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turbine ignition
2207 Rodina
| Question | Answer |
|---|---|
| The turbine engine ignition system requires timing to spark during an exact point in the operational cycle. True or False | False |
| Usually a turbine engines ignition is continuous. True or False | False |
| A continuous ignition that is used at a ______ voltage and energy level, are used for certain flight conditions. | lower |
| What are the critical flight modes that use continuous ignition? | take off, landing, and when encountering significant turbulence or precipitation. |
| Most gas turbine engines are equipped with a ____ energy, _______ -type ignition system and are air cooled by _________ | high, capacitor, fan airflow |
| The typical turbine engine is equipped with a _______ -type or capacitor discharge, ignition system consisting of _____ identical independent ignition units operating from a common _____ voltage power source | capacitor, two, DC |
| Since turbine engines often operate in the low temperatures of ;high altitudes, the system must be capable of supplying a ______ heat _______ spark | high, intensity |
| A high voltage is supplied to arc across a _______ igniter spark gap, providing reliability under varying conditions of ____________________, fuel vaporization, and input _______ | wide,------ altitude, atmosphere, pressure, and temperature------voltage |
| A typical ignition system consists of | a. two exciter units b. two transformers c. two intermediate leads d. two high-tension leads It is called a dual system. |
| The older style capacitor type turbine ignition system passes the elec energy through a filter to prevent ______ voltage from being introduced into the aircraft ________ system | noise, electrical |
| The storage capacitor assumes a charge, up to a max of 4 ______and is connected to the _______ ignitor through the ________ and a contactor, normally open. which is closed by a single-lobe ________ | joules, spark, triggering transformer, cam |
| The spark rate at the spark igniter varies in proportion to the _______ of the DC power supply that affects the rpm of the ________ | voltage, motor |
| This concentration of max energy in minimum time achieves an optimum ________ for ignition purposes, capable of blasting ______ and vaporizing globules of _______ | spark, carbon deposits, fuel |
| The exciter is hermetically sealed, to ensure shielding against ___________ of high-________ voltage interfering with the ________ reception of the aircraft. | leakage, -frequency, radio |
| A capacitor discharge exciter unit provides ignition for turbine engines, it is required only for __________ the engine, once combustion has begun, the flame is _________. | continuous |
| The energy is stored in __________ Each discharge circuit incorporates __________ storage capacitors. The voltage across these capacitors is stepped up by ____________ units | capacitors, two, transformer |
| The discharge of the second capacitor is of ________ voltage, but of very _______ energy | low, high |
| the result is a spark of great heat intensity, capable of igniting ________ and burning _____________ on the plug electrodes. | abnormal fuel mixtures, foreign deposits |
| The exciter is a _______ unit that produces sparks at each of the _______igniter plugs | dual, two |
| The plugs ___________ fire while the engine is operating other than on continuous ignition for certain flight conditions. | do not |
| The plugs of a turbine engine ignition system are different from a spark plug of a reciprocating engine, the electrode must withstand a ________ much higher. | current |
| The high energy current can quickly cause electrode _________ but the short periods of operation minimize this | erosion |
| Why are the electrode gaps of an igniter plug much larger than that of a spark plug? | the operating pressures are much lower & the spark can arc more easily |
| How is electrode fouling minimized on an igniter plug? | by the heat of the high-intensity spark |
| An annular gap igniter plug is referred to as a __________ reach igniter because it ________ slightly into the combustion chamber liner to produce a more effective ___________. | long, projects, sparks |
| The constrained gap plug operates at a much cooler temp because it _________ project into the combustion chamber liner. The spark arcs _________ the face of the combustion chamber liner. | does not, beyond |
| What does the inspection of the ignition system include? | a. ignition lead terminal inspection arcing, carbon, cracks on the ceramic terminal b. grommet seal free of flash-over and carbon c. wire installation free and no signs of arcing d. system for security of component mounting and connectors |
| How is the system operation checked? | listening for a snapping or popping noise as the engine begins to tarn, also by removing & doing the starting cycle to check |
| Ignition leads may be cleaned with? | dry cleaning solvent |
| Why must you wait at least one minute before disconnecting the high voltage cable from the igniter? | to permit the stored energy to dissipate |
Created by:
Lucas1999