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OPERATOR CDC
EXAM
LATEST
In a fire hose, the factor with the greatest impact on friction loss is the
- ANSWERS-Hose diameter You should switch to a pressurized or static water source when your tank reached full - ANSWERS-1/ Hyrdrants with a loop provide the most capacity. T OR F - ANSWERS- True Hydrants without a loop are worse because.... - ANSWERS-There considered a dead end hydrant. They only receive water from one direction. Light blue hydrants (class AA) provide - ANSWERS- 1500 gpm or greater Green hydrants (class A) provide - ANSWERS- 1000 - 1499gpm Orange hydrants (class B) provide - ANSWERS- 500 - 999 gpm
OPERATOR CDC
EXAM
LATEST
Red hydrants (class C) provide - ANSWERS-Less than 500 gpm You should have inches on all sides of the strainer when drafting for optimal use - ANSWERS- 24 You can bypass the 24 inch rule when drafting using a - ANSWERS- Floating strainer A low level strainer should only be used in - ANSWERS-Clean or man made sources of water NFPA states that a pump should have ft of lift using 20 ft of intake hose - ANSWERS- 10 Lifts higher than ft are not practical for drafting ops - ANSWERS- 20 The collapse zone of a structure is equal to - ANSWERS-1.5 times the height END OF PAGE
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OPERATOR CDC
EXAM
LATEST
Friction loss in a standpipe should be calculated at psi - ANSWERS- 10 The steering wheel should not move more than degrees in either direction without turning front wheels - ANSWERS- 10 What is a engine belts proper tension - ANSWERS-1/2-3/4 in at the deflextion point The weekly inspections all involve the - ANSWERS-Pump What do inverters do? - ANSWERS-convert DC to AC power Rescue tools that are hydraulically driven lose significant pressure if the hose lines are.... - ANSWERS-More than 100 ft When are pre service tests performed? - ANSWERS-Before an apparatus is placed into service
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OPERATOR CDC
EXAM
LATEST
Fire pump service tests are performed when? - ANSWERS-Annually Hydrostatic testing is performed at how many psi above the manufactures recommended and for how many minutes - ANSWERS- 50 psi for 10 minutes Pre-service pump certification test are conducted by: - ANSWERS-An independent testing agency This test measures wether the piping between an apparatus water tank and fire pump meets the standard - ANSWERS-Tank to pump flow rate test This test Checks for relationship between discharge pressure, nozzle psi, and engine rpm - ANSWERS-Pump capacity test This test Used to check for leaks in various devices - ANSWERS- Vacuum test
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OPERATOR CDC
EXAM
LATEST
Fire apparatus inverters are limited to - ANSWERS-Less than 1500 watts During the pump test with a pump less than 1500gpm the priming device should create a vacuum in 30 seconds to lift 10ft of water through ft of suction hose - ANSWERS-20ft Tracking engine performance across time uses data collected in the: - ANSWERS-Fuel, oil, and mileage record Indenting three critical items that a fire apparatus daily inspection checklist should have - ANSWERS-Apparatus unit identification number, inspected by, remarks. All pumper apparatus should obtain mph within 25 seconds and have a minimum top speed of mph - ANSWERS-35 and 50 Reaction distance + braking distance =
- ANSWERS-Total braking distance
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OPERATOR CDC
EXAM
LATEST
4 factors that influence stopping a fire apparatus - ANSWERS-Driving surface, speed, weight, and condition of braking system What kind of tanks reduce the effects of liquid surge? - ANSWERS- Baffled tanks Use low gears when... - ANSWERS-Climbing hills, turning corners, approaching intersections, rough terrain, going downhill. Use high gears when... - ANSWERS-Keeping up with traffic When does lugging occur? - ANSWERS-When a Manual transmission is in too high of a gear Before you drive your fire apparatus across a bridge you should? - ANSWERS-Compare the weight of the fire apparatus to the Bridge's capacity. One gallon of water weighs - ANSWERS-8.33 lbs
OPERATOR CDC
EXAM
LATEST
ALL
DENSITY
Elevation of water defines the PSI. A column of water that is 12 inches tall has a psi of - ANSWERS-. Atmospheric pressure at sea level - ANSWERS-14.7 pounds per square inch Does atmospheric pressure increase or decrease as elevation rises? - ANSWERS-Decrease Head pressure is a measurement of - ANSWERS-Force created by the height of water supply above the discharge point To calculate head pressure divide the head height by - ANSWERS-2. What is static pressure? - ANSWERS-Ther avaible pressure at a discharge point without flowing water END OF PAGE
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OPERATOR CDC
EXAM
LATEST
What is residual pressure? - ANSWERS-pressure remaining when water is flowing Flow pressure - ANSWERS-Pressure created from forward velocity ag the charge point Normal operating pressure - ANSWERS-water pressure in a distribution system during regular consumption How do you calculate friction loss when GPM is increased? - ANSWERS-You square the GPM increase amount. Ex) if you doubled the GPM the friction loss would quadruple. 2 squared = 4. If you have a hose with a GPM of 100 and a friction loss of 10 and the GPM doubles. What's the new friction loss? - ANSWERS-40 psi As hose diameter increases what happens to friction loss? - ANSWERS- Friction loss decreases.
OPERATOR CDC
EXAM
LATEST
Pressure in a container is in all directions included upwards - ANSWERS-Equal The pressure of a liquid in an open container is to the density of the liquid - ANSWERS-Proportional What's the density of water? - ANSWERS- 1 Flow velocity is measure in - ANSWERS-Ft/second Valves are placed strategically to isolate sections for - ANSWERS-Repairs Why should distribution systems provide hydrants with water from more than one direction? - ANSWERS-More reliable You should take precautions to avoid back flow of non potable water into what kind of water system? - ANSWERS-Munincipal END OF PAGE
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OPERATOR CDC
EXAM
LATEST
What is a straight stream (smooth bore) nozzle pressure? - ANSWERS- 50 What is a straight master streams nozzle pressure - ANSWERS- 80 psi Fog nozzle handline nozzle pressure - ANSWERS-100psi The chimney nozzle has a flow rate of psi at only 1.5- 3 gpm - ANSWERS-100psi Piercing nozzles have a flow rate of gpm - ANSWERS- 100 A elevated master stream cannot be moved laterally during discharge. T or F - ANSWERS-T Calculating appliance pressure is only necessary for flows over gpm - ANSWERS- 350
