# GATE2017 ME-2: 20

Which one of the following statements is TRUE for the ultrasonic machining (USM) process?

1. In USM, the tool vibrates at subsonic frequency.
2. USM does not employ magnetostrictive transducer.
3. USM is an excellent process for machining ductile materials.
4. USM often uses a slurry comprising abrasive-particles and water.

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