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Powerplant
study guide power plant
| Question | Answer |
|---|---|
| a condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is | hydraulic lock |
| what is the purpose of a turbine engine deaerator in an oil tank? | separating aerated oil from the scavenge pick up |
| when installing a magneto on an engine, the piston in the #1 cyclinder must be | before TDC on compression choke |
| What is not a function of bleed air | Actuator |
| a fuel flow transmitter indicates | pounds per hour |
| what destroys vortices that would otherwise suck debris from the ground into engines mounted in pods low to the ground | vortex dissipater |
| what does vortex dissipater do? or what is the purpose of a vortex dissipator | destroys vortices that wold otherwise suck debris from the ground into engines mounted in pods low to the ground |
| carburetor icing is most severe at | air temperature below 32 degrees |
| a type of propeller vibration in which the ends of the propellerblade twist back and forth at high frequency, around an axis perpendicular to the engine crankshaft is known as what? | fluttering |
| how does hydro-matic propeller operate? | it works similarly to a constant speed/variable pitch propeller but without counterweights. oil pressure and centrifugal twisting moment are used to turn the blade. it has a larger blade angle range and double acting hydraulic power. |
| which part of an aircraft in fligh will accumulate ice first | fuel discharge nozzle |
| turbine engine pressure ratio EPR indicator compares which two pressures? | compressor and turbine wheel |
| what is the benefit of using a hydraulic power pack? | it makes the hydraulic system light weight |
| part of the ADF system used on aircraft includes | sense and loops antennas |
| when the CSD and the alternator are contained within one unit, the assembly is known as | IDG (Integrated Drive Generator) |
| a safety feature usually employed in direct cranking electric starting systems that is used to disengage the starter drive from the engine drive is the | automatic release clutch assembly |
| which of the following has a direct effect on generator output | strength of magnetic field |
| centrifug twisting force causes the propeller to | move into low pitch |
| which statement is correct regarding engine crankshafts | dynamic dampers ar eincorporated on the crankshaft to reduce vibration |
| how does CO2 extinguish fire? | by diluting the atmosphere with an inert agent that does not support combustion |
| what is the probable cause when the starter switch to the aircraft gas turbine starter-generator is energized and the engine fails to rotate? (defective solenoid is the typical cause) | sheared starter drive coupling |
| the primary source for oil contamination in a normally operating reciprocating engine is | carbon deposits from combustion blow by |
| which of the following are used to prevent carburetor icing? | heated induction air |
| a low-tension circuit is prefered because of | high amps and low volts |
| the purpose of an aftercooler used with turbo chargers to cool | air entering the induction system from the turbo charger |
| a common cause of waste gate malfunction is | coke deposits or carbon buildup |
| which should be accomplished during installation of aircraft wiring? | prevent chaffing damage by attaching the bundle to a structure. |
| when using a turbine engine oil analysis program, which of the following is true | identify and measure particles in parts per million (PPM) by weight |
| spark plug "heat range" refers to the classification and is determined by | its ability to transfer heat to the cylinder head |
| which of the following conditions occur when an excessively rich fuel mixture enters the combustion of a turbine engine | hard start |
| when performing a runup on a turbo jet or turbo fan engine the exhaust hazard area extends aft of the engine approximately | 200ft |
| which of the following could an A&P rated mechanic overhaul? | float type carburetor |
| exhaust system components repairs | cannot be performed in the field |
| axial flow compressor blades are made from | stainless steel |
| an aluminum propeller has damage in a repairable area (zone) the is not on the leading or trailing edge, uses which method to repair? | flat and round file |
| an out of balanced, single wood propeller may be out of balance due to | spinner assembly |
| what is the typical expansion space of an oil tank for the APU | 10% |
| what is a data speed plate used for? | comparison of current performance thrust to original performance thrust (at sea level) |
| what is the primary purpose of valve overlap? | volumetric efficiency |
| an unbalanced wood compressor would cause | vibration in the airframe |
| which of the following is true regarding a 4-stroke cycle | exhaust valve opens on the power stroke and intake valve closes on the compression side |
| one function of the nozzle diaphragm in a turbine engine is to | direct the flow of gasses to strike the turbine blades at a high angle |
| on an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected? | remove the complete exhaust or exhaust shroud removed |
| service the oil tank of the APU when the engine is | shut off |
| if an aircraft engine and propeller are completely submerged in water, what should be done | disassemble and spray on a corrosion inhibitor. |
