M15 Gas Turbine Engine Sub-Module No 6 (Quiz :1)

15.6 Turbine sections

Quiz

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1. Gas generator turbine is to absorb approximately ------ percent of the total pressure energy from the exhaust gases ?
   1.   60 to 70
   2.   40-50
   3.   80-90
2. How many types of turbine are ?
   1.   Two
   2.   Four
   3.   Three
3. Most turbofan engines have ------?
   1.   Single stage turbine
   2.   Single spool
   3.   Two spools
4. Signs of -----on the turbine case may indicate the length of turbine blades is out of tolerance ?
   1.   Deformation
   2.   Creep
   3.   Scoring
5. Visible cracks may range in length from --------?
   1.   One-sixteenth inch downward
   2.   Five to ten inch
   3.   One-sixteenth inch upward
6. It increases with temperature and can result in observable dimensional changes to the blades ?
   1.   Deformation
   2.   Stress rupture cracks
   3.   Creep
7. It is caused by over-temperature and appear as waviness and/ or areas of varying airfoil thickness along the leading edge ?
   1.   Creep
   2.   Stress rupture cracks
   3.   Deformation
8. These usually appear as minute hairline cracks on or across the leading or trailing edge at a right angle to the edge length
   1.   Deformation
   2.   Stress rupture cracks
   3.   Creep
9. Which technique mostly used for Crack detection, when dealing with the turbine disk and blades ?
   1.   Ultrasonic
   2.   Eddy-current
   3.   Visual
10. The turbine shaft is usually fabricated from -------?
    1.   Cast iron
    2.   Alloy steel
    3.   Aluminium alloy