Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

DPO > DPO > Flashcards

DPO Flashcards

1
Q

Finish Mechanical Foam is a….

A

Completed product after air is introduced in the solution and leaves the nozzle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The purpose of the check valve in a fire department connection is to prevent…

A

Water from a sprinkler system from flowing back

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Pump discharge pressures should not exceed ___psi unless the standpipe system has been designed to withstand higher pressures

A

185psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which type of fire pumps must be primed using an external priming device?

A

Centrifugal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Once the power take-off has been properly activated and the pump is engaged, the vehicle speedometer should show a speed of….

A

Slightly above 0 mph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A___distribution system is a network of water mains which provides circulating feed

A

Grid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Using the coefficient method, determine the pressure loss due to friction in the hose assembly

A

86.5 psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Fire gels work by….

A

Entrapping water instead of air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

A hydrant with the largest capacity will be one that is connected to a …..

A

Primary feeder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

One method of calculating the capacity of a water shuttle operation in gpm is…..

A

Travel time divided by the required flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The amount of work that a pump must do to produce a fire stream is the _____pressure

A

Pump Discharge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

If a fire department connection is found inoperable, the best way to bypass it so operations can be performed is….

A

Stretch a medium size diameter supply line into the building and connect it to the standpipe hose outlet on the first floor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

A dual pumping operation is…..

A

Placing one pumper at a hydrant and a second pumper connected intake to intake

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Water flowing through hoses and appliances results in….

A

Friction Loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Water temperature greater than 90 degrees F can cause _____in the fire pump

A

Decreased capacity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In a _______hydrant, a small drain valve opens as the hydrant is closed

A

Dry barrel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

A piercing nozzle would be used on……

A

An attic fire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In-line relay valves allow for…..

A

Late arriving pumpers to hook up without interrupting operations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

TO prevent water hammer, it is important to close nozzles, hydrants, valves, and hose clamps……

A

Slowly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

An operator should prime a pump when operating…..

A

From a static source

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

When performing a capacity test, the desired net pump pressure should be _____psi

A

150 psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

The process that causes foam concentrate to move through an in-line foam eductor and into the water stream is the _____principle

A

Venturi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

A _____depends on an external water source to provide the water

A

Dry Standpipe System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

You should switch from pressure to volume when…..

A

More than half of the rated capacity of the pump will be required.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Compressed air form systems result in…..

A

Greater reach of fire stream

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

The selection of a proportioner depends on…..

A

Required ratio of foam and length and size of the attack line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

The flow from a 1-inch nozzle tip with nozzle pressure of 50 psi is approximately ____gpm

A

210 gpm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

To reduce carcinogen exposure after a fire, you should…..

A

Transport contaminated gear way from passenger compartments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

All gauges used for service tests must have been calibrated within _____days

A

60

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Pump discharge pressure is equal to…..

A

NP + TPL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

_____ is a force-per-unit area with the measurements of force in pounds and the measurement of area in square inches

A

Pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Relay Operations should be shut down from the _____first

A

Attack pumper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Discharge manifolds may be used in relay operations to ……

A

Support more than one attack pumper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

The pressure remaining once water has begun flowing is ______ pressure

A

Residual

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Which is a fire hose appliance carried on a fire apparatus

A

Gated wye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

The 50 percent pump capacity test is conducted at a net pump pressure of…..

A

250 psi for 10 minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

Which valve determines whether the pump is operating in series or pressure mode

A

Transfer valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Which foam has a surfactant added that it makes more fluid

A

Fluoroprotien

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

One way to increase the efficiency of water shuttle operations is to ….

A

Decrease the time required to fill the tender

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

An increase in vacuum while drafting indicates a……

A

Clogged strainer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

During a water shuttle operation requiring two pumpers, the pumper located near the emergency scene is the…..

A

Dump site pumper

42
Q

The recommended nozzle pressure for smooth bore master streams is _____psi

A

80

43
Q

A common reason for eductor failure is……

A

Improper cleaning and maintenance

44
Q

When pumping from a tank and attack lines are being used intermittently, which is a way the pump operator can ensure the pump does not overheat

A

Set the circulator valve to tank position

45
Q

When positioning a pumper to supply a fire department connection, the apparatus operator must consider the……

A

Positioning requirements of the other apparatus

46
Q

Which type of pump may be used as the priming pump of a centrifugal pump?

A

Rotary vane

47
Q

While transferring water from one dump tank to another, which method is most effective?

A

Jet siphon

48
Q

An operator obtains a reading of 17 inches of mercury on the intake gauge while drafting and flowing water. This indicates….

A

A lift of approximately 19 feet

49
Q

Theoretically, the maximum distance a pump can lift water at sea level is _____ feet

A

33.9

50
Q

High energy foam systems introduce…..

A

Compressed air into the foam solution prior to discharge into the hose line

51
Q

The recommended nozzle pressure of 2 1/2” hand lines with solid bore tips is ____ psi

A

50

52
Q

Hose that is laid from the fire to the hydrant is considered a ……

A

Reverse lay

53
Q

Discharge manifolds may be used in relay operations to……

A

Support more than one attack pumper

54
Q

Available flow from hydrants is estimated by determining the percent drop between the static and _____pressures

A

Residual

55
Q

Fire pumpers must carry one straight ladder, one extension ladder, and…….

