This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electro Discharge Machining-Introduction”.
1. In advanced machining processes, what is the full form of EDM?
a) Electro discharge Machining
b) Electro discharge Manufacturing
c) Electrical dimensioning Machining
d) Electrode dimensions Manufacturing
View Answer
Explanation: Full form of EDM in advanced machining processes is, Electrodischarge machining.
2. The evolution of wire EDM took place in which part of history?
a) 1940s
b) 1950s
c) 1960s
d) 1970s
View Answer
Explanation: Evolution of wire EDM in 1970s was due to powerful generators, new wire electrodes, improved machining intelligence and better flushing.
3. Machining speeds have gone up to how many times after the invention of EDM?
a) Ten
b) Twenty
c) Thirty
d) Fifty
View Answer
Explanation: Machining speeds have gone up to 20 times after the invention of EDM.
4. By using EDM, how much percentage of machining costs can be reduced?
a) 10 %
b) 20 %
c) 30 %
d) 50 %
View Answer
Explanation: EDM decreased the machined cost at least by 30 %.
5. After invention of EDM, surface finish have improved by how much factor?
a) 10
b) 15
c) 20
d) 25
View Answer
Explanation: Surface finish have been improved by a factor of 15 after the invention of EDM.
6. Cavities with, which of the following factors can be produced using Electro discharge machining?
a) Thin walls
b) Fine features
c) Thin walls & Fine features
d) None of the mentioned
View Answer
Explanation: Cavities with thin walls and fine features can be machined using EDM.
7. Which of the following geometries can be machined using EDM?
a) Simple
b) Complex
c) Difficult to cut
d) All of the mentioned
View Answer
Explanation: Electrodischarge machining can be used for simple as well as complex geometries.
8. State whether the following statement is true or false regarding EDM.
“In EDM, process is affected by hardness of material.”
a) True
b) False
View Answer
Explanation: EDM process is not affected by the hardness of material.
9. How much amount of burr is produced in this process?
a) 10 %
b) 40 %
c) 70 %
d) No burr
View Answer
Explanation: Electro discharge machining is a burr free process.
10. Which of the following mechanisms is used for material removal?
a) Electro discharge erosion
b) Magnetic abrasion
c) Electro chemical dissolution
d) Mechanical erosion
View Answer
Explanation: Material is removed by electro-discharge erosion (EDE) in EDM.
Sanfoundry Global Education & Learning Series – Advanced Machining.
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