Chapter 7

Question 1

For which of the following is a nozzle pressure of 50 or 75 psi (350 or 525 kPa) a safe and efficient nozzle pressure?

a. Fog nozzle
b. Solid stream nozzle (master stream)
c. Solid stream nozzle (handline)
d. Low pressure fog nozzle

Answer 1

d. Low pressure fog nozzle

Question 2

When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately:

a. 25 percent less than that of a single hoseline at the same nozzle pressure.
b. the same as that of a single hoseline at the same nozzle pressure.
c. 10 percent more than that of a single hoseline at the same nozzle pressure.
d. 50 percent less than that of a single hoseline at the same nozzle pressure.

Answer 2

a. 25 percent less than that of a single hoseline at the same nozzle pressure

Question 3

Which of the following is the primary consideration for friction loss?

a. Volume of water flowing per minute
b. Length of hose lay
c. Experience of firefighters
d. Elevation differences

Answer 3

a. Volume of water flowing per minute