Jet Engine Performance Quiz
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Questions and Answers

What typically influences the value of the minimum idle speed?

  • The design of the throttle lever
  • The fuel type used
  • The ambient pressure only
  • The type of engine (correct)

Which component compares the actual N2 with the idle demand signal?

  • The throttle lever
  • The metering valve
  • The fuel control unit (correct)
  • The pneumatic system

How is thrust affected by ambient conditions?

  • Thrust increases when ambient temperature rises
  • Thrust remains constant regardless of ambient conditions
  • Thrust decreases when ambient pressure rises
  • Thrust changes with fluctuations in ambient temperature and pressure (correct)

What signal does the fuel control unit receive to balance thrust changes due to engine bleed air supply?

<p>Compressor discharge pressure (CDP) (C)</p> Signup and view all the answers

What happens to idle thrust as ambient temperature increases?

<p>Idle thrust decreases (D)</p> Signup and view all the answers

What is the primary purpose of the fuel control unit?

<p>To meter fuel for all operating conditions of the engine (C)</p> Signup and view all the answers

Which of the following describes steady state operation?

<p>Engine speed is maintained at a constant rate (C)</p> Signup and view all the answers

Idle speed control primarily relies on which signal?

<p>Thrust lever position (C)</p> Signup and view all the answers

Which operational condition is considered transient?

<p>Deceleration (A)</p> Signup and view all the answers

What is the challenge of fuel metering during transient operations?

<p>Changing speed while ensuring safety and efficiency (D)</p> Signup and view all the answers

Which of the following is NOT a limit that the fuel control unit must ensure during operation?

<p>Fuel efficiency limit (D)</p> Signup and view all the answers

Which operating conditions are considered steady state?

<p>Idle and constant speed operations (C)</p> Signup and view all the answers

What does the steady state curve represent?

<p>Fuel demand based on engine speed (C)</p> Signup and view all the answers

Flashcards

Minimum Idle Speed

The lowest engine speed at which the engine can operate stably and supply minimum thrust.

Idle Speed Variation

The engine speed depends on the engine type and is typically between 50% and 65% N2.

Thrust Changes

Engine thrust can vary due to ambient conditions (temperature and pressure) and bleed air for pneumatic systems.

Fuel Control Unit Compensation

The fuel control unit adjusts fuel supply to compensate for thrust changes caused by ambient conditions and bleed air.

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Compressor Discharge Pressure (CDP)

The pressure at the discharge of the compressor, which is used by the fuel control unit to detect bleed air usage.

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Fuel Control Unit Purpose

Meter fuel needed for all engine operational conditions (starting, idle, acceleration, constant speed, deceleration, shut-down).

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Steady State Operation

Engine speed or thrust remains constant during operation.

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Transient Operation

Engine speed or thrust increases or decreases during operation.

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Steady State Fuel Metering

Simple; fuel control unit supplies fuel to maintain the set engine speed.

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Transient Fuel Metering

More complex; fuel control unit must adjust fuel quickly and safely, avoiding operating limits.

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Operating Limits

Maximums for engine temperature, speed, compressor stall, and flameout.

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Idle Speed Control

Controlled by the fuel control unit in response to the thrust lever position.

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Idle Speed Importance

Lowest operating speed of an engine, needs to be low enough to save fuel and high enough to provide taxi thrust.

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