Exam Questions Flashcards
Water services designed the grid system to supply water for commercial, residential and firefighting. What percentage is intended for commercial and residential combined?
20%
The maximum space between hydrants in a residential area is?
300 meters
The maximum space between hydrants in an industrial area is?
150 meters
To achieve the required flow, water services allows the us of how many hydrants?
3
How far away does the second hydrant need to be to have minimal impact on the initial water supply system
2 blocks
How often are hydrants updated on the MDT?
Quarterly
Friction loss is reduced by using?
Large diameter hose
What is the damaging force created by quickly stopping water that is flowing in a closed system known as?
Water hammer
If the nozzle is at a higher elevation than the pump, the static nozzle pressure will be _________ the pressure at the pump??
Lower than
Friction loss is caused by?
Kinks and bends
Couplings
Movement of water in the hose
the city of Calgary water system has how many pressure zones?
47
At sea level atmospheric pressure is equal to?
100kPa (14.7psi)
Under extreme circumstances the fire department can boost system pressure by pumping back into a hydrant? True or False
False
How much greater can the FL of an old hose be compared to that of a new hose?
As much as 50% greater
The transfer valve allows the two stage pump to run in which two positions?
Pressure and volume
City of Calgary hydrants are on what type of a system?
Grid system
What is a secondary feeder line?
A network of intermediate sized pipes that reinforce the grid within the various loops of the primary feeder system
What is a primary feeder line?
Large pipes, with relatively widespread spacing that carries large quantities of water to various points of the system for local distribution into smaller mains
What is a distributor line?
The grid arrangement of smaller mains serving individual fire hydrants and city block consumers
what is a dead end hydrant?
A hydrant that receives water flow from only one direction
How much water does a drop tank hold?
14,000 litres
How much does 1 cubic meter of water hold and weigh?
Holds 1000 Litres and weighs 1000kg
When pumping multiple lines of different pressures the PSG is set to which line?
The line with the highest pressure. All other lines are gated back
The overheat protection manager prevents the pump from overheating by?
Dumping water from the pump onto the ground
The gradually increasing size of the waterway ________ the velocity of the water thus enabling the pressure to ___________ proportionally
Decreases and build up
On a centrifugal pump water enters the impeller through the ?
Eye
At sea level the pump can theoretically lift water how high?
10m
What is the difference between vanes and valutes?
Vanes transmit motion to the water, volutes carry the water away from the impeller/pump
Most CFD apparatus have a water capacity of how many litres?
2500L
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
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
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
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
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
What is a polar solvent?
Mixes readily with water. Ex. Acetone, isopropanol, methanol, alcohol
Polar solvents destroy regular foams
What is a hydro carbon?
Does not mix readily with water
Ex diesel, gasoline, oil
Dumping the tender by pumping it out through a hose is more efficient than using the dump valve? True or false
False
A dry hydrant for drafting is a hydrant that?
Is used for drafting from a static supply
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
To increase shuttle efficiency FF should do what?
Maintain training on filling and dumping tenders
The priming pump is what kind of pump?
Positive displacement pump
When filling the booster tank be sure not to do what?
Cavitate the pump
The relief valve on the TFT in valve is set to activate at what pressure?
1260kPa or lower
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
Filling and dump sites should be planned to allow for?
Continuous forward motion
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
After bringing on a hydrant operators need to do what three things?
Mark the compound gauge
Close the tank to pump
Open tank fill
Centrifugal pumps take advantage of incoming pressure and add to it? True or false.
True
before charging any lines, operators must ensure what?
The nozzle FF is ready for water
What are the four aspects of the foam tetrahedron
Water
Air
Foam concentrate
Mechanical agitation
How does foam help to extinguish and/or prevent the ignition of class B materials?
Separating
Cooling
Suppressing (smothering)
When using multiple tanks at a dump site the goal is to?
Keep the pool at the attack engine the fullest
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
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
Flow meters are accurate to +/- what percent?
3%
What is the definition of specific gravity?
The density of liquids in relation to water
some fire apparatus have multiple impellers, each impeller is commonly referred to as what?
Stages
What is the definition of a master stream?
Answer had something to do with not being able to be controlled without mechanical aid
What is the definition of altitude?
Is the position of an abject above or below sea level
What is the appropriate foam eductor setting for a deep hydro carbon spill?
3%
what is the appropriate foam eductor setting for a shallow hydro carbon spill?
1%
Who determines the need to set up relay/drafting operations?
Incident commander
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
What is the purpose of a relief valve
Relieves excess pressure before damaging the pump
What part of the pump adjust the engine RPM to compensate for fluctuations in pressure?
The pressure sensing governor (or just governor)
What is the percentage of water in water foam mixtures?
94-99%
Three statements about foam, choose the correct statement..
One of the correct answers is that there are two basic types of foam
You are flowing 700lpm with a 44mm handline through five 15m lengths of 44mm hose. What is your pump discharge pressure?
1100kPa
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
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
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
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
Use the formula FL/L = (Q/100)^2 x C
Values
65mm hose flowing 2000lpm
C for 65mm hose is .8
L = 30m
320
Use the formula FL/L = (Q/100)^2 x C
Values
44mm hose flowing 700lpm
C for 44mm hose is 6
L= 30m
294
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
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
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
What is the appropriate foam eductor setting for a polar solvent spill?
3%
What pressure is added for a high-rise system when calculating pump discharge pressure?
150kPa
There was a questions about what impacts FL in a high-rise standpipe system
Answer was all of the above for me
What is the coefficient of friction for a 77mm hose?
0.4
What is the coefficient of friction for a 65mm hose?
0.8
What is the coefficient of friction for a 44mm hose?
6
What is the coefficient of friction for a 125mm hose?
0.03
What is the optimum nozzle pressure for a solid bore handline (highlighted in green)?
350 kPa
What is the appropriate foam eductor setting for a deep hydrocarbon spill?
3%
a relay pump supplying 125mm hose rated to 1400 kPa cannot exceed what discharge pressure?
1260kPa
When pumping in a relay (as well as from a hydrant) the residual incoming pressure should not drop below what?
150 kPa
What is the “EP” on a 20 story high rise building (4m/floor) with a fire on the 13th floor?
480 kPa
Use the formula PDP = TFL + APP +/- EP + NP
What does EP stand for?
Elevation pressure
What is the pump discharge pressure for a high-rise fire on the 36th floor?
2340 kPa
What is the initial pressure setting on the supply truck during a relay, then what is it increased to?
350 kPa and 800 kPa
How many plum must a engine be flowing in order to account for the friction loss of an appliance?
1400 lpm or more
How much pressure is added to compensate for the friction loss of an appliance?
70 kPa
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
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
What is the FL per length of 65mm hose flowing 1400 lpm?
85kPa
What pressure does 44mm leader line operate at?
950 kPa
What pressure does a 44mm jump line operate at?
650 kPa
What pressure does a 65mm leader line operate at?
510 kpa
What pressure does a 65mm leader line with a blitz fire on “low” setting operate at?
790 kPa
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
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
After bringing on the hydrant operators need to _____ the compound gauge, ________the tank to pump valve and ______the tank fill valve
Mark, close, open
Direct pumping is performed when? (Drafting)
Minimal water is required
