoother inner lining
Which statement about a gravity system is MOST accurate? - answerUses a primary
water source located at a higher elevation than the distribution system
The sixth principle of pressure states that the pressure of a liquid at the bottom of a
vessel is: - answerindependent of the shape of the vessel.
Which term refers to any pressure less than atmospheric pressure? - answerVacuum
Why does altitude impact the production of fire streams? - answerBecause atmospheric
pressure drops as height above sea level increases
, In order to convert head in feet to head pressure in psi, you must divide the number of
feet by: - answer2.304
Which is a characteristic of water? - answerIt has greater heat-absorbing capacity than
other common extinguishing agents.
Which statement about water and electricity is MOST accurate? - answerWater is a
good conductor of electricity
When water converts to steam within a closed space, the fire: - answermay be
extinguished by smothering
If a property is served by both the municipal system and a private source consisting of
nonpotable water: - answermeasures must be taken to prevent cross contamination.
Which type of friction loss can usually be minimized by employing proper hose handling
techniques? - answerSharp bends in the hose
For water supply, most communities use a: - answercombination of the direct pumping
and gravity systems.
The second principle of pressure states that fluid pressure at a point in fluid at rest is: -
answerthe same intensity in all directions
When engineers estimate the amount of water that a large city needs, the: -
answerdomestic/industrial requirements will far exceed that needed for fire protection.
Who should the fire department coordinate with before flushing hydrants in
nonemergency situations? - answerLocal water authority
Which statement about fire hose and friction loss is MOST accurate? - answerThe
smaller the hose, the greater the velocity needed to deliver the same volume
When a nozzle is above the level of the pump, there is: - answerpressure loss
Which term refers to the forward velocity pressure while water is flowing from a
discharge opening? - answerFlow pressure
Which is a cause of friction loss in fire hose? - answerSharp bends
Friction loss is that part of the total pressure lost: - answerwhile forcing water through
pipe, fittings, fire hose, and adapters
Which type of valve has a yoke on the outside with threaded stem that controls the
gate's opening or closing and is most commonly used on sprinkler systems? -
answerOutside screw and yoke (OS&Y) valve
Which action fire departments should take when a large volume of water is needed in
an area? - answer Request that water utility department increase water pressure
Which statement describes the relationship between pressure and altitude? - answer
Pressure is greatest at low altitudes and least at very high altitudes.
Water is: - answer considered to be virtually incompressible
When a nozzle is below the level of the pump, there is: - answer pressure gain.
Which term refers to stored potential energy available to force water through pipes,
fittings, hose and adapters? - answerStatic pressure
Which term refers to the portion of total available pressure not used to overcome friction
loss or gravity while forcing water through pipes, fittings, hoses, adapters? -
answerResidual pressure
At 212°F (100°C), water converted to steam occupies approximately: - answer1,700
times its original volume.
A dead-end fire hydrant is a fire hydrant that: - answerreceives water from only one
direction.
Which term refers to the pressure found in a water distribution system during normal
consumption demands? - answerNormal operating pressure
Why is friction loss in newer, modern fire hose much less than in older fire hose? -
answerModern fire hose has a smoother inner lining
Which statement about a gravity system is MOST accurate? - answerUses a primary
water source located at a higher elevation than the distribution system
The sixth principle of pressure states that the pressure of a liquid at the bottom of a
vessel is: - answerindependent of the shape of the vessel.
Which term refers to any pressure less than atmospheric pressure? - answerVacuum
Why does altitude impact the production of fire streams? - answerBecause atmospheric
pressure drops as height above sea level increases
, In order to convert head in feet to head pressure in psi, you must divide the number of
feet by: - answer2.304
Which is a characteristic of water? - answerIt has greater heat-absorbing capacity than
other common extinguishing agents.
Which statement about water and electricity is MOST accurate? - answerWater is a
good conductor of electricity
When water converts to steam within a closed space, the fire: - answermay be
extinguished by smothering
If a property is served by both the municipal system and a private source consisting of
nonpotable water: - answermeasures must be taken to prevent cross contamination.
Which type of friction loss can usually be minimized by employing proper hose handling
techniques? - answerSharp bends in the hose
For water supply, most communities use a: - answercombination of the direct pumping
and gravity systems.
The second principle of pressure states that fluid pressure at a point in fluid at rest is: -
answerthe same intensity in all directions
When engineers estimate the amount of water that a large city needs, the: -
answerdomestic/industrial requirements will far exceed that needed for fire protection.
Who should the fire department coordinate with before flushing hydrants in
nonemergency situations? - answerLocal water authority
Which statement about fire hose and friction loss is MOST accurate? - answerThe
smaller the hose, the greater the velocity needed to deliver the same volume
When a nozzle is above the level of the pump, there is: - answerpressure loss
Which term refers to the forward velocity pressure while water is flowing from a
discharge opening? - answerFlow pressure
Which is a cause of friction loss in fire hose? - answerSharp bends
Friction loss is that part of the total pressure lost: - answerwhile forcing water through
pipe, fittings, fire hose, and adapters
Which type of valve has a yoke on the outside with threaded stem that controls the
gate's opening or closing and is most commonly used on sprinkler systems? -
answerOutside screw and yoke (OS&Y) valve
