Chapter II Flashcards
What is the type of pressure called when pumping down the hill
- forward pressure
According to John Freeman how large of a circle should 3/4 of a solid stream past through at its breakover point
- 10”
It has been estimated that the momentary nozzle reaction is about ____ higher than the nozzle reaction from the flowing stream
- 20%
Which of the following people conducted experiments designed to define what characterizes a good solid stream
- John R Freeman
Most fire departments calculate the friction loss for the hoses and nozzles that they carry and write them down on what is called a_________.
- pump chart
What is the most widely used formulas for determining friction loss in a 2 1/2” hose line
- Underwriters formula
An important thing to remember when figuring friction loss for a combination layout is that hose lines of the same size _____.
- only need to be figured and added once
When using the coefficient formula to find the friction loss what is the conversion factor for 3” hose
- .80
When changing from a 1 1/2” hose to a 2 1/2” hose, there is ____times less friction loss
- 13
In the fire service, friction loss is defined as a loss of __________, whenever water runs through hoses, fittings, and appliances
- energy, in pressure
Which of the following formulas was a result of tests conducted by E. M. Byington of the Boston Fire Department
- Nozzle reaction
If keeping the flow the same, as a hose size is doubled the friction loss is only _______ times the friction loss in the smaller hose
- 1/32
