Unconventional Machine Process Set 16

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 16

Q1 | How are the machining times in Laser beam machining?
  • very slow machining times
  • slow machining times
  • moderate machining times
  • fast machining times
Answer: fast machining times
Explaination:
machining is very much rapid and the setup times are economical in laser beam machining.
Q2 | How is the operating cost of the machines used in Laser beam machining?
  • low
  • moderate
  • high
  • very high
Answer: low
Explaination:
the operating cost of the machines in lbm is low but the equipment cost itself is of high cost.
Q3 | How much amount of tapers are occurred in Laser drilled holes?
  • no taper
  • negligible amount of taper
  • some amount
  • none of the mentioned
Answer: some amount
Explaination:
tapers are generally occurred in the direct drilling of holes using laser beam machining.
Q4 | State whether the following statement regarding Laser beam machining is true or false. “In LBM, a blind hole of precise depth is easy to achieve.”
  • true
  • false
Answer: false
Explaination:
a blind hole of precise is difficult to achieve in laser beam machining.
Q5 | What is the maximum depth up to which holes can be drilled using LBM?
  • 10 mm
  • 30 mm
  • 50 mm
  • 70 mm
Answer: 50 mm
Explaination:
the thickness of the material that can be laser drilled is restricted to 50 mm.
Q6 | What is to be done to the adherent material which are found at exit holes?
  • shape them
  • leave away
  • remove them
  • flatten them view answer
Answer: remove them
Explaination:
adherent material found at the exit of holes has to be removed in lbm
Q7 | What is the full form of PBM in the advanced machining processes?
  • plasma beam manufacturing
  • plasma beam machining
  • plasma blast manufacturing
  • plasma blast machining
Answer: plasma beam machining
Explaination:
the full form of pbm in the advanced machining processes is plasma beam machining.
Q8 | PBM is the only process which works faster in                  steel than                    steel.
  • stainless, mild
  • mild, stainless
  • remains same all
  • all of the mentioned
Answer: stainless, mild
Explaination:
pbm is the only fabrication process which works faster in stainless steels compared to mild steels.
Q9 | What is the value of velocity of plasma jet in Plasma beam machining?
  • 100 m/sec
  • 300 m/sec
  • 400 m/sec
  • 500 m/sec
Answer: 500 m/sec
Explaination:
the value of the velocity of the plasma jet in plasma beam machining is about 500 m/sec.
Q10 | What is the value of material removal rate in Plasma Beam Machining process?
  • 50 cm3/min
  • 100 cm3/min
  • 150 cm3/min
  • 200 cm3/min
Answer: 150 cm3/min
Explaination:
the values of the material removal rates in plasma beam machining will be nearly 150 cm3/min.
Q11 | What is the value of specific energy used in Plasma beam machining process?
  • 100 w/(cm3-min)
  • 200 w/(cm3-min)
  • 300 w/(cm3-min)
  • 400 w/(cm3-min)
Answer: 100 w/(cm3-min)
Explaination:
the value of the specific energy used in plasma beam machining process is about 100 w/(cm3-min).
Q12 | What is the value of the current used in PBM process?
  • up to 200 a
  • up to 400 a
  • up to 600 a
  • up to 800 a
Answer: up to 600 a
Explaination:
the value of the current used in pbm will be up to 600 a.
Q13 | What is the maximum value of the thickness used in PBM process?
  • 100 mm
  • 200 mm
  • 300 mm
  • 400 mm
Answer: 200 mm
Explaination:
the maximum value of the thickness used in the plasma beam machining process is about 200 mm.
Q14 | Which of the following are the different shielded plasmas used in PBM?
  • gas-shielded plasma
  • water-shielded plasma
  • gas-shielded & water-shielded plasma
  • none of the mentioned
Answer: gas-shielded & water-shielded plasma
Explaination:
both gas-shielded plasma and water shielded plasma are used in the plasma beam machining process
Q15 | Material removal rates depend on which of the following factors?
  • work piece material
  • type of cutting
  • shielding gases
  • all of the mentioned
Answer: all of the mentioned
Explaination:
material removal rates in pbm depend on work piece material, type of cutting and the shielding gas.
Q16 | A low power factors indicates                      energy required and                      removal rates.
  • low, low
  • low, high
  • high, low
  • high, high
Answer: low, high
Explaination:
a low power factor in plasma beam machining indicates low energy required and high material removal rates.
Q17 | What happens to the machining speed if the thickness of material is increased in PBM?
  • decreases
  • increases
  • enhanced
  • remains same
Answer: decreases
Explaination:
machining speed in plasma beam machining reduces with an increase in the thickness of the work piece material.
Q18 | What is the machining speed required for machining of 12mm thick plate with 220 kW energy?
  • 1000 mm/min
  • 1500 mm/min
  • 2000 mm/min
  • 2500mm/min
Answer: 2500mm/min
Explaination:
machining speed required for cutting 12-mm thick plate with 220 kw power is about 2500 mm/min.
Q19 | The cut edge of the material tends to be                      than the base metal in PBM.
  • smoother
  • harder
  • same as
  • none of the mentioned
Answer: harder
Explaination:
the cut edge of material in pbm tends to be harder than the base metal.
Q20 | How much thickness of cracks may arise beyond HAZ due to rapid cooling?
  • 1.6 mm
  • 2.6 mm
  • 3.6 mm
  • 4.6 mm
Answer: 1.6 mm
Explaination:
the cracks due to rapid cooling in pbm may extend beyond haz to a thickness of 1.6 mm.
Q21 | What are the values of tolerances obtained by using PBM?
  • ± 0.6 mm
  • ± 1.6 mm
  • ± 2.6 mm
  • ± 3.6 mm
Answer: ± 1.6 mm
Explaination:
the values of the tolerances obtained by using plasma beam machining will be about ± 1.6 mm.
Q22 | What is the maximum thickness of the walls of tube machined using plasma arc?
  • 10 mm
  • 30 mm
  • 50 mm
  • 70 mm
Answer: 50 mm
Explaination:
the maximum thickness of the wall tubes that can be produced using pbm is about 50 mm.
Q23 | Which of the following are the advantages of PBM?
  • no chemical
  • less harmful
  • operates cleanly
  • all of the mentioned
Answer: all of the mentioned
Explaination:
main advantages of plasma bema machining are no complicated chemical analysis, less harmful and no harmful exposure and it operates cleanly.
Q24 | Which of the following chemicals are used in PBM?
  • harmful chlorinated fluorocarbons
  • acid cleaning chemicals
  • dissolvable solvent chemicals
  • none of the mentioned
Answer: none of the mentioned
Explaination:
plasma beam machining uses no harmful chlorinated fluorocarbons, acid cleaning chemicals or any dissolvable solvents.
Q25 | How much amount of energy is required for machining using PBM?
  • low
  • moderate
  • high
  • very high
Answer: low
Explaination:
the cost for operating the jobs in plasma beam machining is less and also less energy is required for operating the machine in pbm.
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