1) The three main types of turbine blades are Report

impulse, vector, and impulse-vector

reaction, converging, and diverging

impulse, reaction, and impulse-reaction

2) What are the two main basic components of the turbine section in a gas turbine engine? Report

Hot and cold

Stator and rotor

Impeller and diffuser

3) Turbine impulse blading forms a Report

constant area duct

divergent duct

convergent duct

4) The turbine section Report

increases air velocity to create thrust

uses heat energy to expand and accelerate the gas flow

drives the compressor section

5) Where do stress rupture cracks usually appear on turbine blades? Report

Across the blade root, parallel to the fir tree

Across the leading or trailing edge at a right angle to the edge

Along the leading edge, parallel to the edge

6) What is meant by a shrouded turbine?. Report

The turbine blades are shaped so that their ends form a band or shroud

The turbine wheel has a shroud or duct which provides cooling air to the turbine blades

The turbine wheel is enclosed by a protective shroud to contain the blades in case of failure

7) Turbine nozzle diaphragms located on the upstream side of each turbine wheel, are used to Report

decrease the velocity of the heated gases flowing past this point

direct the flow of gases parallel to the vertical line of the turbine blades

increase the velocity of the heated gases flowing past this point

8) Reduced blade vibration and improved airflow characteristics in turbines are brought by Report

shrouded turbine rotor blades

impulse type blades

fir tree blade attachment

9) What term is used to describe a permanent and cumulative deformation of turbine blades? Report

Stretch

Creep

Distortion

10) What is the major function of the turbine assembly in a turbojet engine? Report

Directs the gases in the proper direction to the tailpipe

Supplies the power to turn the compressor

Increases the temperature of the exhaust gases

11) Gas pressure through the turbine section will generally Report

increase

decrease

remain the same

12) A condition known as 'hot streaking' in turbine engines is caused by Report

a partially clogged fuel nozzle

excessive fuel flow

a misaligned combustion liner

13) Temperature through the turbine stages generally Report

increases

decreases

remains the same

14) Shrouded blades allow Report

smaller inlets to be used

higher turbine inlet temperatures

thinner more efficient blade sections to be used

15) Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause Report

galling

creep

profile

16) N.G.V's form Report

convergent ducts

parallel ducts

divergent ducts

17) Dirt particles in the air going into the compressor of a turbine engine will form a coating on all but which of the following? Report

Turbine blades

Casings

Inlet guide vanes

18) Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by Report

shrouded turbine rotor blades

fir tree blade attachment

impulse type blades

19) A purpose of the shrouds on the turbine blades of an axial flow engine is to Report

reduce air entrance

increase tip speed

reduce vibration

20) Hot section inspections for many modern turbine engines are required Report

on a time or cycle basis

only when an over temperature or overspeed has occurred

only at engine overhaul

EASA Questions Mod 15: Gas Turbine Engine Set 6: Turbine Section

Set 1: Fundamentals

Set 2: Engine Performance

Set 3: Engine Inlet

Set 4: Eng. compressors

Set 5: Combustion Section

Set 6: Turbine Section

Set 7: Engine Exhaust

Set 8: Bearing and Seals

Set 9: Lubricants and Fuel

Set 10: Lubrication system

Set 11: Fuel Systems

Set 12: Air Systems

Set 13: Ignition Systems

Set 14: Engine Indication

Set 15: Power Augmentation

Set 16:Turboprop engines

Set 17: Turboshaft

Set 18: APU

Set 19:Powerplant Installation

Set 20: Fire Protection

Set 21:Engine Monitoring

Set 22: Engine Storage