Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction

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

Answer: a
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

Answer: d
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

Answer: b
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

Answer: c
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

Answer: b
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

Answer: c
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

Answer: d
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

Answer: b
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

Answer: d
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

Answer: a
Explanation: Material is removed by electro-discharge erosion (EDE) in EDM.

Sanfoundry Global Education & Learning Series – Advanced Machining.

To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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