Q.1
Material removal rates depend on which of the following factors?
  • a) Work piece material
  • b) Type of cutting
  • c) Shielding gases
  • d) All of the mentioned
Q.2
A low power factors indicates __________ energy required and __________ removal rates.
  • a) Low, low
  • b) Low, high
  • c) High, low
  • d) High, high
Q.3
What happens to the machining speed if the thickness of material is increased in PBM?
  • a) Decreases
  • b) Increases
  • c) Enhanced
  • d) Remains same
Q.4
What is the machining speed required for machining of 12mm thick plate withkW energy?
  • a) 1000 mm/min
  • b) 1500 mm/min
  • c) 2000 mm/min
  • d) 2500mm/min
Q.5
How much distortion is produced while machining using PBM?
  • a) 10%
  • b) 20%
  • c) 30%
  • d) No distortion is produced
Q.6
The cut edge of the material tends to be __________ than the base metal in PBM.
  • a) Smoother
  • b) Harder
  • c) Same as
  • d) None of the mentioned
Q.7
What is the thickness of the HAZ in PBM?
  • a) 0.001 to 0.23 mm
  • b) 0.25 to 1.12 mm
  • c) 1.3 to 2.56 mm
  • d) 2.73 to 5.26 mm
Q.8
How much thickness of cracks may arise beyond HAZ due to rapid cooling?
  • a) 1.6 mm
  • b) 2.6 mm
  • c) 3.6 mm
  • d) 4.6 mm
Q.9
What are the values of tolerances obtained by using PBM?
  • a) ± 0.6 mm
  • b) ± 1.6 mm
  • c) ± 2.6 mm
  • d) ± 3.6 mm
Q.10
What is the maximum thickness of the walls of tube machined using plasma arc?
  • a) 10 mm
  • b) 30 mm
  • c) 50 mm
  • d) 70 mm
Q.11
Which of the following are the advantages of PBM?
  • a) No chemical
  • b) Less harmful
  • c) Operates cleanly
  • d) All of the mentioned
Q.12
Which of the following chemicals are used in PBM?
  • a) Harmful chlorinated fluorocarbons
  • b) Acid cleaning chemicals
  • c) Dissolvable solvent chemicals
  • d) None of the mentioned
Q.13
How much amount of energy is required for machining using PBM?
  • a) Low
  • b) Moderate
  • c) High
  • d) Very high
Q.14
What are the disadvantages of PBM?
  • a) Large power supplies
  • b) Heat produced
  • c) Toxic fumes produced
  • d) All of the mentioned
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