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Driver Ops > Chapter 10 > Flashcards

Chapter 10 Flashcards

1
Q

What should be done first when preparing to shut down a drafting operation

A

Slowly decrease engine speed to idle

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2
Q

Describes when the driver/operator is ready to operate the pump to generate sufficient pressure to create an effective fire stream?

A

When the fire pump has been made operational

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3
Q

During pumping operations, driver/operators should maintain a residual pressure on the master intake gauge

A

of at least 20 psi (140 kPa)

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4
Q

When supporting standpipe operations, fire attack crews should:

A

bring attack lines to initiate standpipe operations.

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5
Q

When shutting down a drafting operation, why should the positive displacement primer be operated for several seconds until primer oil or fluid comes out of discharge from the priming pump?

A

Aids in lubrication of priming pump

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6
Q

BEST describes when occupancies with automatic sprinkler systems should be identified?

A

During preincident planning

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7
Q

The water supply from an onboard water tank is:

A

the sole source of supply for many incidents.

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8
Q

During drafting operations, the ability to overcome losses in pressure is:

A

limited to atmospheric pressure at sea level.

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9
Q

The automatic water supply for a sprinkler system is designed to supply

A

only a fraction of total fire sprinklers at any given time.

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10
Q

Most apparatus are designed so that the procedure for making the pump operational is performed:

A

entirely from the cab of the vehicle.

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11
Q

What should be done each time nonpotable water is pumped through an apparatus

A

Pump and piping should be thoroughly flushed with fresh water soon afterwards.

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12
Q

Which of the following would be used when the driver/operator first reports to an incident location in order to size up the scene before laying a supply line?

A

Reverse lay

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13
Q

can occur when pumping at a low residual pressure while being supplied by other apparatus

A

Cavitation of the pump

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14
Q

BEST describes when it is recommended that wheels be chocked?

A

Every time the driver/operator exits the cab

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15
Q

If a sprinkler system is to be supplied at the fire department connection and no specific information is available, the general guideline is to discharge:

A

150 psi (1 050 kPa) into the FDC

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16
Q

consists of laying hose from the fire to the water source?

A

Reverse lay

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17
Q

The two basic pressurized water supply sources are a fire hydrant and:

A

supply hose from another pumper.

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18
Q

the purpose of a four-way hydrant valve in making a lay?

A

Allows a second arriving pumper to be connected without interrupting the flow of water to the original supply line

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19
Q

Which of the following is a method used to determine additional water available from a hydrant?

A

Squaring-the-lines method

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20
Q

When the pump is in operation, which of the following is a responsibility of the driver/operator?

A

Monitor all gauges associated with the engine as well as with the operation of the fire pump.

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21
Q

When a pumper is connected to a hydrant and not discharging water, pressure shown on intake gauge is:

A

static pressure.

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22
Q

If an apparatus features a vacuum-type primer, the engine rpm should be kept:

A

as low as possible without causing the engine to stall.

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23
Q

In drafting operations, the amount of friction in the intake hose is MOST affected by:

A

the diameter and length of the hose.

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24
Q

When priming the pump and beginning drafting operations, a two-stage pump:

A

must have the transfer valve in the parallel (volume) position

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25
Q

is a step the driver/operator takes when transitioning to an external water supply?

A

Connect supply line into an appropriate intake of the fire pump

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26
Q

The process of making a fire pump operational begins:

A

after the apparatus is properly positioned and the parking brake is set.

27
Q

statements about dry pipe systems is MOST accurate?

A

They must be charged with water from a source such as the fire department pumper

28
Q

When a pumper is discharging water, the intake gauge displays

A

residual pressure.

29
Q

fter successfully priming the pump, the throttle setting should:

A

slowly be increased before attempting to open any discharges.

30
Q

wet standpipe systems that contain water under pressure is MOST accurate?

A

They may be used as soon as the hoseline is stretched and the valve opened.

31
Q

Which of the following determines the additional water available from a hydrant?

