Exam Questions Flashcards
(105 cards)
1
Q
Water services designed the grid system to supply water for commercial, residential and firefighting. What percentage is intended for commercial and residential combined?
A
20%
2
Q
The maximum space between hydrants in a residential area is?
A
300 meters
3
Q
The maximum space between hydrants in an industrial area is?
A
150 meters
4
Q
To achieve the required flow, water services allows the us of how many hydrants?
A
3
5
Q
How far away does the second hydrant need to be to have minimal impact on the initial water supply system
A
2 blocks
6
Q
How often are hydrants updated on the MDT?
A
Quarterly
7
Q
Friction loss is reduced by using?
A
Large diameter hose
8
Q
What is the damaging force created by quickly stopping water that is flowing in a closed system known as?
A
Water hammer
9
Q
If the nozzle is at a higher elevation than the pump, the static nozzle pressure will be _________ the pressure at the pump??
A
Lower than
10
Q
Friction loss is caused by?
A
Kinks and bends
Couplings
Movement of water in the hose
11
Q
the city of Calgary water system has how many pressure zones?
A
47
12
Q
At sea level atmospheric pressure is equal to?
A
100kPa (14.7psi)
13
Q
Under extreme circumstances the fire department can boost system pressure by pumping back into a hydrant? True or False
A
False
14
Q
How much greater can the FL of an old hose be compared to that of a new hose?
A
As much as 50% greater
15
Q
The transfer valve allows the two stage pump to run in which two positions?
A
Pressure and volume
16
Q
City of Calgary hydrants are on what type of a system?
A
Grid system
17
Q
What is a secondary feeder line?
A
A network of intermediate sized pipes that reinforce the grid within the various loops of the primary feeder system
18
Q
What is a primary feeder line?
A
Large pipes, with relatively widespread spacing that carries large quantities of water to various points of the system for local distribution into smaller mains
19
Q
What is a distributor line?
A
The grid arrangement of smaller mains serving individual fire hydrants and city block consumers
20
Q
what is a dead end hydrant?
A
A hydrant that receives water flow from only one direction
21
Q
How much water does a drop tank hold?
A
14,000 litres
22
Q
How much does 1 cubic meter of water hold and weigh?
A
Holds 1000 Litres and weighs 1000kg
23
Q
When pumping multiple lines of different pressures the PSG is set to which line?
A
The line with the highest pressure. All other lines are gated back
24
Q
The overheat protection manager prevents the pump from overheating by?
A
Dumping water from the pump onto the ground
25
The gradually increasing size of the waterway ________ the velocity of the water thus enabling the pressure to ___________ proportionally
Decreases and build up
26
On a centrifugal pump water enters the impeller through the ?
Eye
27
At sea level the pump can theoretically lift water how high?
10m
28
What is the difference between vanes and valutes?
Vanes transmit motion to the water, volutes carry the water away from the impeller/pump
29
Most CFD apparatus have a water capacity of how many litres?
2500L
30
When bringing on a hydrant the operator should do what two things to compensate for potential spike?
Raise the pump discharge pressure and lower the hand line pressure
31
What is direct application when talking about foam application?
Generally limited to class A foam applications. As implied foam is applied directly to the burning material
32
What is the rain down method when talking about foam application?
Used when other methods of application are not feasible due to elevation or the nature of the fuel container. stream is directed above the container and foam is allowed to rain down onto the surface of the fuel
33
What is the bank down method when talking about foam application?
Used when a vertical surface is available near or within the area of the ignitable liquid. The foam stream is directed onto the vertical surface allowing the foam to run down and spread across the surface of the fuel
34
What is the roll on method when talking about foam application?
The foam is directed onto the ground near the pool or the spill. The foam rolls across the surface until the entire surface is covered and the fire is extinguished. This method is only used on open ground
35
What is a polar solvent?
Mixes readily with water. Ex. Acetone, isopropanol, methanol, alcohol
Polar solvents destroy regular foams
36
What is a hydro carbon?
