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App Tech Test - Moreland > Fairfax County Hydraulics Theory and Practical Applications, 2014 > Flashcards

Fairfax County Hydraulics Theory and Practical Applications, 2014 Flashcards

1
Q

One cubic foot contains how many gallons?

A

7.5 gallons

P.6

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2
Q

What is hydraulics?

A

The study of fluids at rest and in motion

P. 5

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3
Q

How much does a gallon of water weigh?

A

8.33 pounds

P. 7

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4
Q

A column of water 1’ high exerts a pressure of what psi?

A

0.434 psi

P.7

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5
Q

50’ section of 1.88” hose contains how many gallons?

A

7.2 gallons

P.7

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6
Q

50’ section of 2.5” hose contains how many gallons?

A

12.74 gallons

P.7

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7
Q

50’ section of 3” hose contains how many gallons?

A

18.35 gallons

P.7

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8
Q

100’ section of 4” hose contains how many gallons?

A

65.25 gallons

P.7

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9
Q

100’ section of 5” hose contains how many gallons?

A

101.94 gallons

P.7

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10
Q

What is the NP for a smooth bore nozzle and what can it be increased to?

A

50psi and increased to 65psi

P.7

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11
Q

What is the smooth bore nozzle pressure for master streams and what can it be increased to?

A

80psi and increased to 100psi

P.7

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12
Q

Can you increase the NP of the Akron assault nozzle?

A

No

P.7

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13
Q

What is a pumping apparatus that is supplying attack lines called?

A

Attack pumper

P.7

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14
Q

What is discharge pressure?

A

Velocity of water pressure measured in PSI

P.7

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15
Q

What is discharge velocity?

A

Rate at which water travels from an orifice, can be measured with a pitot gauge

P.7

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16
Q

What is a gutter line?

A

Line directly from a hydrant to an attack pumper

P.8

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17
Q

What is flow pressure?

A

Pressure created by velocity of water coming from a discharge

P.8

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18
Q

What is head pressure?

A

Water pressure due to elevation

P.8

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19
Q

What is normal operating pressure?

A

Pressure found in a water distribution system during normal consumption demands

p. 8

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20
Q

What is pumper discharge pressure?

A

Actual velocity pressure of the water (measured in PSI) as it leaves the pumper

p.8

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21
Q

What is residual pressure?

A

pressure remaining in a water system when water is flowing

p.8

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22
Q

What is velocity?

A

the speed at which water passes a given point

p.8

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23
Q

How do you calculate the volume of a rectangular shaped container?

A

Volume in gallons = L’ x W’ x D’ x 7.5

p.10

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24
Q

How do you calculate the volume of a cylinder?

A

Volume in gallons = Pie x r squared x H’orL’ x 7.5

p.11

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25
Q

What is the flow(GPM) formula for a smooth bore nozzle?

A

gpm = 29.7 x d squared x square root of the nozzle pressure

p.14

26
Q

What is the theoretical GPM calculations for hand-lines:

1/2"
7/8"
15/16"
1"
1 1/8"
1 1/4"
A 
1/2" = 53
7/8" = 161
15/16" = 185
1" = 210
1 1/8" = 266
1 1/4" = 328

p.14

27
Q

What is the fire ground GPM calculations for hand-lines:

1/2"
7/8"
15/16"
1"
1 1/8"
1 1/4"
A 
1/2" = 50
7/8" = 150
15/16" = 185
1" = 200
1 1/8" = 250
1 1/4" = 325

p.14

28
Q

What is the theoretical GPM calculations for master streams:

1 1/4"
1 3/8"
1 1/2"
1 3/4
2"
A 
1 1/4" = 415
1 3/8" = 502
1 1/2" = 598
1 3/4 = 814
2" = 1062

p.15

29
Q

What is the fire ground GPM calculations for master streams:

1 1/4"
1 3/8"
1 1/2"
1 3/4
2"
A 
1 1/4" = 400
1 3/8" = 500
1 1/2" = 600
1 3/4 = 800
2" = 1000

p.15

30
Q

What gpm is the 1” adjustable gallonage fog nozzle?

A

12-60 gpm

p.15

31
Q

What gpm is the 2.5” adjustable Akron Fog Nozzle?

A

125-250 gpm

p.15

32
Q

What does the mercury monitor flow?

A

500 gpm

p.15

33
Q

What is the gpm range for master stream fog nozzles?

A

150-2000gpm

p.15

34
Q

How long are the booster reels?

What is the GPM?

What is the NP?

A

150’

12-60 gpm

100psi

p.16

35
Q

How long are the forestry hose sections?

What is the nozzle size?

