Chapter 5

Question 1

When a nozzle is above the level of the pump, there is:

Answer 1

pressure loss.

Question 2

In order to convert head in feet to head pressure in psi, you must divide the number of feet by

Answer 2

2.304

Question 3

If a gate valve resists turning after fewer than the indicated number of turns required to close the valve, the:

Answer 3

condition should be reported to the responsible agency.

Question 4

Which of the following refers to stored potential energy available to force water through pipes, fittings, hose and adapters?

Answer 4

Static pressure

Question 5

Which of the following refers to a circulating feed or looped line?

Answer 5

When a fire hydrant receives water from two or more directions

Question 6

Which of the following is MOST likely a cause of friction loss in fire hose

Answer 6

Sharp bends

Question 7

Which type of friction loss can usually be minimized by employing proper hose handling techniques?

Answer 7

Sharp bends in the hose

Question 8

Rates of consumption allow engineers and fire protection personnel to determine:

Answer 8

adequacy of the water distribution system.

Question 9

Which of the following BEST describes why altitude impacts the production of fire streams?

Answer 9

Because atmospheric pressure drops as height above sea level increases

Question 10

Which statement about a gravity system is MOST accurate?

Answer 10

Uses a primary water source located at a higher elevation than the distribution system

Question 11

When water converts to a gas, water vapor, or steam, the water:

Answer 11

only becomes visible as it rises away from the surface of the liquid and begins to condense.

Question 12

In a grid system, large pipes (mains), with relatively widespread spacing, that convey large quantities of water to various points of the system for local distribution to smaller mains are called

Answer 12

primary feeders.

Question 13

Which are the most common type of valves used on most public water distribution systems?

Answer 13

Nonindicating valves

Question 14

The 6th principle of pressure states that the pressure of a liquid at the bottom of a vessel is:

Answer 14

independent of the shape of the vessel.

Question 15

Which type of valve is commonly used on private water supply systems and the words open or shut appear in a window as the valve approaches one position or the other?

Answer 15

Post indicator (PIV) valve

Question 16

A dead-end fire hydrant is a fire hydrant that:

Answer 16

receives water from only one direction.

Question 17

For fire protection purposes, ordinary fresh water is considered to weigh:

Answer 17

8.3 lb/gal (1 kg/L).

Question 18

Water may be used to smother fires in a combustible liquid:

Answer 18

when the liquid’s specific gravity is higher than 1.

Question 19

Which is the BEST description of pressure?

Answer 19

Force per unit area

Question 20

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

Answer 20

Residual pressure

Question 21

Which means of moving water uses one or more pumps that take water from a primary source and discharge it through filtration and treatment processes?

Answer 21

Direct pumping system

Question 22

Which of the following refers to the pressure found in a water distribution system during normal consumption demands?

Answer 22

Normal operating pressure

Question 23

For water supply, most communities use a:

Answer 23

combination of the direct pumping and gravity systems.

Question 24

The third principle of pressure states that pressure applied to a confined fluid is

Answer 24

transmitted equally in all directions.

Question 25

The valves within a water distribution system should be:

Answer 25

inspected and operated yearly by the water supply utility

Question 26

Which of the following is an action that fire departments should take when a large volume of water is needed in an area?

Answer 26

Request that water utility department increase water pressure

Question 27

When engineers estimate the amount of water that a large city needs, the:

Answer 27

domestic/industrial requirements will far exceed that needed for fire protection.

Question 28

The fifth principle of pressure states that the pressure of a liquid in an open vessel is:

Answer 28

Proportional to the dentisty of the liquid.

Question 29

Which of the following refers to the forward velocity pressure while water is flowing from a discharge opening?

Answer 29

Flow pressure

Question 30

Which of the following causes water hammer?

Answer 30

Suddenly stopping water moving through a hose or pipe

Question 31

In a grid system, a network of intermediate-sized pipes that reinforce the grid and aid the concentration of required fire flow at any point are called:

Answer 31

secondary feeders.

Question 32

A characteristic of water as an extinguishing agent is that it:

Answer 32

has a high surface tension that makes it somewhat difficult to soak into dense materials

Question 33

Which of the following is a characteristic of water?

Answer 33

It has greater heat-absorbing capacity than other common extinguishing agents.

Question 34

Most commonly, private water supply systems receive their water from a(an):

Answer 34

municipal water supply system.

Question 35

The piping for fire protection and domestic/industrial services for private water supply systems are:

Answer 35

almost always separate.

Question 36

The fourth principle of friction loss states that for a given velocity, friction loss is

Answer 36

approximately the same, regardless of pressure on the water.

Question 37

The difference between static pressure and normal operating pressure is:

Answer 37

the friction caused by water flowing through the pipes, valves and fittings.

Question 38

Which is an advantage to having separate piping arrangements for a private water supply system?

Answer 38

Neither of the systems is affected by service interruptions to the other

Question 39

Which of the following is the MAIN concern of fire departments regarding water treatment facilities?

Answer 39

Maintenance failure or other events could disable pumping station(s) or severely hamper the purification process

Question 40

The fourth principle of pressure states that the pressure of a liquid in an open vessel is

Answer 40

proportional to its depth.

Question 41

If a property is served by both the municipal system and a private source consisting of nonpotable water:

Answer 41

measures must be taken to prevent cross contamination

Question 42

Which of the following statements about atmospheric pressure is the MOST accurate?

Answer 42

Pressure is greatest at low altitudes and least at very high altitudes

Question 43

Why does the third principle of friction loss demonstrate the advantage of larger size hose?

Answer 43

For the same discharge, friction loss varies inversely as the fifth power of diameter of hose.

Question 44

Which of the following statements about fire hose and friction loss is MOST accurate?

Answer 44

The smaller the hose, the greater the velocity needed to deliver the same volume.

Question 45

The first principle of friction loss states that if all other conditions are the same, friction loss:

Answer 45

varies directly with length of hose or pipe.

Question 46

Which of the following refers to absolute zero pressure?

Answer 46

Perfect vacuum

Question 47

The second principle of pressure states that fluid pressure at a point in fluid at rest is:

Answer 47

the same intensity in all directions

Question 48

When a nozzle is below the level of the pump, there is:

Answer 48

pressure gain.

Question 49

The second principle of friction loss illustrates that:

Answer 49

friction loss develops much faster than change in velocity.

Question 50

Friction loss is that part of the total pressure lost:

Answer 50

while forcing water through pipe, fittings, fire hose, and adapters.

Question 51

Which of the following statements about friction loss is MOST accurate?

Answer 51

Friction loss in a water system increases as length of hose or piping increases

Question 52

Which of the following statements about water as an extinguishing agent is MOST accurate?

Answer 52

Generally, it is an inexpensive and readily available commodity.

Question 53

Which of the following statements about water curtains is MOST accurate?

Answer 53

Radiant heat easily passes through water, rendering water curtains ineffective.

Question 54

Which of the following refers to any pressure less than atmospheric pressure?

Answer 54

Vacuum

Question 55

Which of the following statements about properties of water is MOST accurate?

Answer 55

Water is considered to be virtually incompressible.

Question 56

The first principle of pressure states that fluid pressure is:

Answer 56

. perpendicular to any surface on which it acts.

Question 57

Why is friction loss in newer, modern fire hose much less than in older fire hose?

Answer 57

Modern fire hose has a smoother inner lining.

Question 58

Who should the fire department coordinate with before flushing hydrants in nonemergency situations?

Answer 58

Local water authority