A

An attic ladder

56
Q

Nozzle reaction is explained by the law of physics that states…..

A

For every action there is an equal and opposite reaction

57
Q

For drafting purposes, lift is measured from the….

A

Surface of the water to the pump intake

58
Q

Which statement about foam is true

A

IT works by separating, cooling, or suppressing

59
Q

A 2,000 gallon tender makes the round trip between the dump site and fill site in 12 minutes. The flow rating for that tender is ______ gpm

A

150

60
Q

A relief valve by-passes excess water from the discharge side of the pump to the____

A

Pump intake

61
Q

The residual pressure reading at the intake gauge in a relay pumping operation should stay above ____psi to prevent damage to the pump

A

20

62
Q

A _____ indicates flow in gallons per minute

A

Flow meter

63
Q

What is the approximate pump discharge pressure necessary to deliver 600gpm through a fog nozzle on deck gun using (3) 2 1/2” lines? The lines are 400’ long and the deck gun is elevated 20 feet above the pumper (Deck gun FL= 10 psi)

A

150

64
Q

When color coding fire hydrants, what color will the bonnet be on a hydrant rate to flow 750 gpm

A

Orange

65
Q

_____ pressure is the difference between the pump discharge pressure and the incoming pressure from the hydrant

A

Net pump discharge

66
Q

When a pumper is supplying four lines of 2 1/2” hose, each equipped with a 250gpm fog nozzle at 100 psi and each 300 feet long, what is the discharge pressure

A

138psi

67
Q

A distributor nozzle could be used on

A

An attic fire

68
Q

When using foam to extinguish a fire, the suppressing method

A

Prevents the release of flammable vapors

69
Q

The minimum depth of water required to pull a draft using a barrel strainer is

A

4 feet

70
Q

Which is a fire hose appliance carried on a pumper?

A

Gated Wye

71
Q

What would be a common problem when looking at a static water source for drafting?

A

Accessibility

72
Q

The friction loss in 300’ of 3” fire hose with 2 1/2” couplings flowing 500 gpm is approximately

A

60 psi

73
Q

When priming a pump, it is necessary to….

A

Make the pump as air tight as possible

74
Q

____ consist of a return water line connected from the discharge side of the pump back tot he intake side of the pump

A

Around the pump proportioners

75
Q

What is the flow from a 2” nozzle with ideal nozzle pressure? (gpm=29.7 x d2 x sq rt NP)

A

1063gpm

76
Q

The actual maximum height to which water will be lifted when the intake gauge reads 9” of mercury is ______ feet

A

10.17

77
Q

Which is a feature of a wet barrel hydrant

A

Does not require draining after use

78
Q

The spiral chamber of a centrifugal pump in which the velocity given to water by the impeller is converted into pressure is the……

A

Volute

79
Q

The kinds of liquids that are lighter than water are those with a specific gravity

A

Less than 1

80
Q

What is the friction loss in 300” of 2 1/2” rubber lined hose flowing 350 gpm

A

74 psi

81
Q

Using the hand method, determine the pumps discharge pressure required to supply the hose assembly…..

A

150 psi

82
Q

______ are controlled by monitoring the water flow and controlling the speed of a positive displacement foam concentrate pump

A

Variable-flow, variable-rate direct injection systems

83
Q

The theoretical lift for a pump at sea level is _____feet

A

33.9

84
Q

Using an in-line eductor, the back pressure must not exceed _______ pressure

A

70% of the inlet

85
Q

In relay pumping operations, the ______should be positioned nearest the water source

A

Largest capacity pumper

86
Q

The total friction loss in 500’ of 3” hose with 2 1/2” couplings with 300 gpm flowing is approx

A

36 psi

87
Q

When calculating the time for a shuttle operation, timing starts when the

A

Dump valve is opened on the tanker

88
Q

In a water distribution grid, the _____supplies individual hydrants

A

Distributor

89
Q

Each fire pump impeller in a housing is a

A

Stage

90
Q

The collapse zone of a building should be ______ the structure

A

One and a half times the height

91
Q

The recommended pressure for standard fog nozzles is

A

100 psi

92
Q

During an extended period of pumping, a gradual increase in engine temperature is noted. A step to reduce this condition would be

A

Open aux cooler

93
Q

When using foam to extinguish a fire, the cooling method

A

REduces the temperature of the fuel and adjacent surfaces

94
Q

If the friction loss is 300 feet of hose at 70 psi, what will the friction loss be in 650 feet of the same size hose flowing the same amount of water?

A

105 psi

95
Q

Centrifugal fire pumps may make use of

A

Positive intake pressures

96
Q

PDP is equal to

A

NP + FL

97
Q

Pressure control devices must operate within _____ with an increase of 30 psi

A

3-10 seconds

98
Q

Which primer utilizes the venturi principle

A

Exhaust primer

99
Q

Apparatus equipped with water tanks larger than 500 gallons must provide a tank-to-pump flow rate of ______ gpm

A

500

100
Q

What is a characteristic of dry hydrants

A

Found near lakes or rivers

DPO (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions