AIM Block 13 Practice Test

A purpose of the shrouds on the turbine blades of an axial-flow engine is to

Reduce vibration Increase vibration Reduce noise Improve cooling

Correct Answer:

Reduce vibration

Explanation:

Shrouds around turbine blade tips act like a continuous ring that ties the blades together at their tips. This configuration increases the stiffness of the blade tips and provides damping, so the blades resist bending and flutter under high-speed rotation and aerodynamic loading. With less tip motion, the vibrational stresses are reduced, which protects the blade and disk from fatigue. That’s why reducing vibration is the primary purpose. It isn’t about increasing vibration or primarily about cooling, and while there may be indirect acoustic effects, the main goal is vibration suppression.

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