Unconventional Machine Process Set 24

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 24

Q1 | If there is a change in the selected machining conditions, it will have impact on which of the following?
  • process accuracy
  • surface finish
  • process accuracy & surface finish
  • none of the mentioned
Q2 | Surface roughness depends on current density, which is affected by which of the following?
  • tool feed rate
  • gap voltage
  • work piece material
  • all of the mentioned
Q3 | Machining conditions leading to high accuracy are associated with                  surface roughness and                  productivity.
  • greater, greater
  • smaller, greater
  • greater, smaller
  • smaller, smaller
Q4 | Non stationary behaviour of ECM is due to, which of the factors below?
  • gas generation
  • heating
  • passivation
  • all of the mentioned
Q5 | For large components, actual machining time constitutes to how much percentage of the total machining time?
  • very low
  • low
  • medium
  • high
Q6 | What happens to the product cycle time, if the machining performance is improved?
  • increases
  • decreases
  • remains same
  • none of the mentioned
Q7 | The cost of additional control hardware remain a                    fraction of total machining cost.
  • small
  • large
  • equal
  • none of the mentioned
Q8 | With an increase in unmanned machining hours, what happens to the efficiency of ECM?
  • increases
  • reduces
  • decreases
  • increase and then decrease
Q9 | Which type of damage is caused by deterioration which is caused by spark?
  • reparable
  • irreparable
  • all of the mentioned
  • none of the mentioned
Q10 | Which of the following use ECM for different applications?
  • gas turbines
  • jet engines
  • bio medical implants
  • all of the mentioned
Q11 | Which of the following processes can be done using ECM?
  • die sinking
  • profiling and contouring
  • drilling and trepanning
  • all of the mentioned
Q12 | Which of the following material cannot be machined using ECM?
  • high strength alloys
  • hardened steels
  • nonconductive materials
  • all of the mentioned
Q13 | ECM is used to                    the sharp edges produced after rough cuts.
  • enhance
  • dull
  • improve
  • none of the mentioned
Q14 | ECM is usually characterized as low accuracy machining, for which of the following reason?
  • narrow gap width
  • wider gap width
  • high current densities
  • all of the mentioned
Q15 | In micro ECM, which of the following is used as micro tool?
  • electrolyte jet
  • electrodes
  • power supply
  • all of the mentioned
Q16 | Micro ECM is used to machine which type of parts?
  • large parts
  • micro parts
  • normal sized parts
  • all of the mentioned
Q17 | Which of the following produces small indents and cavities using micro ECM?
  • moving the work piece
  • switching the pulse current
  • moving the work piece & switching the pulse current
  • none of the mentioned
Q18 | What fraction of tool will always be in contact with the work piece?
  • half
  • full
  • no contact
  • quarter
Q19 | How much amount of wear is present in the tool used in Electrochemical machining?
  • no wear
  • low
  • medium
  • high
Q20 | Compared to other processes, machining is done at                      voltages for high rates of material removal.
  • low
  • medium
  • high
  • very low
Q21 | Very small dimensions, up to which value can be controlled using ECM?
  • 0.01 mm
  • 0.05 mm
  • 0.07 mm
  • 0.12 mm
Q22 | Complicated profiles can be machined in how many operations in Electrochemical machining?
  • single
  • double
  • triple
  • multiple
Q23 | How much amount of thermal damage occurs to the work piece?
  • small
  • large
  • no thermal damage
  • negligible amount
Q24 | Which of the following materials can be machined using ECM?
  • hard nonconductive materials
  • hard conductive materials
  • all nonconductive materials
  • none of the mentioned
Q25 | What are the requirements of labour for machining purpose in Electrochemical machining?
  • low
  • medium
  • high
  • very high