III.B.K3 Flashcards
- One function of the nozzle diaphragm in a turbine engine is to?
Direct the flow of gases to strike the turbine blades at the desired angle.
- What is the profile of a turbine engine compressor blade?
A reduced blade tip thickness.
- The fan rotational speed of a dual axial compressor forward fan engine is the same as the?
Low pressure compressor.
- Turbine nozzle diaphragms located on the upstream side of each turbine wheel are used in the gas turbine engine to?
Increase the velocity of the heated gases flowing past this point.
- An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the 1st part of the exhaust duct to?
Increase and the velocity to decrease.
- What is the function of the stator vane assembly at the discharge end of a typical axial flow compressor?
To straighten airflow to eliminate turbulence.
- The turbine section of a jet engine?
Drives the compressor section.
- In the dual axial flow or twin spool compressor system, the 1st stage turbine drives the?
N2 compressor.
8127-1. Which of the following acts as a diffuser in a turbine engine and converts velocity to pressure?
Stators.
- The function of the exhaust cone assembly of a turbine engine is to?
Straighten and collect the exhaust gases into a solid exhaust jet.
- What are the 2 functional elements in a centrifugal compressor?
Impeller and diffuser.
- A turbine engine compressor which contains vanes on both sides of the impeller is a?
Double entry centrifugal compressor.
- Main bearing oil seals used with turbine engines are usually what type?
Labyrinth and/or carbon rubbing.
- 3 types of turbine blades are?
Impulse, reaction, impulse reaction.
- An advantage of the axial flow compressor is its?
High peak efficiency.
- What is one purpose of the stator blades in the compressor section of a turbine engine?
Control the direction of the airflow.
- What is the purpose of the diffuser section in a turbine engjne?
To increase pressure and reduce velocity.
- The diffuser section of a jet engine is located between?
The compressor section and burner section.
- Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by?
Shrouded turbine rotor blades.
- Which 2 elements make up the axial flow compressor assembly?
Rotor and stator.
- The 2 types of centrifugal compressor impellers are?
Single entry and double entry.
- Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called?
Stators.
- In an axial flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to?
Straighten the airflow and eliminate turbulence.
- A purpose of the shrouds on the turbine blades of an axial flow engine is to?
Reduce vibration.
- What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?
Variable guide vanes and/or compressor bleed valves.
- What is the function of the inlet guide vane assembly on an axial flow compressor?
Directs the air into the 1st stage rotor blades at the proper angle.
- The stator vanes in an axial flow compressor?
Convert velocity energy into pressure energy.
- The purpose of a bleed valve, located in the beginning stages of the compressor, in an aircraft gas turbine engine is to?
Vent some of the air overboard to prevent a compressor stall.
- What is meant by a double entry centrifugal compressor?
A compressor with vanes on both sides of the impeller.
- What is the major function of the turbine assembly in a turbojet engine?
Supplies the power to turn the compressor.
- Stator blades in the compressor section of an axial flow turbine engine?
Decrease the air velocity and prevent swirling.
- What type of turbine blade is most commonly used in aircraft jet engines?
Impulse reaction.
- The non rotating axial flow compressor airfoils in an aircraft gas turbine engine, are called?
Stator vanes.
- In a turbine engine axial flow compressor, each consecutive pair of rotor and stator blades constitutes a pressure stage. In same thing, the number of rows of stages is determined by the amount of air and total pressure rise required.
Both are true.
- The stators in the turbine section of a gas turbine engine?
Increase the velocity of the gas flow.
- The compressor stators in a gas turbine engine act as diffusers to?
Decrease the velocity of the gas flow.
- What type igniter plug is used in the low tension ignition system of an aircraft turbofan engine?
Self ionizing or shunted gap type plug.
- What is meant by a shrouded turbine?
The turbine blades are shaped so that their ends form a band or shroud.
