Aircraft Engine Performance Quiz

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What is the purpose of adjusting rpm before changing boost when increasing power?

To reduce exhaust gas flow
To prevent Overboost and potential engine damage (correct)
To increase wastegate position
To decrease turbine speed

How does increasing the turbine's speed help maintain steady pressure at the turbocharger outlet?

By closing the wastegate
By diverting more exhaust gas through the turbine (correct)
By decreasing compressor pressure
By opening the wastegate fully

What is the function of the wastegate's position in engine performance?

To increase Aneroid Capsule efficiency
To reduce manifold pressure
To control oil flow
To maintain compressor pressure limits (correct)

Why is the wastegate open before starting the engine?

To allow exhaust gases to flow freely for easier starting (B) Signup and view all the answers

When does the APC close the Bleed Valve after engine start?

When there is insufficient exhaust gas to spin the turbine fast enough (C) Signup and view all the answers

What prompts the wastegate to gradually open during throttle opening?

Increase in compressor pressure (B) Signup and view all the answers

Why does the APC progressively close the wastegate during take-off and climb?

To maintain steady pressure at the turbocharger outlet (D) Signup and view all the answers

Why does the wastegate fully shut at Critical Altitude?

To decrease compressor outlet pressure (A) Signup and view all the answers

What does a drop in compressor outlet pressure at Critical Altitude signify?

Drop in engine power output (B) Signup and view all the answers

What is the purpose of the wastegate in a turbocharger system?

To control the boost pressure (C) Signup and view all the answers

How does an Aneroid Capsule play a role in turbocharger operation?

It adjusts the wastegate position based on pressure changes (B) Signup and view all the answers

In a turbocharger system, what effect does increasing turbine speed have on intake air compression?

Increases boost pressure (B) Signup and view all the answers

What happens to boost pressure if the wastegate remains closed during engine operation?

Boost pressure increases uncontrollably (B) Signup and view all the answers

How does the manifold absolute pressure reading change if the boost pressure exceeds atmospheric pressure?

The MAP reading increases (C) Signup and view all the answers

What role does the turbine wheel play in turbocharger operation?

Converts energy from exhaust gases into mechanical energy (D) Signup and view all the answers

If the wastegate fails to open during engine operation, what impact does this have on engine performance?

Increased exhaust smoke (B) Signup and view all the answers

How does shielding protect a turbocharger from external factors?

By preventing heat and fluid damage (C) Signup and view all the answers

What is the significance of comparing boost pressure and manifold absolute pressure in a turbocharged engine?

To approximate engine power output (A) Signup and view all the answers

What impact does excessive backpressure have on a turbocharged engine's performance?

Diminishes engine power output (D) Signup and view all the answers