Ch.5

Question 1

If all other conditions are the same , friction loss varies directly with the length of the hose or pipe?

Answer 1

First principle of friction loss

Question 2

Fluid pressure is perpendicular to any surface on which it acts ?

Answer 2

First principle of pressure

Question 3

The pressure found in a water distribution system during normal consumption demands is considered the ____?

Answer 3

Normal operating pressure

Question 4

A column of water ____ high exerts pressure of 1 psi at its base?

Answer 4

2.304 feet

Question 5

The pressure of a liquid in an open vessel is proportional to the density of the liquid ?

Answer 5

Fifth principle of pressure

Question 6

The maximum amount of water used in any 1 hr interval over the course of a day?

Answer 6

Peak hourly consumption (PHC)

Question 7

Average amount of water used per day based on total amount of water used in a water distribution system over the period of one year?

Answer 7

Average Daily Consumption (ADC)

Question 8

4 principles to friction loss acronym?

Answer 8

L= length
S= square
I= inversely
P= pressure

Question 9

Fluid pressure at a point in the fluid at rest is the same intensity in all directions ? (Used in hydrostatic testing)

Answer 9

Second principle of pressure

Question 10

1 cubic foot of water weighs?

Answer 10

62.4 lbs

Question 11

The pressure of a liquid in an open vessel is proportional to its depth ?

Answer 11

Fourth principle of pressure

Question 12

Pressure applied to a confined fluid is transmitted equally in all directions?

Answer 12

Third principle of pressure

Question 13

Overall water supply system receives the water from the pumping station and delivers it through your the area served?

Answer 13

Distribution system

Question 14

If all other conditions are the same with friction loss with a 100 foot hose , what is the friction loss on Psi?

Answer 14

10 psi

Question 15

Control valves in public water distribution systems are generally ______ valves ?

Answer 15

Gate valves

Question 16

6 principles of pressure acronym?

Answer 16

P=perpendicular
I=intensity
E=equally
P=proportional
D=density
B=bottom

Question 17

Atmospheric pressure at sea level is _______ , which is considered standard atmospheric pressure?

Answer 17

14.7 psi

Question 18

Water may also be used smoother fires in combustible liquids whose specific gravity is_________?

Answer 18

Higher than 1 (heavier than water )

Question 19

If velocity is increased beyond practical limits, the friction becomes so great that resistance agitates the entire stream and creates____________?

Answer 19

Critical velocity

Question 20

For the same discharge, friction loss varies inversely as the fifth power of the diameter of the hose, this principal readily proves the advantage of larger size hose?

Answer 20

Third principle of friction loss

Question 21

For a given velocity, friction loss is approximately the same, regardless of the pressure on the water. This principle explains why friction loss is the same whenever hoses or pipes a different pressures flow the same amount of water?

Answer 21

Fourth principle of friction loss

Question 22

Refers to the center line of the pump or the bottom of a static water supply source above or below grade level ?

Answer 22

Elevation

Question 23

Atmospheric pressure is _______ at low altitudes and _________ at very high altitudes ?

Answer 23

Greatest (low altitudes)
Least ( high altitudes )

Question 24

When hoses are the same size , friction loss varies approximately with the square of the increase in velocity of the flow , this principle illustrates that friction loss develops much faster than the change in velocity?

Answer 24

Second principle of friction loss

Question 25

The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel?

Answer 25

Sixth principle of pressure

Question 26

While water is flowing from a discharge opening , the forward velocity is considered ?

Answer 26

Flow pressure

Question 27

_____________ is the portion of the total available pressure not used to overcome friction loss or gravity while forcing water through pipes , fittings , hoses and adapters?

Answer 27

Residual pressure

Question 28

Valves in private fire protection systems are usually of the indicating type, two common indicator valves are the_______ and _______?

Answer 28

Post indicator valve (piv) Outside screw and yoke valve (OS&Y )

Question 29

A 1 inch square column of water 1 foot high, therefore exerts a pressure at its base of?

Answer 29

0.434 psi

Question 30

For the same discharge, friction loss varies inversely as the_____________ Of the diameter of the hose, this principle readily proves that advantage of larger size hose?

Answer 30

Fifth power