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Book 6- AOTM > AOTM > Flashcards

AOTM Flashcards

1
Q

atmospheric pressure

A

14.7 psi at sea level

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2
Q

What is the three phase maintenance program consist of

A
  1. Preventive maintenance
  2. Periodic maintenance
  3. Inspection tests
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3
Q

Preventive maintenance includes

A
  1. keeping equipment clean
  2. tightening leaky joints
  3. replacing hose gaskets as necessary
  4. Listening for unusual noises and watching for anything unusual in pump operation
  5. Performing the steps listed after pumping
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4
Q

When using the pump in cold weather, run it at least __ minutes to warm up gear case and drive out moisture that can damage internal parts

A

20 minutes

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5
Q

Double jacket hose allows higher working pressure

Cords running around the hose are called

A

woof

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6
Q

Cords of hose running lengthwise are called

A

warp

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7
Q

what material used for woof cords

A

dacron

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8
Q

What material used for warp cords

A

cotton

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9
Q

old lafd identification hose strip

A

2 black, 4 white, 2 red, 4 white and 2 black

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10
Q

hose working test pressure

A

600 psi

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11
Q

hose burst test pressure

A

900 psi

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12
Q

hose beds should be reloaded at least once each __ days to change the folds and prevent kinks which may damage the linear of the hose

A

30

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13
Q

dirty hose washed w/

A

cold, clear water only
no other agent used except with permission of the storeroom

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14
Q

damp hose shall not remain on apparatus longer than

A

24 hours

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15
Q

purpose of 4 way valve

A

change from direct hydrant pressure to pump pressure w/o shutting off the flow of water

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16
Q

static pressure

A

water w/o motion or standing still

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17
Q

what makes a good fire stream

A

reaches seat and pass 9/10 of its volume of water inside a 15” circle and

3/4 of it inside a 10” circle

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18
Q

fire stream greatest horizontal range when angle is

A

30 degree

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19
Q

Greatest vertical range when angle is

A

75 degree

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20
Q

momentary nozzle reaction when the nozzle is first opened is __ % greater than the reaction after the water is flowing

A

20%

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21
Q

when flow of water in a hose line suddenly stops

A

water hammer

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22
Q

When a pump is connected to a hydrant, it is desirable to maintain at least __ to __ pounds pressure on the intake (compound) gage

A

5 to 10 psi

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23
Q

what does a soft and flabby suction indicate

A

maximum flow for the hydrant has been reached

pump is beginning to run away from the water

24
Q

what is the condition where vapor cavities are formed in the pump and can cause serious damage

A

cavitation

25
Q

operation runs pump faster than suction hose can deliver water to pump when drafting results in

A

cavitation

26
Q

Pump operator supplying a ladder pipe should pump __ to __ psi above the required operating pressure after filling the lines laid to the base of the ladder

A

25-40 psi

*insures against an excessive pressure drop when ladder pipe nozzle is first opened

27
Q

what is the difference in elevation between the water level and the center of the pump when a pumper is drafting water

A

Lift

28
Q

At sea level the atmospheric pressure is 14.7 psi. This pressure is capable of sustaining a column of water 33.9 feet in height. This is arrived by multiplying 14.7 pounds by 2.304, the height of water which will exert 1 pound pressure. If a pump could produce perfect vacuum, the max height it could lift water at sea level is __ ft

A

33.9 feet

29
Q

Taking into consideration the inability to create a perfect vacuum, the effect of minute air leakage and the frictional resistance through the suction hose, the common practice is to use two-thirds of the theoretical distance, or 22-2/3 feet at sea level for the practical limit of draft

A

reference

30
Q

Atmospheric pressure is reduced ___ pound for each 1000 feet of elevation above sea level.

A

one-half

31
Q

When drafting suction strainer will be submerged at least __ feet below the sea level of the water

A

2’

32
Q

When drafting water should be at least __ feet deep where the strainer is located to provide clearance below and sufficient depth above it

A

4’

33
Q

Pumps are rated at cap acting using a __ inch suction and a lift of 10 feet

A

6”

34
Q

rotary gear and rotary vane pumps are vacuum producing units. They are positive displacements pumps capable of displacing __ and __ at the same time

A

air and water

35
Q

Centrifugal pumps are not capable of creating a vacuum due to the fact that __ can leak through the pump

A

air

*in order for centrifugal pumps to be used at draft, priming pumps must be utilized

36
Q

During temporary shutdown of draft maintain __ psi discharge pressure to avoid losing prime

A

35 psi

37
Q

considerations when setting up for a relay

A
  1. Topography
  2. Time necessary to set up
  3. Total amount (gpm) of water estimated to be necessary at the point of ultimate consumption
  4. Size and length of hose necessary to carry the amount of water needed
  5. Apparatus available to do the pumping
38
Q

relay operation:
necessary to keep individual pumps in a line to a __ pound maximum

A

200

39
Q

Priming vacuum max should be at least __ inches of mercury

A

20

40
Q

Drafting; do not attempt lifts exceeding __ feet except at low altitudes and with equipment in new condition

A

22

41
Q

water over what temp is too hot for drafting

A

over 85F

42
Q

downtown area curbs are approx. ___ feet from the building line

A

11 feet

43
Q

where spotting made next to curb operating aerial between 5th and 8th floors maintain a climbing angle of

A

70-80 degrees

44
Q

When spotting is made outside line of cars, any operation below the 7th floor will conduct at a climbing angle less than __ degrees

A

70 degrees

45
Q

if uphill throw aerial

A

stop short of intended spot and raise aerial

*more stable ladder and rung tilt reduced

46
Q

if headed downhill throw aerial

A

spot past where the intended throw

47
Q

best to have aerial hoisted at least __ degrees before operating other controls

A

45

48
Q

extreme caution when operating aerial in winds as fast as

A

35 mph and over

49
Q

safe driving is made up of

A

20% safe vehicle
20% good physical condition of driver
60% good attitude

50
Q

perception and reaction time

A

3/4 second each

51
Q

smith system:
get big picture ___ mile ahead when on rural roads

A

1/2 mile

52
Q

air brake equipment

A

perception/reaction distance + brake lag + effective breaking distance= total stopping distance

53
Q

descending grade with constant brake application of approx __ psi

A

10

54
Q

brake lag distance

A

.4 (four tenths of a second)

55
Q

do not idle diesel engine in excess of __ minutes

A

30 minutes

Book 6- AOTM (7 decks)

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