What is the NP?

A

50-100’

12-60gpm

100psi

p.16

36
Q

What is the flow rate and psi for DECON showers?

A

270 gpm at 75 psi

p.17

37
Q

What is the flow rate and psi for piercing nozzles?

A

125 gpm at 100 psi

p.17

38
Q

What are the flow rates and psi for:

  1. 5” distributer nozzle?
  2. 5” distributer nozzle?
A

250 gpm at 100 psi

95 gpm at 50 psi

p.18

39
Q

What are the flow rates and psi for:

  1. 5” cellar nozzle?
  2. 5” cellar nozzle?
A

350 gpm at 100 psi

160 gpm at 100 psi

p.18

40
Q

What are the GPMs and PSI for the fixed monitor smooth bore break away nozzles?

1 3/8”
1 1/2”
1 3/4”
2”

A

1 3/8” = 500 gpm at 110 psi
1 1/2” = 600 gpm at 110 psi
1 3/4” = 800 gpm at 110 psi
2” = 1000 gpm at 120 psi

p.18

41
Q

What are the GPMs and PSI for the Akron Adjustable Flow Nozzle master streams?

A

500 gpm at 100 psi
750 gpm at 110 psi
1000 gpm at 130 psi
1250 gpm at 140 psi

p.19

42
Q

What is the smooth bore tip size for the mercury monitor?

A

1 3/8”

p.19

43
Q

What is the max inlet pressure for the mercury monitor?

A

150 psi

p.19

44
Q

What is the appliance loss for the mercury monitor?

A

10 psi

p.19

45
Q

What are the 4 basic principles for friction loss?

A

1st = all variables being the same, friction loss with vary directly with the length of hose or pipe (doubling length doubles friction loss)

2nd = If the flow rate is doubled the friction loss will be four times greater

3rd = When the flow remains constant, the friction loss in a hose will decrease when the diameter of the hose in increased

4th = For any given flow velocity, friction loss is independent of pressure. The velocity of water through a hose, not pressure, causes friction loss.

p.21

46
Q

What are your friction loss coefficients?

1"
1 3/4"
2"
2.5"
3"
3.5"
4"
5"
A 
1" = 150
1 3/4" = 10 for FFX, 15.5 per IFSTA
2" = 8
2.5" = 2
3" = .8
3.5" = .34
4" = .2
5" = .08

p.21

47
Q

What are your appliance loss numbers in PSI?

A

< 350 gpm = 0psi
> 350 gpm = 10psi
Ladder pipes, Master streams, and Standpipes = 25 psi

p.24

48
Q

What is your maximum PDP?

A

250 psi

p.28

49
Q

What is the JS-10 gpm and psi?

Is it for low or high expansion foam?

A

100gpm at 100psi

low expansion

p.31

50
Q

What is the flow and psi for the portable foam eductor?

How far from the pump panel should it be?

How far from the nozzle can it be?

How high can the nozzle be of the eductor?

A

95-125 GPM at 200psi

50’ and 200’

5’

p.31

51
Q

How much foam do FFX county pumpers carry?

A

40 gallons

p.32

52
Q

How much do CAFS pumpers carry?

A

40 gallons of class A and 40 gallons of class B

p.32

53
Q

How long can CAFS operate without overheating?

A

2 hours

p.33

54
Q

How long can CAFS lines be?

A

up to 250’

p.33

55
Q

What is your starting pressure for 4” supply lines?

3” supply lines?

3” and 4” used together supply lines?

A

50 psi

100 psi

100 psi

p.34

56
Q

Most fire hydrants in FFX deliver a minimum of ______ gpm?

A

1000 gpm

p.36

57
Q

What are your coefficients for:

two 3” lines?

one 4” and one 3” line?

two 4” lines?

A
  1. 2
  2. 09
  3. 05
    p. 38
58
Q

What is your percentage drop formula and what are the rules for additional water available?

A

(SP - RP)100 / SP

0-10% = 3x like volume
11-15% = 2x like volume
16-25% = 1x like volume
>25% = less then 1x like volume

p.40

59
Q

When do you charge sprinkler systems?

A

When there is smoke or fire showing upon confirmation of a working fire

p.44

60
Q

When do you charge a combination system?

A

immediately upon arrival on the scene and without orders

p.44

61
Q

What RPM do you use for drafting?

A

1000 to 1200 rpm

p.47

62
Q

What is your nozzle reaction formula for smooth bore?

Fog stream?

A

Smooth bore = 1.57 x d squared x NP

Fog Stream = .0505 x Q x Square root of NP

p.48

App Tech Test - Moreland (5 decks)

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