| in a reciprocating engine, how is the ignition switch different from other types of switches? | the off position completes the circuit through the switch to ground |
| gear type and rotor engine oil pumps are both | positive displacement |
| what is the fuel/mixture of 11:1 | this normally refers to 1 part fuel and 11 parts air |
| how is a piston measured | at zero ( if talking about stroke) |
| the beta range of a propeller is considered to be at what blade angle. | below flight idle |
| what condition indicates a hung start | the engine lights off,,but the engine will not accelerate to idle |
| which of the following is a function of the carburetor venturi? | measures the air. (restricts air) |
| an advantage of an axial compressor is | small frontal area for given airflow |
| when should combustion be complete? | slightly past TDC |
| a pure turbo jet engine achieves thrust by | imparting greater acceleration to a similar quantity |
| a cause for oil pressure to be 0-normal is | air in the lines leading to the gauge |
| prolonged idling of an engine will usually result in | fouling of spark plugs |
| what type of vibration, in which the ends of the propeller blades twist back and forth at a high frequency around an axis perpendicular to the engine crankshaft? | fluttering |
| in some reciprocating aircraft engines, the hopper in the oil tank is used for | speeding up dilution |
| thrust reversers are operated | mechanically |
| propeller auto-feathering system, when armed, will feather | only one propeller |
| during maintenance run, the fuel mixture at rated power in air cooled reciprocating engines is | richer than the mixture used for cruise |
| The majority of reciprocating engines are cooled by | forced ambient air |
| Which type of air entrance is used on high bypass turbo fan engines | divided entrance |
| What type of ignition system is on a turbine engine | capacitor |
| Turbine engine fuel controls schedule fuel delivery to match power settings used many different inputs including | compressor discharge pressure |
| What do you do to an engine that was submerged in a flash flood | disassemble clean and resassemble with corrosion resistant compound |
| Aircraft certified under part 91 operating as a flight for hire requires what type of inspection | 100 hour |
| Epr parentheses engine pressure ratio on parentheses is calculated at | atmospheric temperature (sea level) |
| What is the purpose of a propeller Governor adjustable stop | limit maximum engine speed |
| Carburetor heat is not generally used on takeoff and let's it's absolutely necessary because of the | loss of power due to decreased volumetric efficiency |
| Shrouds on a turbine blade with axial flow | reduce friction |
| Compare a pure Turbo jet to a Turbo fan the Turbo fan generate relatively slower acceleration too | Larger quantity of air |
| Free turbines normally started with propeller control lever in what position | Feather |
| Turbojet and Turbo fantrust reverser systems can be activated by hydraulic or | Pneumatic pressure |
| Preignition may be caused by | Worn valves |
| What is the maximum numbers of bonding wires that can be attached to one stud | 4 |
| The procedure for removing the accumulation of dirt deposits from the compressor blades is called | Grit blasting |
| The circuit breaker or fuse should open the circuit before the conductor events smoke. How is this accomplished? The time/current characteristic of the protection device must | Must fall below that of associated conductor |
| Aluminum propeller blade failure at the sight of an unrepaired Nick or scratch is usually the result of | Stress concentration |
| Which of the following actions should be taken when a reciprocating engine and propeller have been recovered from a partial or total immersion in standing water or Flash floods | Engine parts and accessories should be removed and allowed to air dry |
| What should be used to clean ceramic coated exhaust stacks | Degreaser |
| High toothbrushes and high rubbing velocity such as occur with spur type gears require the use of | An extreme pressure (EP)lubricant |
| The purpose of a deaerator tray in a turbine engine oil tank is to provide | Separation of air scavenged oil |
| Proper operation of electric deicing boots on individual propeller blades may be best determined by | Ensuring that the timer operates continually for 2 minutes |
| To unfeather a propeller | Start the engine and allow propeller governor to pump out the oil |
| Where are the main oil filters on a reciprocating engine located in the system | After the prefer pressurized pump |
| Fuel is discharged for idling speed on a float type carburetor | From the idle feed passage. Or the idle ports |
| On a carburetor with an AMC, as you climb to altitude | The needle will move back, allowing more fuel |
| What are 3 main regulating components of a ground (sea level)boosted Turbo system | Exhaust bypass assembly, density controller and differential pressure controller |
| Fixed pitch propeller is removed because of sudden stoppage. The propeller, cone and hub should be examined for | Proper torque |
| Which statement is correct regarding engine crankshafts | Dynamic dampers are incorporated on the crankshaft to reduce vibration |
| What do cascading veins in the thrust reverser have to do with the combustion section | Prevent it from entering the combustion chamber also called cold steam type reversal |
