Advanced Machining Questions and Answers – EDM-Machining System – 2

This set of Advanced Machining Processes Questions & Answers for entrance exams focuses on “EDM-Machining System – 2”.

1. Which one among the following, is the most important factor in determining the tool wear?
a) Melting point
b) Boiling point
c) Power supplied
d) Feed rate
View Answer

Answer: a
Explanation: In EDM, melting point is the most important factor in determining the tool wear.

2. Electrode wear ratios can be expressed as, which of the following wears?
a) End wear
b) Side wear
c) Corner wear
d) All of the mentioned
View Answer

Answer: d
Explanation: Electrode wear ratios are expressed as end wear, corner wear, side wear and volume wear.

3. The term no wear in EDM occurs when electro-to-work piece wear ratio is __________
a) <1%
b) <3%
c) <5%
d) <10%
View Answer

Answer: a
Explanation: In Electro discharge machining, no wear is the term used when the electrode-to-work piece ratio is less than 1%.
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4. Which of the following are the other factors that influence the electrode wear?
a) Voltage
b) Current
c) Electrode material
d) All of the mentioned
View Answer

Answer: d
Explanation: In EDM, electrode wear depends on the factors such as voltage, current, electrode material and polarity.

5. State whether the following statement is true or false regarding wear in EDM.
“In EDM, electrode wear is less dominant when it comes to micromachining applications.”
a) True
b) False
View Answer

Answer: b
Explanation: Electrode wear is more when it comes to micromachining applications in EDM.
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6. State whether the following statement is true or false regarding wear in EDM.
“In EDM, corner wear ratio does not depend on type of electrode material.”
a) True
b) False
View Answer

Answer: b
Explanation: In EDM, corner wear ratio depend on the material of electrode used.

7. In Electro discharge machining, highest wear ratio is associated with which type of melting point?
a) Low
b) Medium
c) High
d) Very high
View Answer

Answer: a
Explanation: In Electro discharge machining, lowering of the melting point of electrode material results in high wear ratio.
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8. Which of the following is not a function of dielectric in EDM?
a) Flush particles
b) Cool the section
c) Maintain voltage
d) Provide insulation
View Answer

Answer: c
Explanation: Flushing particles, providing insulation and cooling the sections that are heated, are the functions of dielectric.

9. Which of the following are the main requirements of dielectric fluids?
a) Viscosity
b) High flash point
c) Minimum odour
d) All of the mentioned
View Answer

Answer: d
Explanation: Adequate viscosity, high flash point, oxidation stability, minimum odour, low cost and good electrical discharge are the main requirements of dielectric fluids.
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10. Which of the following can be used as dielectric fluids in EDM?
a) Kerosene
b) Silicon fluids
c) Distilled water
d) All of the mentioned
View Answer

Answer: d
Explanation: The dielectric fluids used are kerosene, silicon fluid, ethylene glycol, water in emulsions and distilled water.

11. In EDM, inadequate flushing will not result in which of the following consequences?
a) Arcing
b) Debris removal
c) Decrease electrode life
d) Increased production time
View Answer

Answer: b
Explanation: Inadequate flushing in Electro discharge machining results in less removal or no removal of debris.

12. Which methods below, are used for introducing the dielectric in machining gap?
a) Normal flow
b) Reverse flow
c) Jet flushing
d) All of the mentioned
View Answer

Answer: d
Explanation: Four methods namely normal flow, reverse flow, jet flushing and immersion flushing are used for introducing dielectric.

13. Few large holes are _________ than many small flushing holes in Electro discharge machining.
a) Worse
b) Better
c) Well
d) None of the mentioned
View Answer

Answer: a
Explanation: Many small holes are better than a few large holes in machining thorough the EDM process.

14. State whether the following statement is true or false regarding the dielectric in EDM.
“In EDM, flushing through the tool is more preferred than side flushing.”
a) True
b) False
View Answer

Answer: a
Explanation: Flushing through the tool is preferred than side flushing for deep cuts.

15. In Electro discharge machining, which type of dielectric flow mentioned below is desirable?
a) Unsteady flow
b) Steady flow
c) Unstable flow
d) None of the mentioned
View Answer

Answer: b
Explanation: In EDM, steady dielectric flow on the entire electrode-work piece interfaces is most desirable.

Sanfoundry Global Education & Learning Series – Advanced Machining.

To practice all areas of Advanced Machining for entrance exams, 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, 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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