This set of Advanced Machining Processes question bank focuses on “EDM-Machining System – 1”.
1. Which of the following are main components of EDM?
a) Dielectric system
b) Servomechanism
c) Power supply
d) All of the mentioned
View Answer
Explanation: Main components of machining system in EDM are – dielectric system, power supply and servomechanism.
2. What is the function of feed-control system in Electro discharge machining?
a) Constant gap
b) Supply power
c) Dielectric fluid supply
d) Work piece holding
View Answer
Explanation: Feed control system is used to maintain constant gap between electrodes.
3. What is the use of power supply system in Electro discharge machining?
a) Constant gap
b) Supply power
c) Dielectric fluid supply
d) Work piece holding
View Answer
Explanation: Power supply system is used to supply pulses at certain voltages, current, on time and off time.
4. What is the function of dielectric circulation unit in Electro discharge machining?
a) Constant gap
b) Supply power
c) Dielectric fluid supply
d) Work piece holding
View Answer
Explanation: Dielectric circulation unit is used to supply dielectric fluid for flushing.
5. Which of the following materials are used as electrodes in EDM?
a) Graphite
b) Copper
c) Brass
d) All of the mentioned
View Answer
Explanation: All the materials mentioned above, can be used as electrodes in Electro discharge machining.
6. Metals with _________ melting point and _________ electrical conductivity are chosen as tools in EDM.
a) Low, good
b) Low, bad
c) High, good
d) High, bad
View Answer
Explanation: In EDM, metals with high melting point and good electrical conductivity are used as tools.
7. Copper has _________ Electro discharge machining wear and _________ conductivity.
a) Good, better
b) Good, worse
c) Bad, better
d) Bad, worse
View Answer
Explanation: Cu is the metal which has better conductivity and good electro discharge machining wear.
8. Which of the following tungsten carbides are used as electrodes in EDM?
a) Silver tungsten
b) Copper tungsten
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: Both Silver tungsten and copper tungsten are the tungsten carbides used in EDM.
9. State whether the following statement is true or false regarding materials used in Electro discharge machining.
“In metals, copper graphite has less electrical conductivity than graphite.”
a) True
b) False
View Answer
Explanation: Copper graphite has better electrical conductivity than graphite.
10. Brass metal ensures which type of sparking conditions in Electro discharge machining?
a) Stable
b) Unstable
c) Unsteady
d) Insecure
View Answer
Explanation: Brass is a type of metal which ensures stable sparking conditions in Electro discharge machining.
11. In addition to the feed of tool, Electro discharge machining tool can have which type of motion?
a) Oscillatory
b) Rotary
c) Vibrational
d) All of the mentioned
View Answer
Explanation: In addition to feed, the tool electrode may have rotary or orbiting motion.
12. Which of the following parameters determines the size of cavities?
a) Size of electrode
b) Radius of orbit
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: Size of electrode and radius of orbit determines the size of cavities in EDM.
13. Electrode orbiting ________ the flushing of dielectric fluid in Electro discharge machining.
a) Improves
b) Decreases
c) Reduces
d) Degrades
View Answer
Explanation: The additional orbiting motion of electrodes helps in improving the flushing by creating a pumping effect of dielectric liquid.
14. Quality of hole produced by orbiting motion is _________ to that obtained by using stationary electrode.
a) Inferior
b) Superior
c) Lower
d) All of the mentioned
View Answer
Explanation: Quality of hole produced by orbiting motion is superior to that obtained by using stationary electrode.
15. In EDM, electrode polarity depends up on which of the following components?
a) Work piece
b) Electrode material
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: In Electro discharge machining, electrode polarity depends on both work piece and electrode material.
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