| Which of the following is an input parameter for a turbine engine control unit | Compressor inlet pressure |
| Designated areas, including the engine power section, engine accessories section, apu compartments, and any fuel burning heater installations, are known as | Fire zones |
| Replacing multi conductor cables with other than original manufacturer cables could result in | Complications with servicing aircraft |
| The gap setting on a spark plug should be checked with a | Round wire thickness gauge |
| How should the exhaust system be inspected on an aircraft that uses an exhaust heat exchanger as source of cabin heat | Remove the muffler heater air shroud |
| What stage in a turbine engine is gas pressure greatest | Compressor outlet |
| In a reciprocating engine, if air flow becomes clogged, what is the alternate way of supplying air | Alternate air door |
| Which is correct relating to a fuel level check of a float type carburetor | The fuel level must be below the discharge nozzle outlet holes |
| Which of the following in an advantage of fuel injection on a reciprocating aircraft engine | Less danger of fuel system icing |
| Engine vibrations, that are the result of an unbalanced propeller, will usually occur | Throughout the entire RPM range |
| Under which of the following conditions will the trimming of the turbine engine be most accurate | Temperature is corrected to a standard day and aircraft nose pointed into the wind |
| What is the purpose of cones on the propeller | Align prop splines with drive shaft |
| A turbine aircraft fuel flow transmitter is an electrical device that uses a | Turbine |
| An electrically operated explosive device that fires a slug through a breakable disk to release a fire extinguishing agent is | A squib |
| What is a result when moisture has allowed current to burn its way across the surface of a Magneto distributor | Flash over leading to carbon tracking |
| Which of the following conditions may exist on an out of track fixed pitch wooden propeller | Out of balance spinner |
| Aluminum and still propeller blades are usually cleaned by | Washing off with a suitable solvent |
| If there is too much valve clearance | The valves won't open as wide |
| An air/fuel mixture ratio of 11:1 is | One pounds fuel to 11 pounds air |
| When removing a shielded spark plug, which of the following is most likely to be damaged? | Barrel insulator |
| Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blade, may be repaired by 1st | Fine file |
| Power plant instrument range markings show whether the current state of operation is normal, acceptable or | In an unauthorized operation range |
| When a ground incident results in a sudden reduction in engine speed what maintenance action needs to be performed | A thorough external inspection of the engine mount, crank case Kama and no section to determine whether any parts have been damaged. If damage is found that cannot be connected by line maintenance, remove the engine |
| Turning an aircraft engine, always face into the wind, never | If icing conditions exist |
| Which of the following are used to distribute fire extinguishing agents into the engine section | Discharge nozzles |
| What are the 2 main sections of a turbine engine for inspection purposes | Hot and cold |
| What is considered acceptable for return to service after one or more prop blades strike an object at a low engine's RPM | Refer to the manufacturer information |
| After disconnecting and AN or MS electrical connector to prevent unintentional grounding, you should | Mate it to an adjacent connector |
| After disconnecting an AN or MS electrical connector to prevent unintentional ground in, you should | Apply boots or caps for protection |
| In a starter generator system, which could be the result of insufficient air flow through the engine that would require the start to be aborted | Hung start |
| Capacitance after firing of a spark plug is caused by | Return of electric energy stored in capacitor of shielded Ignition wires |
| What is one quality of fine wire electrode spark plugs | Easier to accurately adjust the electrode gap due to the wire being easier to bind |
| Turbine engine trimming should never be accomplished with | Icing conditions present |
| A compression test is done when the piston is | On the compression stroke |
| While inspecting flow engine compressor blades, minor damage is noticed. Can the minor damage be repaired | Yes coma if the damage can be removed without exceeding the allowable limits established by the manufacturer |
| How many tachometers does a helicopter have | 2 |
| When the air intake of a reciprocating engine becomes clogged karma unfilter air flows into the induction system by means of | Alternate air door |
| The purpose of a density controller in a Turbo system | is to limit the deck pressure produced by Turbo at wide open throttle |
| When the propeller blade angle is decreased, the propeller speed will | Increase |
| Designated areas including engine power section, engine accessories section, apu compartment and any fuel burning heater installations are commonly known as | Fire zones |
| Gap setting on a spark plug should be checked with a | Round wire thickness gauge |
| What is the purpose of a dataplate's big check on a turbine engine | Comparison of future thrust requirements at the next test cell check |
