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Driver Ops > Chapter 5 > Flashcards

Chapter 5 Flashcards

1
Q

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

A

pressure loss.

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2
Q

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

A

2.304

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3
Q

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

A

condition should be reported to the responsible agency.

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4
Q

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

A

Static pressure

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5
Q

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

A

When a fire hydrant receives water from two or more directions

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6
Q

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

A

Sharp bends

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7
Q

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

A

Sharp bends in the hose

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8
Q

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

A

adequacy of the water distribution system.

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9
Q

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

A

Because atmospheric pressure drops as height above sea level increases

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10
Q

Which statement about a gravity system is MOST accurate?

A

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

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11
Q

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

A

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

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12
Q

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

A

primary feeders.

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13
Q

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

A

Nonindicating valves

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14
Q

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

A

independent of the shape of the vessel.

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15
Q

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?

A

Post indicator (PIV) valve

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16
Q

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

A

receives water from only one direction.

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17
Q

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

A

8.3 lb/gal (1 kg/L).

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18
Q

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

A

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

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19
Q

Which is the BEST description of pressure?

A

Force per unit area

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20
Q

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?

A

Residual pressure

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21
Q

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?

A

Direct pumping system

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22
Q

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

A

Normal operating pressure

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23
Q

For water supply, most communities use a:

A

combination of the direct pumping and gravity systems.

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24
Q

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

A

transmitted equally in all directions.

25
Q

The valves within a water distribution system should be:

A

inspected and operated yearly by the water supply utility

26
Q

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

A

Request that water utility department increase water pressure

27
Q

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

A

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

28
Q

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

A

Proportional to the dentisty of the liquid.

29
Q

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

A

Flow pressure

30
Q

Which of the following causes water hammer?

A

Suddenly stopping water moving through a hose or pipe

31
Q

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:

A

secondary feeders.

32
Q

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

A

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

33
Q

Which of the following is a characteristic of water?

A

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

34
Q

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

A

municipal water supply system.

35
Q

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

A

almost always separate.

36
Q

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

A

approximately the same, regardless of pressure on the water.

37
Q

The difference between static pressure and normal operating pressure is:

A

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

38
Q

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

A

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

39
Q

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

A

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

40
Q

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

A

proportional to its depth.

41
Q

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

A

measures must be taken to prevent cross contamination

42
Q

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

A

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

43
Q

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

A

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

44
Q

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

A

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

45
Q

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

A

varies directly with length of hose or pipe.

46
Q

Which of the following refers to absolute zero pressure?

A

Perfect vacuum

47
Q

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

A

the same intensity in all directions

48
Q

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

A

pressure gain.

49
Q

The second principle of friction loss illustrates that:

A

friction loss develops much faster than change in velocity.

50
Q

Friction loss is that part of the total pressure lost:

A

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

51
Q

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

A

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

52
Q

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

A

Generally, it is an inexpensive and readily available commodity.

53
Q

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

A

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

54
Q

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

A

Vacuum

55
Q

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

A

Water is considered to be virtually incompressible.

56
Q

The first principle of pressure states that fluid pressure is:

A

. perpendicular to any surface on which it acts.

57
Q

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

A

Modern fire hose has a smoother inner lining.

58
Q

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

A

Local water authority

Driver Ops (15 decks)

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