Fire Apparatus Engineer (FAE) Illinois Exam | Updated and Verified Questions and Answers

Fire Apparatus Engineer (FAE) Illinois Exam | Updated and Verified Questions and Answers Over Heating -Circulate tank water -Crack unused port & open Drain. Wear caused by debris & deposits in the water -Flush hydrant Cavitation - ansThree ways to damage a pump Uses the vacuum in the intake manifold on a gasoline engine. Obsolete with diesel engines - ansVacuum Primer This Primer operates on the same principle as a foam eductor. The exhaust gases are diverted to a chamber where the velocity of the gases passing through a venturi creates a vacuum. Check valves prevent explosive gases from the exhaust system from entering the pump & keeps water from entering the exhaust system. - ansExhaust Primer Power -Electrically driven -Driven from the pump transmission. Internal Gears Drive Belt Used on Large capacity pumps. - ansRotary Gear pump Eccentric position of rotor. Vanes are free to move within the mounting slot Electric motor most popular power to drive this primer Most commonly used priming pump. Uses priming oil in the system. - ansRotary Vane Oil Reservoir must be at least 4 quarts. (SAE 30) good for 8 to 10 primes Minimum of one 2-1/2" gated intake Equipped with locks - ansDischarge/Intake valves 4-1/2" for 750 GPM pump 5" for 1000 GPM pump 6" for 1250 GPM pump or greater - ansIntake Sizing RPM Governed RPM plate at engineers panel - ansTachometer Atmospheric pressure = 14.7 psi 1 psi will raise a column of water 2.3 feet 14.7 psi x 2.3 ft/psi = 33.9 feet 34 feet Theoretical maximum lift - ansTheoretical Lift(drafting) 22 in of mercury 22 in x 1.13 ft/in = 25 feet cut capacity to 250 GPM lifts over 20 ft should not be attempted Pumps will produce rated capacity up to 10'(feet) of lift capacity is reduced due to lift and friction loss in the hard suction hose - ansWhat is Primer pump rated at?(drafting) Loss of pressure created by the turbulence of water moving against the inferior walls of the hose or pipe. - ansFriction Loss 1. FL varies directly with the quantity of water flowing. -( the larger the quantity the higher the FL-Same size hose.) 2. FL varies directly with the size of the hose. -(the larger the hose the lower the FL-same quantity.) 3. FL varies directly with the length of the hose. -(the longer the hose the higher the FL-same quantity.) 4. FL will stay the same regardless of the pressure as long as the flow is the same. - ans4 Hydraulic Laws of Friction Take Static pressure and subtracting residual pressure which gets you your drop. Take your drop and multiply it by (2)² for second line, (3)² for third line, (4)² for forth line, (5)² for fifth line. so long as after you multiply drop and the multiplayer for the number line and still have 10 psi left based off static pressure you can have that many lines if you have less than 10 psi you can not operate that number of lines. - ansHow to calculate psi loss for each additional line off hydrant and know how many lines can be taken off hydrant? Example: Static pressure: 65 psi Residual pressure : 60 psi Drop: 5 psi 2nd line: 2²=4: 4x5= 20 3rd line: 3²=9: 9x5= 45 4th line: 4²=16: 16x5= 80 This line can't be done because it is over 65 psi - ansExamples of how to calculate psi loss for each additional line off hydrant 1. 2 Hour: 100% @ 150 psi 2. 1/2 hour: 70% @ 200 psi 3. 1/2 hour: 50% @ 250 psi 4. 10 minutes: 100% @ 165 psi (overload or spurt test) - ansWhat are all the steps in Certification Test (pre-service tests)? 100% @ 165 psi (done in certification test for 10 minutes) - ansWhat is a Spurt or Overload test? 1. 20 minutes: 100% @ 150 psi 2. 10 minutes: 70 % @ 200 psi 3. 10 minutes: 50% @ 250 psi Optional: 100% @ 165 psi (overload or spurt test) - ansWhat are all the steps in a Service Test? 100% capacity @ 150 psi net pump pressure 70% capacity @ 200 psi net pump pressure 50% capacity @ 250 psi net pump pressure - ansWhat are Pump Tests? Net Pump Pressure (NEP) is the measurement of the total work performed by the pump: a. To lift water into the pump (drafting) b. To discharge water from the pump NEP= Suction Side Work(drafting) + Discharge Side Work - ansWhat is Net Engine/Pump Pressure (NEP)? Examples: Discharge gauge reads 165 psi but you are getting supplied by hydrant @ 65 psi on your intake gauge. So the net pressure would only be 100 psi. Now your are drafting and Intake gauge reads 20" mercury (-20) and Discharge reads 120 psi. So your net pump pressure is 140 - ansExamples of figuring out Net Engine/Pump Pressure (NEP) Pump Discharge Pressure (PDP) is: PDP= Net pump pressure(NEP) - Suction Side Work - ansWhat is Pump Discharge Pressure? Suction Side Work(psi)= Lift (ft)+Intake Hose FL(Friction Loss) (psi) Divided by 2.3 - ansHow do you figure out Suction Side Work ? 100 psi - ansWhat is Fog nozzle pressure for Hand held nozzle and Master Stream? Hand Held : 50 psi Master Stream: 80 psi - ansWhat is Smooth Bore nozzle pressures for Hand held nozzle and Master Stream? "For every action there is an equal and opposite reaction" - ansWhat is Newton's Third Law of motion pertaining to Nozzle Reaction?