GTS Mod 6 Difficult
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Questions and Answers

What is the purpose of the High Energy Ignition Unit (HEIU) in a gas turbine engine system?

  • To regulate power from the battery bus
  • To dissipate energy as high-voltage, high-amperage discharge across the igniter plug (correct)
  • To control the voltage supply from the engine starting system
  • To store electrical energy until a predetermined value is reached

    • Which type of ignition system receives power from the aircraft AC bus?

  • High tension current system (correct)
  • Intermittent duty cycle system
  • Continuous duty cycle system
  • Low tension current system

    • What does the term 'duty cycle' refer to in the context of ignition systems?

  • The type of voltage supply controlled by the engine starting system
  • The time limit placed on the operation of the ignition system (correct)
  • The dissipation of electrical energy in the HEIU
  • The position of igniter plugs within a combustion chamber

    • Where does a low tension current system receive its power from in a gas turbine engine?

    <p>Battery bus</p> Signup and view all the answers

    What are the two common types of gas turbine ignition systems mentioned in the text?

    <p>Low tension (DC voltage) and high tension (AC voltage)</p> Signup and view all the answers

    How do igniter plug types vary between engine designs?

    <p>Based on their position within a combustion chamber</p> Signup and view all the answers

    What is the purpose of a continuous duty cycle ignition system in an aircraft?

    <p>To provide continuous engine relight capability during critical flight manoeuvres</p> Signup and view all the answers

    In what situations would aircrew typically select just one igniter plug?

    <p>During cruise flight when delayed engine relight is not critical</p> Signup and view all the answers

    What is a common feature of both AC and DC igniter systems?

    <p>They contain similar components</p> Signup and view all the answers

    Why are gas turbine engines typically equipped with a dual high energy ignition system?

    <p>To provide redundancy in case one system fails</p> Signup and view all the answers

    Which component of an ignition system is responsible for controlling the flow of high energy current to the igniter plugs?

    <p>Ignition relay</p> Signup and view all the answers

    What is the main difference between a DC bus and an AC bus ignition circuit breaker?

    <p>Operating voltage</p> Signup and view all the answers

    What is the duty cycle of the ignition system based on the information provided?

    <p>2 minutes on, 3 minutes off</p> Signup and view all the answers

    At what RPM range does the ignition system operate continuously according to the text?

    <p>16% to 65%</p> Signup and view all the answers

    What happens when the engine speed goes above 65% based on the information provided?

    <p>The ignition system is de-energized</p> Signup and view all the answers

    What component connects the HEIUs to the igniter plugs according to the passage?

    <p>High tension ignition leads</p> Signup and view all the answers

    Which type of current is used to supply ignition voltage through the high tension ignition harness?

    <p>High tension current</p> Signup and view all the answers

    What does the diode in this figure represent in the context of the ignition system operation above 65% RPM?

    <p>One-way valve</p> Signup and view all the answers

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