A

Difference between static pressure and residual pressure

32
Q

After transitioning to an external water supply, the driver/operator should:

A

close the tank-to-pump valve.

33
Q

Which is the MOST likely problem during drafting if the discharge pressure gauge begins to fluctuate with a corresponding loss of vacuum on the intake gauge?

A

Air is coming into the pump along with water

34
Q

What should a driver/operator do immediately upon indication that the water supply or pumping ability may be unattainable or interrupted?

A

Notify officer or Incident Commander

35
Q

Which of the following is the most common cause of an inability to prime?

A

An air leak that prevents primer from developing enough vacuum to successfully draft water

36
Q

During drafting operations, what can occur when water is being discharged faster than it is coming into the pump?

A

Cavitation

37
Q

Which is an indication that a pump is cavitating?

A

Lack of reaction on the pressure gauge to increases in the throttle

38
Q

When a dry standpipe system is charged, water will be discharged:

A

at all points where caps are off and valve is open.

39
Q

hich of the following is a characteristic of “dead end main” when referring to hydrants?

A

Contain higher amounts of sediment and deterioration

40
Q

MOST likely scenario if a supply line that was charged suddenly loses water?

A

The supply line has burst.

41
Q

statements about friction loss in standpipes is MOST accurate?

A

Generally, friction loss in a standpipe is small unless flow is very large.

42
Q

If water is not flowing for an extended period of time during fire attack, why might a circulator, bypass, or booster cooling valve be opened on a pump?

A

To prevent the pump from overheating

43
Q

MOST likely scenario if a supply line loses water but the supply line is intact?

A

The hydrant or water main has failed.

44
Q

In general, pumps supplying a relay operation or master stream are used to supply large amounts of water, and therefore require:

A

use of a parallel (volume) setting of the transfer valve.

45
Q

Which of the following consists of making a lay from the hydrant to the fire location?

A

Forward lay

46
Q

To create an effective fire stream during drafting operations, a lift of no greater than _____ is recommended.

A

20 feet (6 m)

47
Q

statements about water temperatures affecting drafting is MOST accurate?

A

Water temperatures may adversely impact the ability of the pump to reach capacity.

48
Q

After a drafting site has been selected, which of the following is a step in connecting to the pump

A

Couple strainer and required lengths of intake hose and make them airtight.

49
Q

When drafting, which of the following should be done when positioning the intake hose if the bottom slopes steeply from the water’s edge?

A

Place a roof ladder in the water and lay intake hose on it.

50
Q

Which of the following is the MOST important factor in choosing a draft site?

A

Amount of water available

51
Q

In order for a pumper to approach its rated capacity using a traditional strainer, there must be:

A

at least 24 inches (600 mm) of water over the strainer

52
Q

statements about hydrant selection is MOST accurate?

A

The closest hydrants may not be the most prudent choice because of safety or fire fighting needs.

53
Q

When shutting down the hydrant, why should all changes in flow be made smoothly?

A

To avoid water hammer and pressure surges on water systems

54
Q

Which is the first consideration in establishing a drafting operation?

A

Site selection

55
Q

If discharge flow volume is increased too much when operating from a pressurized water source:

A

intake pressure from the supply source may be reduced to a point that may damage the pump.

56
Q

The Most Important Factor in choosing a draft site is

A

the amount of water available

57
Q

The First Consideration in establishing a drafting operation is

A

site selection

58
Q

a backyard swimming pool contains

A

12,000 gallons

59
Q

low level strainers can draft water from tanks from

A

2 inches of water

60
Q

Water temp range for drafting at capacity

A

35-90 degrees

61
Q

A lift of 20 feet, the pump only operates at what percent of capacity

A

60 percent

62
Q

priming pumps are most effective when running at what RPMs

A

1000-1200 rpms

63
Q

Measuring from the surface of the water to the eye of the impeller, 1 inch or Mercury (Hg) means

A

1 ft of lift

Driver Ops (15 decks)

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