Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) on “EDM-Applications – 2”.
1. Which of the following electrodes are used for machining spherical surfaces in Electro discharge machining?
a) Tubular electrodes
b) Flat electrodes
c) Cuboidal electrodes
d) All of the mentioned
Answer: a
Clarification: Simple tubular electrodes are used to machine convex and concave spherical surfaces.
2. What are the values of dimensional accuracy obtained while machining spherical surfaces?
a) ± 1 µm
b) ± 3 µm
c) ± 5 µm
d) ± 7 µm
Answer: a
Clarification: Dimensional accuracy of ± 1 µm is obtained while machining spherical surfaces using EDM.
3. What are the surface roughness values obtained while machining spherical surfaces using Electro discharge machining?
a) <0.1 µm
b) <0.3 µm
c) <0.5 µm
d) <0.7 µm
Answer: a
Clarification: The surface roughness values obtained while machining of spherical surfaces are <0.1 µm in Electro discharge machining.
4. Which motion of tool is used for machining spherical surfaces in Electro discharge machining?
a) Oscillatory
b) Vibratory
c) Rotary
d) All of the mentioned
Answer: c
Clarification: The rotary motion tool is used for machining spherical surfaces of conducting ceramic materials in EDM.
5. Which type of electrodes are used for milling application in Electro discharge machining process?
a) Tubular type electrodes
b) Cylindrical type electrodes
c) Flat type electrodes
d) Spherical type electrodes
Answer: b
Clarification: Standard cylindrical electrodes are used for milling application in EDM process.
6. Which type of cavities can be machined using milling process by Electro discharge machining?
a) Complex cavities
b) Simple cavities
c) Simple & Complex cavities
d) None of the mentioned
Answer: c
Clarification: Simple cavities and complex cavities are machined by successive NC sweeps of electrode over the desired path.
7. The simple electrodes are rotated at which speed for milling of work pieces in Electro discharge machining?
a) Very low
b) Low
c) Medium
d) High
Answer: d
Clarification: Simple electrodes are rotated at high speeds for milling in Electro discharge machining same as that of conventional milling.
8. What happens to the dielectric flushing while milling tool is rotated at a high speed in EDM?
a) Improved
b) Worsen
c) Reduced
d) All of the mentioned
Answer: a
Clarification: Milling by electro discharge machining enhances the dielectric flushing due to high speed rotation of tool.
9. State whether the following statement is true or false regarding the applications of EDM.
“In EDM, milling process can machine complex shapes with sharp corners.”
a) True
b) False
Answer: b
Clarification: EDM milling has a main limitation i.e.., it cannot machine complex shapes with sharp tools because of rotating tool.
10. Which of the following are the steps included in the die sinking process of EDM?
a) CAD of electrode
b) Electrode manufacturing
c) Programming for die sinking
d) All of the mentioned
Answer: d
Clarification: Designing of electrode, then manufacturing, and programming of die sinking are the steps to be followed for die sinking process in EDM.
11. Wire EDM is a special form of Electro discharge machining which contains __________ electrode.
a) Continuously moving
b) Periodically moving
c) Discontinuously moving
d) All of the mentioned