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Drivers Test > Hydraulics > Flashcards

Hydraulics Flashcards

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1
Q

Appliance loss in a ladder pipe

A

25 psi

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2
Q

Cubic foot of water weight

A

62.5 lbs

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3
Q

“Fireground” master steam flows

1 1/4:
1 3/8:
1 1/2
1 3/4
2
A 
400
500
600
800
1000
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4
Q

Gallons in a cubic foot

A

7.5 gallons

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5
Q

Fairfax county engines carry how much foam?

A

40 gallons class B

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6
Q

How many feet from the pump must foam eductor be placed?

A

50 ft

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7
Q

How many feet from nozzle must eductor be placed?

A

Within 200 ft

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8
Q

One cubic foot contains how many cubic inches?

A

1728 cubic inches

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9
Q

One cubic foot contains how many gallons?

A

7.5

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10
Q

One cubic foot of fresh water weighs how many pounds?

A

62.5 pounds

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11
Q

One gallon contains how many cubic inches?

A

231 cubic inches

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12
Q

One gallon of fresh water weighs how many pounds?

A

8.33 pounds

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13
Q

One column of 1’ high exerts a pressure of what at its base?

A

.434 psi

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14
Q

A column of 2.304’ high exerts how much pressure at its base?

A

1 psi ( 1/.434)

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15
Q

50’ of 1.75 hose contains how many gallons?

A

6.24

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16
Q

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

A

7.2

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17
Q

50’ of 2.5” contains how many gallons?

A

12.74

18
Q

50’ of 3” hose contains how many gallons?

A

18.35

19
Q

100’ of 4” contains how many gallons?

A

65.25

20
Q

100’ of 5” contains how many gallons?

A

101.94

21
Q

What is a primer pump?

A

A positive displacement pump used to evacuate air from a centrifugal pump house omg allowing the pump to receive water

22
Q

A Siamese does what?

A

An appliance that turns 2 lines into one

23
Q

A wye is?

A

An appliance that breaks one hose line into two

24
Q

What is the formula for finding column in a rectangle or square?

A

L x W x D x 7.5 (number of gallons in a cubic foot)

If using a pool with 3’ shallow and 9’ deep end. Take the average of those and divide by two

3+9/2=6

25
Q

How would you know how many pounds of water were in a rectangular box?mi no

A

L x W x D = cubic feet

Total #of cubic feet x 62.5 (weight of a cubic foot)

26
Q

How do you find the column in a cylinder?

A

π x R2 x H or L x 7.5

27
Q

What is the formula to find the gpm out of a smooth note?

A
  1. 7 x d2 x square root of NP

29. 7 is the constant.

28
Q

What’s the square root of 50, 80, 100

A

7.07
8.94
10

29
Q

What are the tip sizes gpm master and hand line as well as foreground and theoretical?

A

15/16- 185

1 1/8- 266 & 250

1 1/4- 328 & 325

       Above 80psi

1 1/4- 415 & 400

1 3/8- 502 & 500

1 1/2- 598 & 600

1 3/4- 814 & 800

2- 1062 & 1000

30
Q

What does a piercing nozzle flow?

A

125 gpm at 100 psi

31
Q

What does a deacon shower flow?

A

270 gpm at 75 psi

32
Q

What can a forestry nozzle flow?

A

12-60 gpm some 22 gpm at 100psi

33
Q

The 2.5 and 1.5 distributer nozzle flows?

A
  1. 5- 250 gpm at 100psi

1. 5- 95 gpm at 50psi

34
Q

The 2.5 and 1.5 cellar nozzle flows what?

A
  1. 5- 350 gpm at 100psi

1. 5- 160 gpm at 100psi

35
Q

What are the four principles of friction loss?

A

1) double the length of hose and double the friction loss
2) if the flow rate is doubled the friction loss will be 4 times greater
3) when the flow remains constant the friction loss in a hose will decrease when the hose increases
4) friction loss is velocity based meaning the faster you move water the more friction loss you will have

36
Q

What are the friction coefficients?

A 
1”-150
1 3/4- 10 (15.5 per ifsta)
2”- 8
2.5”- 2
3”- .8
4”- .2
5”- .08
37
Q

What are your appliance loss pressures?

A 
350gpm and under- 0
350 gpm and greater- 10
25- ladder pipes
25- master streams
25- standpipes
38
Q

A column of water exerts pressure of what psi at a foot high?

A

.434 psi

39
Q

The JS-10 can be used as variable spray or straight and has to be fully open or closed. And has a NP and gpm of what?

A

100 gpm and100 psi at the tip

40
Q

The inline foam educator must be how many feet from the pump?

A

50ft to prevent turbulence from the pump

41
Q

The foam educator is capable of flowing how many gpm

A

95-125 gpm

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