Unconventional Machine Process Set 20

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 20

Q1 | Which of the following, are the other advantages of CHM?
  • design changes
  • less skilled operator
  • minor tooling costs
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all of the advantages mentioned above, are obtained using chm.
Q2 | Good surface quality and absence of burr eliminates which of the following?
  • cutting operations
  • finishing operations
  • drilling operations
  • none of the mentioned
Answer: none of the mentioned
Explaination:
absence of burrs and good surface quality eliminates finishing operations in chm.
Q3 | State whether the following statement is true or false about advantages. “Extensive web areas and decorative finishes are not possible using CHM.”
  • true
  • false
Answer: false
Explaination:
decorative finishes are obtained when we use chm.
Q4 | What are the values of scrap rates obtained in Chemical milling?
  • 1%
  • 3%
  • 5%
  • 7%
Answer: 3%
Explaination:
low scrapes rates around 3% are obtained when we use the chemical milling process
Q5 | Which of the following are the limitations of Chemical milling process?
  • disposal of chemicals
  • limited scribing accuracy
  • surface imperfections
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factors mentioned above, are the limitations of chemical milling process.
Q6 | What is the value of shallow cuts obtained on sheets and plates, when we use CHM?
  • 3.83 mm
  • 6.39 mm
  • 12.27 mm
  • 20.32 mm
Answer: 12.27 mm
Explaination:
very shallow depths of value 12.27 mm, are obtained when we use chm.
Q7 | Hand masking, scribing and stripping can be difficult, due to which of the following factors?
  • time consuming
  • repetitive
  • tedious
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factors mentioned above, are main disadvantages for different processes in chm.
Q8 | Which type of metallurgical surfaces are needed in Chemical milling process?
  • homogenous
  • heterogeneous
  • mixture
  • none of the mentioned
Answer: homogenous
Explaination:
metallurgic homogenous surfaces are needed for chemical milling to take place.
Q9 | Porous castings yield, which type of surfaces in Chemical milling process?
  • uniform surfaces
  • even surfaces
  • uneven surfaces
  • none of the mentioned
Answer: uneven surfaces
Explaination:
as there are porous castings, there would be pores on the surface which lead to uneven surfaces.
Q10 | State whether the following statement regarding the limitations of CHM. “Welded areas etch, at a rate that is same as base metal.”
  • true
  • false
Answer: false
Explaination:
welded areas etch at a different rate, when compared to that of base material.
Q11 | Which of the following, indicate the accuracy of scribing by Chemical milling process?
  • unlimited
  • boundless
  • infinite
  • none of the mentioned
Answer: none of the mentioned
Explaination:
scribing accuracy is limited in chm process due to uneven surface finish.
Q12 | Which of the following are the other limitations of Chemical milling process?
  • hydrogen pickup
  • intergranular attack
  • complex designs becoming expensive
  • all of the mentioned
Answer: all of the mentioned
Explaination:
hydrogen pick up, intergranular attack are some other limitations in chemical milling process.
Q13 | Which of the following is not a limitation of Chemical milling process?
  • steep tapers not practical
  • low scrap rates
  • less scribing accuracy
  • deep narrow cuts
Answer: low scrap rates
Explaination:
low scrap rates are possible in chemical milling, which is an advantage to the process
Q14 | Which of the following metals can be machined using the Chemical milling process?
  • copper
  • zinc
  • steel
  • all of the mentioned
Answer: all of the mentioned
Explaination:
zinc, copper, lead, and nickel are some of the metals that can be chemically machined.
Q15 | Which of the following non-metallic materials can be machined using the Chemical milling process?
  • plastics
  • glass
  • ceramics
  • all of the mentioned
Answer: all of the mentioned
Explaination:
non-metallic materials such as glass, ceramics and plastics can also be machined using chemical milling process.
Q16 | Which of the following is the most popular application for weight reduction of aerospace components?
  • shallow cuts
  • deep cuts
  • very deep cuts
  • none of the mentioned
Answer: shallow cuts
Explaination:
shallow cuts in large thin sheets helps in reducing the weight, especially in aerospace industries.
Q17 | How many designs can be machined from the same sheet in Chemical milling?
  • only one
  • two
  • three
  • multiple
Answer: multiple
Explaination:
in chemical milling, multiple designs can b machined on a large thin sheet depending upon the size of the designs.
Q18 | CHM is used to thin out walls, web and ribs of parts that have been produces by which of the following processes?
  • forging
  • casting
  • sheet metal forming
  • all of the mentioned
Answer: all of the mentioned
Explaination:
chm is used for applications mentioned above of the parts, which are formed by casting, forging and sheet metal forming processes.
Q19 | Removal of sharp burrs come under which application of Chemical milling process?
  • deep cuts
  • multiple part machining
  • improving surface characteristics
  • none of the mentioned
Answer: improving surface characteristics
Explaination:
removal of sharp burrs improve the surface characteristics of parts machined using chemical milling.
Q20 | Which of the following can be eliminated from the surfaces using Chemical milling?
  • alpha case from ti-forgings
  • decarburized layer from low cast alloys
  • recast layer from machined parts
  • all of the mentioned
Answer: all of the mentioned
Explaination:
the defects on surfaces mentioned above, can be eliminated using chemical milling process.
Q21 | CHM is used to remove the thin surfaces from forgings and castings, at which time of process?
  • after penetration inspection
  • prior to penetration inspection
  • at the starting of process
  • at the end of process
Answer: prior to penetration inspection
Explaination:
removal of thin surfaces from forgings and casting takes place, prior to penetration depth inspection.
Q22 | State whether the following statement is true or false regarding the applications of CHM. “Removal of thin surfaces, prior to inspection, is done for detection of hidden defects.”
  • true
  • false
Answer: true
Explaination:
removal of thin surfaces is done to detect the hidden defects in surfaces using chm
Q23 | In advanced machining processes, what is the full form of ECM?
  • electrochemical manufacturing
  • electrochemical milling
  • electrochemical machining
  • electrochemical masking
Answer: electrochemical milling
Explaination:
in advanced machining processes, full form of ecm is electrochemical machining.
Q24 | In the following scientists, who was the one to introduce first patent on ECM?
  • balamuth
  • steve o flawer
  • gusseff
  • mcgeough
Answer: gusseff
Explaination:
gusseff was the one, who introduced the first patent on ecm in 1929.
Q25 | Which of the following material removal mechanisms is implemented by ECM?
  • mechanical abrasion
  • electrochemical dissolution
  • chemical corrosion
  • mechanical erosion
Answer: electrochemical dissolution
Explaination:
in ecm, material is removed by electrochemical dissolution.
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