Does not mix readily with water
Ex diesel, gasoline, oil
37
Dumping the tender by pumping it out through a hose is more efficient than using the dump valve? True or false
False
38
A dry hydrant for drafting is a hydrant that?
Is used for drafting from a static supply
39
The steps to start drafting (with the pump in gear) are?
Put the PSG in RPM mode at approximately 1100 RPM. Pull.push the primer until the pressure appears on the discharge, open a discharge
40
To increase shuttle efficiency FF should do what?
Maintain training on filling and dumping tenders
41
The priming pump is what kind of pump?
Positive displacement pump
42
When filling the booster tank be sure not to do what?
Cavitate the pump
43
The relief valve on the TFT in valve is set to activate at what pressure?
1260kPa or lower
44
When considering a natural water supply for drafting which of the following would be a issue?
Wet and soft ground
Shallow water
Spilt or debris laden water
45
Filling and dump sites should be planned to allow for?
Continuous forward motion
46
Class B foams are conductive and are not recommended for use on electrical fires or in the vicinity of charge electrical lines/equipment? True or false.
True
47
After bringing on a hydrant operators need to do what three things?
Mark the compound gauge
Close the tank to pump
Open tank fill
48
Centrifugal pumps take advantage of incoming pressure and add to it? True or false.
True
49
before charging any lines, operators must ensure what?
The nozzle FF is ready for water
50
What are the four aspects of the foam tetrahedron
Water
Air
Foam concentrate
Mechanical agitation
51
How does foam help to extinguish and/or prevent the ignition of class B materials?
Separating
Cooling
Suppressing (smothering)
52
When using multiple tanks at a dump site the goal is to?
Keep the pool at the attack engine the fullest
53
when drafting the primer creates a lower pressure in the pump and intake hose to help move the water. What external force pushes water from the source up the intake hose?
Atmospheric pressure
54
In which instance would the application of Class B foam be most appropriate to help with fire suppression?
A fire involving any type of flammable liquid where blanketing and smothering for vapour suppression is of the first importance
55
Flow meters are accurate to +/- what percent?
3%
56
What is the definition of specific gravity?
The density of liquids in relation to water
57
some fire apparatus have multiple impellers, each impeller is commonly referred to as what?
Stages
58
What is the definition of a master stream?
Answer had something to do with not being able to be controlled without mechanical aid
59
What is the definition of altitude?
Is the position of an abject above or below sea level
60
What is the appropriate foam eductor setting for a deep hydro carbon spill?
3%
61
what is the appropriate foam eductor setting for a shallow hydro carbon spill?
1%
62
Who determines the need to set up relay/drafting operations?
Incident commander
63
What determines the need for a relay operation?
The amount of water required at an incident and the distance between the fire scene and water source
64
What is the purpose of a relief valve
Relieves excess pressure before damaging the pump
65
What part of the pump adjust the engine RPM to compensate for fluctuations in pressure?
The pressure sensing governor (or just governor)
66
What is the percentage of water in water foam mixtures?
94-99%
67
Three statements about foam, choose the correct statement..
One of the correct answers is that there are two basic types of foam
68
You are flowing 700lpm with a 44mm handline through five 15m lengths of 44mm hose. What is your pump discharge pressure?
1100kPa
69
You are supplying a blitz fire set on “low” flowing 1900lpm through 6 15m lengths of 65mm hose. What is the nozzle pressure?
970 kPa
70
You are supplying a blitz fire with a fog nozzle flowing 1900lpm through twin 65mm (Siamese) lines. What is the friction loss per 15m of hose?
36 kPa
71
You have a 45m lay of 65mm hose flowing through a gated wye suppling two 44mm hose lays 60m long. Each 44mm nozzle is flowing 720lpm with a nozzle pressure of 350 kPa. What is the discharge pressure assuming no elevation change?
