Discussion
Match each element in List I with its role in List II.
List I
A. Nozzle guide vanes
B. Turbine rotor
C. Thermal barrier coating
D. Blade shroud
List II
1. Accelerates and turns the gas into the plane of rotation
2. Extracts work from the gas
3. Insulates the metal from the hot gas
4. Seals the tip and damps vibration
Select the correct match.
Answer: B
Only the second does work on the shaft, and the last two protect the blade rather than contributing to the thermodynamics. Each is present because something in the environment would otherwise limit what the stage can achieve.
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