Advanced Machining Questions and Answers – EDM-Surface Integrity

This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Surface Integrity”.

1. On which of the following factors do the craters depend?
a) Physical properties
b) Mechanical properties
c) Composition of medium
d) All of the mentioned
View Answer

Answer: d
Explanation: In EDM, craters depend on the physical and mechanical properties of material and composition of medium.

2. The maximum depth of damaged layer is how many times that of average surface roughness?
a) 1.5 time
b) 2 times
c) 2.5 times
d) 3 times
View Answer

Answer: c
Explanation: Depth of damaged layer is two and half times the average surface roughness value.

3. What happens to the surface roughness values if the MRR increases in EDM?
a) Increases
b) Decreases
c) Decrease and increase
d) None of the mentioned
View Answer

Answer: a
Explanation: In EDM, the surface roughness values increases linearly with increase in the material removal rates.
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4. State whether the following statement is true or false regarding the surface roughness in EDM.
“In EDM, graphite electrodes produce smoother surfaces than metal ones.”
a) True
b) False
View Answer

Answer: b
Explanation: In EDM, graphite electrodes produce rougher surfaces than that of the metal ones.

5. In Electro discharge machining, what happens to the surface finish if the pulse energy is decreased?
a) Reduces
b) Decreases
c) Improves
d) None of the mentioned
View Answer

Answer: c
Explanation: In Electro discharge machining, the surface finish improves if the pulse energy is decreased.
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6. Using of a mate electrode in Electro discharge machining _____________ the surface roughness of material.
a) Increases
b) Decreases
c) Enhances
d) None of the mentioned
View Answer

Answer: b
Explanation: By using a mate electrode in Electro discharge machining, the surface roughness values are decreased.

7. What happens to the surface roughness if oxygen gas is introduced in the gap?
a) Increases
b) Decreases
c) Decrease and then increase
d) All of the mentioned
View Answer

Answer: b
Explanation: In EDM, surface roughness increases with the supply of oxygen gas in gaps.
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8. By how much percent surface roughness is reduced if we use proper dielectric flow?
a) 25%
b) 50%
c) 75%
d) 100%
View Answer

Answer: b
Explanation: In Electro discharge machining, if we use a proper dielectric fluid flow, surface roughness is decreased by 50 percent.

9. What are the tolerance values obtained by machining using EDM?
a) ± 10 mm
b) ± 15 mm
c) ± 25 mm
d) ± 40 mm
View Answer

Answer: c
Explanation: The tolerance values of ± 25 mm are obtained when we machine components using EDM.
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10. How much extra tolerances are achieved when we choose proper variables?
a) ± 5 mm
b) ± 10 mm
c) ± 15 mm
d) ± 20 mm
View Answer

Answer: a
Explanation: Extra tolerances of ± 5 mm are obtained with a proper choice of process variables.

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.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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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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