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Myths of Water Flow in Firefighting Quiz

If a fire stream is pointed at a wall, and the firefighter advances the line to where the nozzle is within an inch or two of the wall, the nozzle reaction will :

Go Up Go Down Stay the Same
The force required to bend a preconnect (1 3/4 inch hose) into the shape of a "U" at 200 PSI is the same on hose manufactured today as it was for hose manufactured 25 years ago.

True False
If a water stream is aimed at a wall at a 45 degree angle, the water will bounce off the wall at a 45 degree angle, much like a beam of light on a mirror will bounce.

True False

If a straight bore nozzle and a combination nozzle are both flowing the same amount of water at the same amount of nozzle pressure, which of the following is TRUE :

The straight bore will always hit harder at any flow or pressure?
The fog nozzle will hit harder than the straight bore at close range and with equivalent force farther away?
The fog nozzle will always hit harder at any flow or pressure?
They will both hit the same under all circumstances?

AIR in a pump will cause a condition called "cavitation" to occur, and this condition will cause damage to the pump if allowed to continue.

True False
The protective fog from a nozzle with spinning teeth will cause the hot gases and flames to be sucked towards the face of the nozzle.

True False
Rapidly pressing in the throttle of a pumper will possibly cause damage to the driveline of the vehicle.

True False
The stream of a combination nozzle is "hollow" as opposed to the solid stream of a straight bore nozzle.

True False

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