Why is it necessary to know the amount of friction and pressure loss in the fire hose?

A. To produce effective fire streams.

B. To mimimize wear and tear on fire hose.

C. To ensure correct choice of nozzle size and shape.

D. To control the amount of water flowing from a hydrant.

A. To produce effective fire streams. (184)

Which of the following is NOT a cause of friction loss?

A. Hose condition.

B. Hydrant condition.

C. Coupling condition.

D. Volume of water flowing per minute.

B. Hydrant condition. (184)

The calculation of friction loss must take into account the:

A. Length and diameter of the hoseline.

B. Size of pump on the fire apparatus.

C. Temperature of the water as it leaves the hydrant.

D. Elevation differences between the nozzle and the pump.

A. Length and diameter of the hoseline. (184)

Together, friction loss and elevation pressure loss are referred to as:

A. Total pressure loss.

B. Entire pressure loss.

C. Friction pressure loss.

D. Elevation friction loss.

A. Total pressure loss. (184)

Which two methods are used to determine friction loss:

A. Field tests and calculations.

B. Conversion methods and field tests.

C. Field tests and manufacturer's guidlines.

D. Calculations and manufacturer's guidlines.

A. Field tests and calculations. (185)

Which of the following is the equation for determining friction loss?

A. 0.5H

B. CQ2L

C. 29.7 x D2

D. Flow rate (gpm) / 100

B. CQ2L (185)

If 500 GPM is flowing from a nozzle, what is the total pressure loss due to friction for 200' of 2.5" hose?

A. 25 psi

B. 50 psi

C. 100 psi

D. 150 psi

C. 100 psi (186)

When determining your own friction loss coefficients, in order to get results indicative of averages that can be expected on the fireground, it is necessary to test:

A. Brand-new hose that has never been used.

B. Older hose that has been taken out of service.

C. The same hose that would be used on th fireground.

D. Any size and/or type of hose that is readily available.

C. The same hose that would be used on th fireground. (187)

When determining friction loss coefficients, departments should test:

A. Only one type of hose at a time.

B. No more than two hoses at a time.

C. No more than three hoses at a time.

D. As many hoses as need to be tested at one time.

A. Only one type of hose at a time. (187)

If testing 50-foot lengths of hose, lay out:

A. 200' of hose.

B. 300' of hose.

C. 400' of hose.

D. 500' of hose.

B. 300' of hose. (187)

If using a pitot tube to determine the nozzle pressure and corresponding flow of water, use:

A. Any nozzle.

B. A fog nozzle.

C. A smoothbore nozzle.

D. A staight stream nozzle.

C. A smoothbore nozzle. (187)

If using a flowmeter to detemine the nozzle pressure and corresponding flow of water, use:

A. Any nozzle.

B. A fog nozzle.

C. A smoothbore nozzle.

D. A straight stream nozzle.

A. Any nozzle. (187)

When testing hose, insert gauge one in the hoseline at the connection between the first and second sections of hose away from the discharge. Insert gauge two:

A. 50' from gauge one.

B. 100' from gauge one.

C. 200' from gauge one.

D. 300' from gauge one.

C. 200' from gauge one. (188)

How many test runs should be made for each size hose?

A. Only one.

B. At least two.

C. Three to four.

D. Five to six.

C. Three to four. (188)

Appliance friction loss is insignificant in cases where the total flow through these appliances is less than:

A. 250 gpm.

B. 350 gpm.

C. 150 gpm.

D. 550 gpm.

B. 350 gpm. (188)

Assume a ___ loss for each appliance in a hose assembly when flowing 350 gpm or more.

A. 0 psi.

B. 10 psi.

C. 20 psi.

D. 30 psi.

B. 10 psi. (189)

Assume a friction loss of ___ in all master stream appliances, regardless of the flow.

A. 0 psi.

B. 5 psi.

C. 15 psi.

D. 25 psi.

D. 25 psi. (189)

Elevation pressure is created by elevation differences between:

A. The hose and the pump.

B. The nozzle and the hose.

C. The nozzle and the pump.

D. The hose and the hydrant.

C. The nozzle and the pump. (190)

Water exerts a pressure of ___ per foot of elevation.

A. 0.343

B. 0.416

C. 0.434

D. 0.614

C. 0.434 (191)

Which of the following is the equation for determining elevation pressure?

A. 0.5H

B. CQ2L

C. 29.7 x D2

D. Flow rate (gpm) / 100

A. 0.5H (191)

Which of the following is a way to determine elevation pressure is a multistoried building?

A. 5 psi x (number of stories - 1)

B. 5 psi x (number of stories -2)

C. 10 psi x (number of stories - 1)

D. 10 psi x (number of stories - 2)

A. 5 psi x (number of stories - 1) (191)

Calculate the total pressure loss due to elevation for a hoseline operating at the top of a 150' hill.

