Chapter 7

Question 1

Which of the following statements about pump discharge pressure is MOST accurate?

Answer 1

Pump discharge pressure must be sufficient to overcome all pressure loss.

Question 2

Which of the following BEST describes friction loss for handlline nozzles?

Answer 2

Generally considered to be insignificant

Question 3

The pump discharge pressure should be calculated and set based on:

Answer 3

hoseline with the greatest pressure requirement.

Question 4

When determining pressure loss for elevated waterways, the elevation of the master stream:

Answer 4

must be considered as part of the total pressure loss.

Question 5

Which method of determining friction loss relies on the use of mathematical equations or field application methods?

Answer 5

Using calculations

Question 6

Total pressure loss includes friction loss and elevation pressure loss combined with the loss associated with:

Answer 6

appliances

Question 7

In the formula for friction loss, the “L” refers to:

Answer 7

hose length

Question 8

Which of the following is a friction loss guideline in a hose assembly when flowing 350 gpm (1 400 L/min) or greater?

Answer 8

There is a loss of 10 psi (70 kPa) for each appliance, other than master stream devices.

Question 9

Which method of determining friction loss involves the use of in-line gauges to measure friction loss at various flows through specific hose layouts?

Answer 9

Performing tests

Question 10

Which of the following customary formulas would be used to determine elevation pressure in a multistory building?

Answer 10

5 psi × (number of stories - 1)

Question 11

When a pumper is being supplied by another pumper, net pump discharge pressure is the difference between pump discharge pressure and:

Answer 11

incoming pressure from supply source.

Question 12

Which of the following is the correct formula for Net Pump Discharge Pressure?

Answer 12

Pump Discharge Pressure - Intake Reading

Question 13

To calculate friction loss when using multiple hoselines of unequal length, a driver/operator must:

Answer 13

calculate friction loss for each hoseline supplied by separate discharges to individual nozzles.

Question 14

Which of the following is the correct customary formula for determining pump discharge pressure?

Answer 14

Nozzle pressure plus total pressure loss

Question 15

Which of the following BEST describes friction loss for master stream appliances?

Answer 15

25 psi (175kPa) for all appliances

Question 16

When using multiple hoselines of equal length and diameter, loss calculations:

Answer 16

need only be made for one line.

Question 17

If a jurisdiction is performing tests using equipment they own in order to achieve more accurate results, the testing should be conducted:

Answer 17

using actual hose that will be used during firefighting operations.

Question 18

The current formula for friction loss accounts for the diameter of the hose, the volume of water flowing, and the:

Answer 18

length of the hose layout.

Question 19

Which of the following statements about adding unequal lengths of hose to an established wyed hose layout is MOST accurate?

Answer 19

Friction loss must be determined for each attack line.

Question 20

Which of the following customary formulas would be used to conduct elevation pressure loss calculations on the fireground?

Answer 20

0.5 × Height in feet

Question 21

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

Answer 21

Volume of water flowing per minute GPM

Question 22

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

Answer 22

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

Question 23

The use of standard formulas and field applications for determining friction loss are generally:

Answer 23

relied upon for safe fireground operations.

Question 24

When using multiple hoselines of equal length but different diameter, loss calculations:

Answer 24

must be made for both lines.

Question 25

When determining friction loss in a wyed hoseline in which the hoselines have the same nozzle pressure, hose length, and diameter:

Answer 25

only one of the wyed hoselines need to be considered.