1290 kPa
72
Using the formula: FL/L = (Q/100)^2 x C to solve the equation. Values 65mm hose flowing 1000lpm, c for 65mm hose is .8, L=30m
80
73
Use the formula FL/L = (Q/100)^2 x C
Values
65mm hose flowing 2000lpm
C for 65mm hose is .8
L = 30m
320
74
Use the formula FL/L = (Q/100)^2 x C
Values
44mm hose flowing 700lpm
C for 44mm hose is 6
L= 30m
294
75
You are supplying two 44mm handlines at 950kPa and an aerial with an aromatic 1250 nozzle. You are being supplied by a hydrant with a static pressure of 459kPa through 3 lengths of 125mm hose. According to table 2.3 hose much water is remaining?
130lpm
76
You are supplying a blitz fire with a 32mm nozzle flowing 1450lpm. What is the friction loss per length (15m) when using 60m of 65mm hose?
84kPa
77
You need to supply two 44mm nozzles at 700lpm each, one blitz fire at 1900lpm and a 65mm handline at 1000lpm. The hydrant has a static pressure of 550kpa. What is the maximum forward lay from the hydrant to achieve the required fire flow?
7
78
What is the appropriate foam eductor setting for a polar solvent spill?
3%
79
What pressure is added for a high-rise system when calculating pump discharge pressure?
150kPa
80
There was a questions about what impacts FL in a high-rise standpipe system
Answer was all of the above for me
81
What is the coefficient of friction for a 77mm hose?
0.4
82
What is the coefficient of friction for a 65mm hose?
0.8
83
What is the coefficient of friction for a 44mm hose?
6
84
What is the coefficient of friction for a 125mm hose?
0.03
85
What is the optimum nozzle pressure for a solid bore handline (highlighted in green)?
350 kPa
86
What is the appropriate foam eductor setting for a deep hydrocarbon spill?
3%
87
a relay pump supplying 125mm hose rated to 1400 kPa cannot exceed what discharge pressure?
1260kPa
88
When pumping in a relay (as well as from a hydrant) the residual incoming pressure should not drop below what?
150 kPa
89
What is the “EP” on a 20 story high rise building (4m/floor) with a fire on the 13th floor?
480 kPa
90
Use the formula PDP = TFL + APP +/- EP + NP
What does EP stand for?
Elevation pressure
91
What is the pump discharge pressure for a high-rise fire on the 36th floor?
2340 kPa
92
What is the initial pressure setting on the supply truck during a relay, then what is it increased to?
350 kPa and 800 kPa
93
How many plum must a engine be flowing in order to account for the friction loss of an appliance?
1400 lpm or more
94
How much pressure is added to compensate for the friction loss of an appliance?
70 kPa
95
You are supplying a blitz fire with a 32mm stackable tip at 960 kPa on a leader line and a 44mm jump line at 650 kPa. Your compound gauge has gone from 550 kPa to 478 kPa. How much water is available according to chart 2.4?
4600lpm
96
You are supplying a blitz fire at 1900lpm and a 65mm handline at 510 kPa. Your static hydrant pressure was 450 kPa. The compound gauge now reads 360 kPa, can you supply an aerial with an aromatic 1250 nozzle?
No
97
What is the FL per length of 65mm hose flowing 1400 lpm?
85kPa
98
What pressure does 44mm leader line operate at?
950 kPa
99
What pressure does a 44mm jump line operate at?
650 kPa
100
What pressure does a 65mm leader line operate at?
510 kpa
101
What pressure does a 65mm leader line with a blitz fire on “low” setting operate at?
790 kPa
102
You are supplying a 44mm handline flowing 700 lpm through four 15m lengths (60m) of 44mm hose. The fire attack crew is working 8 meters above the pump. What is the PDP?
1018 kPa * from module questions
103
You are supplying a blitz fire with a 32mm nozzle flowing 1450lpm. What is the total FL when using a 60m of 65mm hose?
336 kPa
104
After bringing on the hydrant operators need to _____ the compound gauge, ________the tank to pump valve and ______the tank fill valve
Mark, close, open
105
Direct pumping is performed when? (Drafting)
Minimal water is required
