The purpose of the metal spray rub coating...

The purpose of the metal spray rub coating...

Question 1 of 270705eccef9fbacbc34ba4d46b80

The purpose of the metal spray rub coating on the rotor and stator casing of an axial-type compressor is which of the following?

Question 1 of 27070

Q

The purpose of the metal spray rub coating on the rotor and stator casing of an axial-type compressor is which of the following?

🔍 Key Concepts

• Axial-type compressor construction: relationship between rotor, stator, blades/vanes, and casing • Tip and shroud clearances: why small clearances between rotating and stationary parts matter • Function of metal spray rub coating: what happens when rotating tips touch the casing

💭 Think About

• Think about which parts of the compressor could physically come into light contact with the casing during operation and startup, and why a special coating would be helpful there. • Ask yourself: is this coating more likely meant to protect a gearbox, seal a joint, or improve aerodynamic efficiency by managing clearances between moving and stationary blades? • Consider how airflow efficiency and compressor pressure ratio are affected when the gap between blade tips and the casing is too large or too small.

✅ Before You Answer

• Which choice directly involves rotating blade tips or vanes near the stationary casing? • Which option clearly relates to minimizing leakage around blade tips rather than sealing joints or protecting other components? • Eliminate any answers that focus on parts not located at the rotor–stator/casing interface, such as gearboxes or dovetail roots.