In an ultrasonic machining (USM) process, the material

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In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. With increasing feed force, the MRR exhibits the following behavior:

1. increases linearly
2. decreases linearly
3. does not change
4. first increases and then decreases

Correct Option: D