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GATE 2016 ME (ME2) – Question 35

Machining and Machine Tool Operations · Abrasive and non-traditional machining processes · 1 mark · Multiple choice

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

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Show answer and explanation

Correct answer: (D) first increases and then decreases

Explanation

Increasing feed force initially improves abrasive indentation and energy transfer, raising removal rate. Beyond an optimum, excessive force restricts slurry circulation and abrasive motion, reducing effective impact action. Therefore MRR **first increases and then decreases, D**, rather than increasing without limit.