This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “USM – Material Removal”.
1. By which of the following means, material is removed in USM?
a) Mechanical abrasion
b) Microchipping
c) Cavitation
d) All of the mentioned
View Answer
Explanation: In Ultrasonic Machining, material is removed by any of the above means.
2. What is the percentage of contribution of cavitation to the total material removed?
a) <5%
b) 5 – 10 %
c) 10 – 20 %
d) 20 – 50 %
View Answer
Explanation: Cavitation contributes to only less than 5 % of total material removed.
3. In the following mechanisms, which one is dominant in material removal?
a) Hammering
b) Cavitation
c) Microchipping
d) None of the mentioned
View Answer
Explanation: Hammering is dominant mechanism in material removal of USM.
4. When machining porous material, which type of mechanism is introduces?
a) Abrasion
b) Erosion
c) Corrosion
d) Vaporization
View Answer
Explanation: Material removal of porous material takes place by erosion.
5. The rate of material removal depends on which of the following features?
a) Frequency
b) Static Pressure
c) Machining area
d) All of the mentioned
View Answer
Explanation: Material removal rate depends on all the above mentioned factors.
6. The machinability of USM depends on brittleness criterion.
a) True
b) False
View Answer
Explanation: Both machinability and MRR depends on brittleness of material.
7. Which of the following are the features of tool affecting MRR in USM?
a) Hardness
b) Wearability
c) Accuracy
d) Mounting
View Answer
Explanation: Different features of tool also affect the material removal in USM.
8. What is the machinability rate of glass by USM?
a) 25%
b) 50%
c) 75%
d) 100%
View Answer
Explanation: In the case of brittle materials, Ultrasonic Machining’s MRR is very high.
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