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50 Cards in this Set
- Front
- Back
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What is used as the rectifier to produce direct current in a DC generator? |
Brushes and a commutator.
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How does a vibrator–type voltage regulator control the output voltage of a DC generator?
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When the voltage rises above the regulated value, the relay inserts a resistor in the generator field circuit. |
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What three things must be synchronized before a three–phase AC generator can be connected to a bus that is being served by another generator?
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voltage frequency phase rotation |
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How is the direction of rotation of a DC electric motor reversed?
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Reverse the polarity of the armature or the field, but not both
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What is used as the rectifier to produce direct current in a DC alternator?
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Six solid–state diodes
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Why is it not necessary to flash the field of a DC alternator after it has been overhauled?
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An alternators field is already excited by battery current |
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Where are the last chance oil filters located in a turbojet engine?
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located just ahead of the nozzles that spray oil onto the bearings.
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Where is the oil tank in a dry–sump reciprocating engine vented?
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at the engine crankcase.
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What is meant by a hot–tank lubrication system?
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A system in which the oil cooler is located in the pressure subsystem.
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What is meant by a cold–tank lubrication system?
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A system in which the oil cooler is located in the scavenge subsystem.
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What are six functions of the oil in an engine?
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Cleans Lubricates Protects Seals and cushions Removes heat Performs hydraulic action |
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What components in a reciprocating–engine lube system must be inspected on a 100 hr or annual?
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Oil tank oil strainer oil filter oil cooler oil pressure and temp gages entire engine for oil leaks |
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What type of oil quantity indicator is used in most aircraft engines?
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A dipstick that measures the quantity of oil in the tank or sump
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What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft reciprocating engine?
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A magneto has its own source of electrical energy, and doesn't need a battery.
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What is the function of the capacitor in a magneto?
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The capacitor minimizes arcing at the breaker points
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What is the basic difference between a low–tension magneto and a high–tension magneto?
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low–tension ignition system has only one coil in the magneto high–tension magneto produces high voltage in the magneto coil |
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What is checked when a magneto is internally timed?
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Adjusting the breaker points so they will open at the E–gap positionIn
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what position should the ignition switch be placed when using a timing light on the magnetos?
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In the Both position.
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What type of ignition system is used on most turbine engines?
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High–intensity capacitor discharge ignition systems. |
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What is meant by the E–gap in magneto timing?
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The E–gap position is when the primary current flowing in the magneto coil is the greatest.
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What are two types of ignition systems used in turbine engines?
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High–voltage systems low–voltage systems. |
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What malfunction in the ignition system would cause an aircraft reciprocating engine to continue to run after the ignition switch is placed in the Off position?
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The ignition switch is not grounding the magneto primary circuit. |
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What turns on the autoignition system in a turbo–prop engine?
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A torque pressure switch
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What happens when the start switch for a turbine with a starter–generator is placed in the START position?
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Current flows actuates the ignition exciter Current flows through the starter generator and rotates the engine until it starts |
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What prevents too high an air pressure from overspeeding an air–turbine starter?
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Air shutoff valve
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What is adjusted when the fuel control unit of a turbine engine is trimmed?
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idle RPM and maximum thrust RPM |
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What is meant by a duplex nozzle in a turbine engine fuel metering system?
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A duplex fuel nozzle is one that has two fuel discharge passages.
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How does the automatic mixture control in a pressure carburetor keep the fuel–air mixture constant asthe aircraft changes altitude?
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It regulates the air pressure that helps meter the fuel |
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What two things are adjusted when adjusting the idling of a reciprocating engine?
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The throttle stop Idle mixture control |
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What is the significance of the letters that are stamped on the flats of a fuel injection nozzle?
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The letters designate the size of the orifice in the injector nozzle |
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what position is the mixture control placed for starting an engine that is equipped with a pressure carburetor?
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In the Idle Cutoff position.
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In what position is the carburetor heat control placed when starting an aircraft engine? |
In the Cold position.
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What engine parameters are sensed by the fuel control unit of a turbine engine?
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Engine RPM inlet air pressure Inlet air temp compressor discharge pressure combustor pressure
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What are two types of electronic fuel controls for turbine engines?
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(SEEC) Supervisory Electronic Engine Control (FADEC) Full–Authority Digital Electronic Control |
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What is the purpose of the bypass valve in an engine–driven fuel pump?
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The bypass valve allows fuel to flow around the pump for starting and for emergency operation if the pump should fail.
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What are three purposes for the boost pumps in an aircraft fuel system?
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To provide fuel pressure for starting the engine, to pressurize the fuel lines to prevent vapor lock, and to transfer fuel from one tank to another.
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What kind of boost pump is used in most aircraft fuel systems?
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Electronic centrifugal pumps. |
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What is done in most aircraft fuel systems to prevent vapor lock?
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Boost pumps in the fuel tank pressurize the fuel in the lines and force the fuel into the fuel delivery system. |
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What is meant by a compensated relief valve in an engine–driven fuel pump?
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A pressure relief valve that is acted upon by a diaphragm and a spring. |
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What is the purpose of the pressurizing and dump valve in the fuel system for a turbine engine?
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When the engine is shut down, the dump valve dumps all of the fuel from the manifold. |
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What are the two basic types of turbine engine fuel?
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Jet A Jet B |
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What is meant by a compensated fuel pump?
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maintains the fuel pressure a specific amount above ambient air pressure
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What would likely cause a recip equipped with a float carb to hesitate momentarily when the throttle is rapidly advanced from idle to full power?
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Malfunctioning accelerator pump
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Why do aircraft fuel metering systems for recip have mixture controls?
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The mixture control allows the fuel to be decreased or increased due to altitude |
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What are the two types of fuel injection system used on modern recips?
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TCM and Bendix systems
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What is used in the TCM fuel injection system to control the amount of fuel sent to the nozzles?
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Engine speed determines the injector pump output pressure.
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What is used in the Bendix system to control the amount of fuel sent to the nozzles?
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Mass of the air entering the engine
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Where are the fuel strainers normally located in an aircraft fuel system?
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tank outlet lowest point in the system in the carb or fuel injection system |
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What are two types of fuel heaters used in a jet transport aircraft?
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Air fuel Oil fuel |
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What kind of fuel boost pumps are normally installed inside the fuel tanks?
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Electronic Centrifugal pumps |
