GATE Technical: GATE 2016 SET-2 Mechanical Engineering (ME) questions with solutions

Q1. 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

Answer: first increases and then decreases

The material removal rate in ultrasonic machining initially increases with feed force due to enhanced contact and energy transfer, but after a certain point, excessive force can lead to tool wear or reduced vibration efficiency, causing the MRR to decrease.