| Reciprocating engine exhaust systems are | Normally replaced with a new or reconditioned parts |
| What operates the Beta control level | Linkage operation by the power lever |
| Turbine APU's lubrication systems are required to incorporate an | Oil filter or strainer |
| When replacing multi conductor cables, a standard practice is to use cables with the same wire color sequence to | Prevent complications in subsequent troubleshooting |
| Do much valve Clarence, the vows don't open as wide | And don't remain open as long |
| Spark plug gap erosion has partially been overcome by using | A hermetically sealed resistor in the center electrode |
| Which of the following keeps the propeller in the low pitch position during shutdown after an aircraft Turbo prop engine | Start lock hatch |
| A necessary, during operation, CSD disconnect is usually accomplished by | Switch in the cockpit |
| In A115 Volt system what is the maximum continuous current that can be carried by a single No. 8 copper wire a 120ft routed in free air | 50 amperes (if not an option choose 70) |
| What retains the nitrogen cage in an HDR container | Frangible disk |
| Which of the following is not used to detect fires in reciprocating engine nacelles | Carbon monoxide detectors |
| In a variable displacement pump internal leakage keeps pump housing filled with fluid. How is the leakage returned | It does not return to the system |
| What is a rotary vane turbine engine | Combines positive displacement with continuous combustion to achieve the best of the efficiency and performance advantages of piston engines and gas turbines |
| Transfer heat from the cylinder on an air cold reciprocating engine is by | Use of cooling fins on the cylinder head |
| The purpose of cascade vanes in a thrust reversing system is to | Direct the fan air flow forward to slow the aircraft |
| What is the purpose of an accumulator in a constant speed propeller system | Unfeathering |
| What happens to the compressor of air as the accelerates rearward in axial flow turbine engine | It decreases |
| What are the effects of water in a Magneto ignition system | Carbon arching which is caused by Flash over and results in cylinder misfire |
| What causes Ignition in a diesel engine | Compression |
| During the replacement of wiring you should | Refer to current regulations or approved service bulletin |
| Pneumatic starters incorporated safety feature should the clutch not release. It's called a | Drive shaft sheer coupling |
| Which of the following does a fuel totalizer provide | Fuel flow rate measured in pounds |
| Volumetric efficiency and a reciprocating engine will decrease with | Incomplete scavenging |
| Calculations for EPR include turbine discharge pressure, compressor inlet temperature and | Ambient air temperature, corrected barometric pressure. Could say corrected at sea level |
| When performing a Magneto check, the RPM and pitch should be at what setting | When performing a Magneto check, the RPM and pitch should be at what setting The controllable pitch propeller should be set at the minimum pitch angle and the engine for 50 to 65% power |
| Valve assemblies of horizontally opposed reciprocating engines that use a dry sump are lubricated by | Pressure |
| Find wire spark plug electrodes | Bend easier to produce a more accurate gap during gap settings |
| Which engine instrument discrepancies require replacement | Indicator will not stabilize |
| Turbon and 88 0 8 reciprocating. Ingestion of dust | Cylinder wall wear |
| Approximately half of a reciprocating engine exhaust system fails result in areas of stress concentration. The condition is usually caused by | Thermal and vibrational fatigue |
| Synthetic oil turbine engine has 2 principal advantages over petroleum oil reciprocating engine. It has less tendency to deposit lacquer, Coke and | To evaporate solvents at a high temp |
| After coolers when used with a Turbo charger is too cool | Air entering the induction system |
| The purpose of the back section mixture control in a float type carburetor is to adjust the mixture by | Regulate the air |
| Which system most accurately indicates fuel usage of a large turbine engine multi engine aircraft | Fuel flow meter |
| What is used to provide pressure to the variable inlet guide vane actuator or turbine engine compressors | oil |
| What will occur if the vapor vent float in a pressure carburetor loses its buoyancy | The fuel consumption will decrease and cause the engine to run lean |
| Refer to figure 5. Broken #8 wire. All content is missing to # 8 being broken | Combination of starter conditions and Ignition coil conditions |
| What Advantage do mineral based lubricants have overvegetable based lubricants when used in reciprocating aircraft engines | Chemical stability |
| What can be damaged the most when removing spark plugs | Shell |
| Open nuts are used to hold an exhaust system to the cylinders | High temperature self locking nuts. Low torque |
| How does a starter solenoid work | Current flows from the battery to the cylinoid and create a magnetic field inside the cylinoid. The magnetic field closes a high current to engage the motor |
| Thermal efficiency of a turbine engine is affected by | Inlet temperature |
| Is typical Therma couple indicates engine temperature using | Low impedance indicator |
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