Cold Section
Turbines 1
Components
Hot Section
Who knows?
100
What is the profile of a turbine engine compressor blade?
A reduced blade tip thickness.
100
Where is the highest gas pressure in a turbojet engine?
In the entrance of the burner section.
100
The turbine section of a jet engine
drives the compressor section
100
What are the two basic elements of the turbine section in a turbine engine?
Stator and rotor.
100
Name this compressor
Double entry centrifugal compressor.
200
The highest gas pressure in an axial-flow turbojet engine occurs at the
outlet of the compressor
(The compressor outlet is the same as the burner inlet).
200
True or False
At the higher engine speeds, thrust decreases rapidly with small increases in RPM
False, increase
The relationship between thrust and RPM is such that the amount of thrust increases rapidly as the engine speed increases. A small change in speed at low RPM will not produce nearly as much increase in thrust as the same amount of change at high RPM.
200
What turbine engine section provides for proper mixing of the fuel and air?
Combustion section.
200
Directing the flow of gases to strike the turbine blades at the desired angle is the function of which component?
Nozzle diaphragm, nozzle guide vane, or stator.
200
Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as
Pt7
Turbine-discharge total pressure is identified in maintenance manuals by the abbreviation P(t7). P(t2) is compressor-inlet total pressure, and T(t7) is turbine discharge total temperature.
300
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.
300
How is the total pressure at station 7 abbreviated
Pt7
300
Some high-volume turboprop and turbojet engines are equipped with two-spool or split compressors. When these engines are operated at high altitudes, the
low-pressure rotor will increase in speed as the compressor load decreases in the lower density air.
300
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.
300
True or false:
The hot section includes the combustor, turbines, and exhaust sections.
True
400
The fan rotational speed of a dual axial compressor forward fan engine is the same as the...
low-pressure compressor.
400
In the dual axial-flow or twin spool compressor system, the second or last stage turbine drives the
N1 compressor
400
The energy exchange cycle used in a turbojet engine is the Brayton cycle which is a _______________-______________ cycle
Constant-pressure
400
The exhaust cone on a turbojet engine forms a divergent duct, which does what to the exiting gases?
Increases the pressure of the exiting gases and decreases their velocity.
400
Name this component and what is it used for?
Labyrinth seal and used for as a main bearing oil seal.
500
What is used to straighten and collect the exhaust gases into a solid exhaust jet?
exhaust cone assembly
500
What has taken place if when starting a turbine engine the engine starts but the exhaust gas temperature exceeds specified limits?
A hot start
500
The impeller and diffuser are the two functional elements of which compressor?
Centrifugal
500
What is the first engine instrument indication of a successful start of a turbine engine?
A rise in the exhaust gas temperature.
500
The use of two axial-flow compressors turning at different speeds allows higher ________ _________ to be obtained without the danger of compressor stall.
Compression ratios.