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engineer exam > Hydrolics > Flashcards

Hydrolics Flashcards

1
Q

What is the friction loss for deck gun

A 
400 GPM 5
 500 GPM 8
600 GPM 12 
800 GPM 21 
1000 GPM 32
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2
Q

What is the friction loss for ladder pipes, water towers, and standpipes

A

25 to 75 PSI

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3
Q

What pressures do you pump master stream fog nozzle

A

500 GPM 92 NP
750 GPM 96 NP
1000 GPM 100 NP

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4
Q

The master stream is over how many GPM

A

400 GPM

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5
Q

What is theoretical lift

A

33.8 feet = (14.7 psi)(2.3 ft)

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6
Q

What is practical lift

A

20 to 25 ft

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7
Q

For every 1000 FT gain in altitude how much loss of lift is created

A

1ft

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8
Q

What is the formula for friction loss

A

FL = CQ2L

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9
Q

What is the formula for determining extra water

A

Static-residual (100)/static

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10
Q

What is the formula for static unknown

A

(R1-R2)/2+ R1

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11
Q

What are the steps for relay pumping

A
  1. determine friction loss/100 FT
  2. Dist./pumper=(available pressure)(100)/fl/100
  3. # pumpers=(total dist.)/(dist./pumper)
  4. Spacing=(total dist.)/(#pumpers)
  5. Add attack pumper
  6. Determine spacing starting at source
  7. Determine PDP: (fl/100)(distance pumped)+50PSI
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12
Q

What is the friction loss for a portable monitor

A 
400 GPM  6
500 GPM  9
600 GPM 13
800 GPM 23
1000 GPM 36
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13
Q

What is the intake pressure desired at each engine during relay pumping

A

50 PSI

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14
Q

What is the max pressure for 4” hose

A

185 psi

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15
Q

What is the formula for height of lift

A

1.13in hg (in hg)

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16
Q

What are the coefficients for 1”-5” and duels

A 
1"       500
1.5"    22
1.75"  11
2.5"    1.5
3"        .7
4"        .15
Duels   .07
5"         .06
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17
Q

What is the formula for fog nozzle actual GPM

A

(.1)(sq root of P) (GPM rated)

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18
Q

What is the GPM estimated for fog nozzle

A

GPM rated-(.15) (gpmr)

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19
Q

What is the formula for GPM actual tip

A

29.7 X diameter squared X the square root of the nozzle pressure

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20
Q

What do you pump a master stream Straight tip at?

A

80PSI

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21
Q

What is the friction loss for a wye and Siamese

A

10 PSI

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22
Q

How high will 1 psi raise water

A

2.3 ft

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23
Q

Add how many PSI for each floor above the first

A

5 PSI

24
Q

PDP

A

TFL+-HP+NP

25
Q

What is the GPM formula for a sprinkler head

A

.5P + 15

26
Q

What is the friction loss for stand pipe

A

25PSI

27
Q

When flowing between two identical lines to a Siamese how do you figure

A

Divide the flow by two and figure from there

28
Q

When pumping up or down hill what pressure do you add/subtract

A

.5 PSI ft

29
Q

What pressure do you pump the sprinkler system

A

150 psi

30
Q

Where should the engine be when pumping a sprinkler system

A

At the hydrant to overcome friction loss and the lines between hydrant in the FDC

31
Q

What is the friction loss for a water tower

A

25 psi

32
Q

What is the formula for determining the net pump pressure

A

Discharge pressure- intake pressure

33
Q

What is the formula for determining net pump pressure at a draft

A

(Dis pres) +.5 height of lift

34
Q

What is the initial pressure from relay pumping operations

A

150 psi

35
Q

What is the shutdown procedure for relay pumping

A

Attack engine throttle down take the pump out of gear and lets the water continue to flow. The next engine follows the same procedure in addition to opening an additional discharge, this continues until the source engine is reached and shut down

36
Q

Where is the largest capacity pump replaced in a pumping operation? Smallest?

A

Largest at source

Smallest as fire attack or last

37
Q

How do you figure pressure available to overcome friction loss

A

Available pressure -20 PSI

38
Q

How do you figure percent drop

A

Static pressure minus residual pressure times 100 divided by static pressure

39
Q 
Pumping like lines decrease in intake pressure:
0 to 10%
10.01-15%
15.01-25%
25.01+
A

3
2
1
Less than 1

40
Q

What is the formula for determining the nozzle reaction on a tip

A

29.7 diameter squared times the square root of the nozzle pressure

41
Q

What is the formula for determining the nozzle reaction on the

A

.05 times the GPM times the square root of the nozzle pressure

42
Q

What is the formula for determining GPM at a hydrant

A

29.7 times diameter squared times the square root of the nozzle pressure times .09 for friction loss in the hydrant

43
Q

What is the formula for determining the available flow at 20 PSI from hydrant

A

Square root of static -20 divided by static minus residual times the observed flow times .9

44
Q

What is the formula for determining gallons in a cylindrical tank

A

diameter squared times six times length

45
Q

What is the formula for determining gallons in a rectangular tank

A

Length times with times height times 7.5 gallons per cubic foot

46
Q

How much is a gallon of water weigh

A

8.33 pounds

47
Q

What percent foam do we apply AFFF to a petroleum fire

A

3%

48
Q

What percent do we apply AFFF to a polar solvent fire

A

6%

49
Q

What is the formula for determining how much Light water will be required

A

Gallons times minutes times percent mix

50
Q

Gallons per minute for light water

A

Minutes times percent mix

51
Q

What is the normal layout for a helitack operation?
What pressure is delivered to the kamlock?
What is the GPM at the kamlock

A

3” to wye to 3” to kamlock and 1 3/4 protection line
15 PSI NP
340 GPM

52
Q

What is the friction loss per hundred feet of 3 inch in helitack operation

A

10 PSI per hundred feet

53
Q

How many gallons in one cubic foot of water

A

7.5 gallons

54
Q

How much does a cubic foot of water weigh

A

62.48 pounds

55
Q

How do we roundoff numbers for calculations

A

Round two places for calculations round one place for the answer

engineer exam (13 decks)

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