A. 25 psi

B. 50 psi

C. 75 psi

D. 100 psi

C. 75 psi (191)

A hoseline operating on a twelth-floor structure fire is connected to the building's standpipe system. What is the total pressure loss due to elevation?

A. 45 psi

B. 55 psi

C. 65 psi

D. 75 psi

B. 55 psi (191)

Which of the following is the most commonly used hose lay?

A. Single hoseline

B. Multiple hoselines (equal length)

C. Siamesed hoselines (unequal length)

D. Wyed hoselines (equal length)

A. Single hoseline (194)

A pumper is supplying a 350-foot hoseline with 150 gpm flowing. The hoseline is composed of 200 feet of 3-inch hose with 3-inch couplings reduced to 150 feet of 2.5-inch hose. What is the pressure loss due to friction in the hose assembly?

A. 3 psi

B. 6 psi

C. 6.75 psi

D. 9.75 psi

D. 9.75 psi (194)

When determining the loss in equal length multiple lines whose diameters are the same, it is necessary to perform calculations for:

A. Each line.

B. Only one line.

C. The line closest to the pump.

D. The line furthest from the pump.

B. Only one line. (195)

When the diameters of hoselines vary, friction loss calculations must be made for each hoseline, and the set for:

A. The highest pressure.

B. The lowest pressure.

C. The pressure of the smallest hose.

D. The pressure of the largest hose.

A. The highest pressure. (195)

When using a wye, it is important that the attack lines wyed from the supply line are:

A. The same length and diameter.

B. Different lengths and diameters.

C. Different lengths but the same diameter.

C. The same length but different diameters.

A. The same length and diameter. (196)

Determine the pressure lost due to friction in a hose assembly in which two 3-inch hoses with 2.5-inch couplings, each 500 feet long, are used to supply a siamese to which 250 feet of 1.5-inch hose is attached. The nozzle on the attack line is flowing 150 gpm.

A. 135 psi

B. 135.25 psi

C. 137.25 psi

D. 145 psi

C. 137.25 psi (197-198)

In most cases, fire departments have perdetermined pressures for:

A. Manifold hoselines.

B. Standpipe operations.

C. Wyed hoselines (unequal length).

D. Multiple hoselines (equal length).

B. Standpipe operations. (199)

The pump discharge pressure at the apparatus must be enough to overcome:

A. Friction loss.

B. Nozzle pressure.

C. Elevation pressure loss.

D. The sum of all pressure losses.

D. The sum of all pressure losses. (209)

Which of the following is the equation for determining pump discharge pressure?

A. PDP = NP - TPL

B. PDP = NP + TPL

C. PDP = NP x TPL

D. PDP = NP / TPL

B. PDP = NP + TPL (209)

To ensure required nozzle pressure, it is SOP in many departments for the DO to initially charge attack kines equipped with fog nozzles at ___ psi and those epuipped with solid stream nozzles at ___ psi pump discharge pressure while setting up for the pump operation.

A. 50; 100

B. 50; 200

C. 100; 50

D. 100; 200

C. 100; 50 (209)

When a pumper is being supplied by a hydrant or a supply line from another pumper, the net pump discharge pressure is the difference between:

A. Friction loss and elevation pressure loss.

B. Total pressure loss and elevation pressure loss.

C. The pump discharge pressure and total pressure loss.

D. The pump discharge pressure and the incoming pressure from the hydrant.

D. The pump discharge pressure and the incoming pressure from the hydrant. (212-213)

Which of the following is he equation for determining net pump discharge pressure?

A. PDP - Intake reading.

B. PDP + Intake reading.

C. PDP x Intake reading.

D. PDP / Intake reading.

A. PDP - Intake reading. (213)

T/F: Elevation differences creat a pressure loss or gain known as elevation pressure.

True (184)

False: Most accurate method is hands-on field testing. (185)

T/F: Assume a 0 psi loss because of hoseline appliances for flows less than 350 gpm.

True: (189)

T/F: Friction loss caused by handline nozzles is usually insignificant in the overall pressure loss in a hose assembly.

True (189)

T/F: When a nozzle is operating at an elevation higher than the apparatus, pressure is exerted back against the pump, creating a pressure "gain".

False: Nozzle at higher elevation than pump creates pressure "loss". (191)

T/F: Hose layouts can be divided into two basic catagories: simple hose layouts and complex hose layouts.

True (194)

T/F: Siamesed hoselines of equal length present the simplest friction loss calculations.

False: Single hoselines present the simplest friction loss calculations. (194)

T/F: In order to determine the amount of friction loss in siamesed hoselines, it is easiest to use the standard friction loss equation, but with a different set of coefficients.

True (198)

T/F: It is not usually necessary to calculate the friction loss is a standpipe because it has little effect on the end result.

True (200)

T/F: For multiple hoselines of unequal length, friction loss must only be calculated in the longest length of hoseline.

False: For multiple hoselines of unequal length, friction loss must be calculated in each hoseline. (201)