Unconventional Machine Process Set 8

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 8

Q1 | Copper has                    Electro discharge machining wear and                    conductivity.
  • good, better
  • good, worse
  • bad, better
  • bad, worse
Answer: good, better
Explaination:
cu is the metal which has better conductivity and good electro discharge machining wear.
Q2 | Which of the following tungsten carbides are used as electrodes in EDM?
  • silver tungsten
  • copper tungsten
  • all of the mentioned
  • none of the mentioned
Answer: all of the mentioned
Explaination:
both silver tungsten and copper tungsten are the tungsten carbides used in edm.
Q3 | Brass metal ensures which type of sparking conditions in Electro discharge machining?
  • stable
  • unstable
  • unsteady
  • insecure
Answer: stable
Explaination:
brass is a type of metal which ensures stable sparking conditions in electro discharge machining.
Q4 | In addition to the feed of tool, Electro discharge machining tool can have which type of motion?
  • oscillatory
  • rotary
  • vibrational
  • all of the mentioned
Answer: rotary
Explaination:
in addition to feed, the tool electrode may have rotary or orbiting motion.
Q5 | Which of the following parameters determines the size of cavities?
  • size of electrode
  • radius of orbit
  • all of the mentioned
  • none of the mentioned
Answer: all of the mentioned
Explaination:
size of electrode and radius of orbit determines the size of cavities in edm.
Q6 | Electrode orbiting                  the flushing of dielectric fluid in Electro discharge machining.
  • improves
  • decreases
  • reduces
  • degrades
Answer: improves
Explaination:
the additional orbiting motion of electrodes helps in improving the flushing by creating a pumping effect of dielectric liquid.
Q7 | Quality of hole produced by orbiting motion is                    to that obtained by using stationary electrode.
  • inferior
  • superior
  • lower
  • all of the mentioned
Answer: superior
Explaination:
quality of hole produced by orbiting motion is superior to that obtained by using stationary electrode.
Q8 | In EDM, electrode polarity depends up on which of the following components?
  • work piece
  • electrode material
  • all of the mentioned
  • none of the mentioned
Answer: all of the mentioned
Explaination:
in electro discharge machining, electrode polarity depends on both work piece and electrode material
Q9 | Which one among the following, is the most important factor in determining the tool wear?
  • melting point
  • boiling point
  • power supplied
  • feed rate
Answer: melting point
Explaination:
in edm, melting point is the most important factor in determining the tool wear.
Q10 | Electrode wear ratios can be expressed as, which of the following wears?
  • end wear
  • side wear
  • corner wear
  • all of the mentioned
Answer: all of the mentioned
Explaination:
electrode wear ratios are expressed as end wear, corner wear, side wear and volume wear.
Q11 | Which of the following are the other factors that influence the electrode wear?
  • voltage
  • current
  • electrode material
  • all of the mentioned
Answer: all of the mentioned
Explaination:
in edm, electrode wear depends on the factors such as voltage, current, electrode material and polarity.
Q12 | 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.”
  • true
  • false
Answer: false
Explaination:
electrode wear is more when it comes to micromachining applications in edm.
Q13 | 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.”
  • true
  • false
Answer: false
Explaination:
in edm, corner wear ratio depend on the material of electrode used.
Q14 | In Electro discharge machining, highest wear ratio is associated with which type of melting point?
  • low
  • medium
  • high
  • very high
Answer: low
Explaination:
in electro discharge machining, lowering of the melting point of electrode material results in high wear ratio.
Q15 | Which of the following is not a function of dielectric in EDM?
  • flush particles
  • cool the section
  • maintain voltage
  • provide insulation
Answer: maintain voltage
Explaination:
flushing particles, providing insulation and cooling the sections that are heated, are the functions of dielectric.
Q16 | Which of the following are the main requirements of dielectric fluids?
  • viscosity
  • high flash point
  • minimum odour
  • all of the mentioned
Answer: all of the mentioned
Explaination:
adequate viscosity, high flash point, oxidation stability, minimum odour, low cost and good electrical discharge are the main requirements of dielectric fluids.
Q17 | Which of the following can be used as dielectric fluids in EDM?
  • kerosene
  • silicon fluids
  • distilled water
  • all of the mentioned
Answer: all of the mentioned
Explaination:
the dielectric fluids used are kerosene, silicon fluid, ethylene glycol, water in emulsions and distilled water.
Q18 | In EDM, inadequate flushing will not result in which of the following consequences?
  • arcing
  • debris removal
  • decrease electrode life
  • increased production time
Answer: debris removal
Explaination:
inadequate flushing in electro discharge machining results in less removal or no removal of debris.
Q19 | Which methods below, are used for introducing the dielectric in machining gap?
  • normal flow
  • reverse flow
  • jet flushing
  • all of the mentioned
Answer: all of the mentioned
Explaination:
four methods namely normal flow, reverse flow, jet flushing and immersion flushing are used for introducing dielectric.
Q20 | Few large holes are                    than many small flushing holes in Electro discharge machining.
  • worse
  • better
  • well
  • none of the mentioned
Answer: worse
Explaination:
many small holes are better than a few large holes in machining thorough the edm process.
Q21 | 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.”
  • true
  • false
Answer: true
Explaination:
flushing through the tool is preferred than side flushing for deep cuts.
Q22 | In Electro discharge machining, which type of dielectric flow mentioned below is desirable?
  • unsteady flow
  • steady flow
  • unstable flow
  • none of the mentioned
Answer: steady flow
Explaination:
in edm, steady dielectric flow on the entire electrode-work piece interfaces is most desirable
Q23 | Metal is removed on which of the components in electro discharge machining?
  • electrode tool
  • work piece
  • electrode tool & work piece
  • none of the mentioned
Answer: electrode tool & work piece
Explaination:
in electro discharge machining, material is removed from both tool and work piece.
Q24 | On which of the following components, does the MRR depend?
  • work piece
  • electrode tool
  • electrode tool & work piece
  • none of the mentioned
Answer: electrode tool & work piece
Explaination:
material removal rate not only depends on work piece material but also the tool material.
Q25 | Which of the following factors influence the material removal rate?
  • pulse condition
  • electrode polarity
  • machining medium
  • all of the mentioned
Answer: all of the mentioned
Explaination:
the factors such as pulse conditions, electrode polarity and machining medium also affect the material removal rate.
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