Powerplant IV Mod 3 and 4 quiz

Turbine Engine Inlet Systems/ Engine Exhaust Systems

What is the effect of a blocked inlet screen on a turbine engine?

Decreased engine performance

What is the function of a variable geometry inlet in a turbine engine?

 

To adjust the shape of the inlet for different flight conditions

In which type of engine are inlet screens generally not used?

 

Turbofan engines with steel or titanium compressor blades

What is the purpose of a compressor inlet screen?

 

To prevent FOD ingestion

What is the main objective of a bellmouth inlet?

 

To obtain high aerodynamic efficiency

What is the purpose of the inlet cowl on a turbofan engine?

 

To provide an airflow path into the engine

What is the function of deflector doors in engine inlets?

 

To deflect ice and dirt away from the intake

What is the primary source of thrust in a high-bypass engine?

 

The secondary airstream

What is the function of the fan hub or spinner in a high-bypass engine?

 

To provide warm bleed air for anti-icing

What is the function of the abraidable rub strip in a high-bypass engine?

 

To allow the fan blades to rub during flightpath changes

What is the purpose of a cabin heater exhaust shroud?

 

To induce airflow through the exhaust ejectors

What is the purpose of an exhaust system on a reciprocating engine?

 

To dispose of exhaust gases with safety

Which type of exhaust system is typically used on modern aircraft?

 

Collector system

What material is the exhaust collector ring typically made of?

 

Corrosion-resistant steel

What is the purpose of the augmentor vane actuator on a radial engine?

 

To control vane positions

What are the primary inspection areas of three types of exhaust systems?

 

Exhaust gas leakage, external surfaces, and internal baffles

What is the importance of regular inspections for exhaust systems?

 

To prevent carbon monoxide hazards

What is the best approach for inspecting an inaccessible component of an exhaust system?

 

Remove the component and check for leaks

What are the potential consequences of using galvanized or zinc-plated tools on an exhaust system?

 

Cracks and eventual failure

What is the purpose of a converging nozzle in a turboprop engine?

 

To increase the velocity of the exhaust gases

What is the purpose of an insulating blanket on an exhaust nozzle assembly?

 

To shield the surrounding area from high heat

What is the purpose of the convergent component of the exhaust nozzle?

 

To increase gas velocity

What is the purpose of the exhaust nozzle in an aircraft engine?

 

To provide increased thrust

What is the term used to describe the pressure difference between the inside of the nozzle and the ambient air?

 

Pressure thrust

What is the purpose of locking the thrust reverser system in the stowed position?

 

To prevent deployment during maintenance