Advanced Machining Questions and Answers – EDM-Material Removal Rate

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

1. Metal is removed on which of the components in electro discharge machining?
a) Electrode tool
b) Work piece
c) Electrode tool & Work piece
d) None of the mentioned
View Answer

Answer: c
Explanation: In Electro discharge machining, material is removed from both tool and work piece.

2. On which of the following components, does the MRR depend?
a) Work piece
b) Electrode tool
c) Electrode tool & Work piece
d) None of the mentioned
View Answer

Answer: c
Explanation: Material removal rate not only depends on work piece material but also the tool material.

3. Which of the following factors influence the material removal rate?
a) Pulse condition
b) Electrode polarity
c) Machining medium
d) All of the mentioned
View Answer

Answer: d
Explanation: The factors such as pulse conditions, electrode polarity and machining medium also affect the material removal rate.
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4. In Electro discharge machining, materials with low melting point have which type of material removal rate?
a) Very low
b) Low
c) Medium
d) High
View Answer

Answer: d
Explanation: In Electro discharge machining, materials having low melting point have high material removal rates and vice-versa.

5. In Electro discharge machining, materials with low melting point have which type of surface roughness?
a) Rough
b) Smooth
c) Fine
d) All of the mentioned
View Answer

Answer: a
Explanation: In Electro discharge machining, materials having low melting point have high rougher surfaces and vice-versa.
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6. What are the values of material removal rates in EDM?
a) 0.001 to 0.1 mm3/min
b) 0.1 to 400 mm3/min
c) 400 to 1000 mm3/min
d) 1000 to 5000 mm3/min
View Answer

Answer: b
Explanation: In EDM, material removal rates range from 0.10 to 400 mm3/min.

7. What happens to the material removal rate if the sparks are very less in EDM?
a) Decreases
b) Increases
c) Increase and then decrease
d) All of the mentioned
View Answer

Answer: a
Explanation: In EDM, if sparks generated are less then material removal rate decreases.
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8. What is the relation between the melting point and the material removal rate?
a) Directly Proportional
b) Inversely proportional
c) Indirectly proportional
d) None of the mentioned
View Answer

Answer: b
Explanation: In Electro discharge machining, material removal rate is inversely proportional to the melting point.

9. What happens to the crater size if we increase the current keeping the pulse time constant?
a) Increase
b) Decrease
c) Decrease and increase
d) None of the mentioned
View Answer

Answer: a
Explanation: By keeping pulse time constant and increasing current, crater size also increases.
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10. What happens to the crater size if we decrease the pulse time keeping the current constant?
a) Increase
b) Decrease
c) Increase and decrease
d) None of the mentioned
View Answer

Answer: b
Explanation: By decreasing pulse time and keeping current constant, crater size also decreases.

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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