Unconventional Machine Process Set 18

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 18

Q1 | By using Chemical machining, which of the following can be produced?
  • pockets
  • contours
  • slots
  • all of the mentioned
Answer: all of the mentioned
Explaination:
by the use of chm, pockets, contours, slots and materials having high strength to weight ratio can be machined.
Q2 | Pre cleaning is done on the work piece surface in order to achieve, which of the following factors?
  • to provide good adhesion
  • to provide clean surface
  • to assure the absence of contaminants
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factors mentioned above, are achieved thorough pre-cleaning process.
Q3 | Special coatings applied on work piece materials in order to protect them from chemical reaction are known as                    
  • maskants
  • protective coverings
  • protective varnishing
  • none of the mentioned
Answer: maskants
Explaination:
the protective coatings on work pieces are known as maskants.
Q4 | Type of mask depends on which of the factor/s, given below?
  • size of work piece
  • number of parts
  • desired resolution
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factors mentioned above, are required to select the type of mask.
Q5 | During Chemical milling, depth of etch is controlled by which factor of immersion?
  • time
  • mask method
  • mask area
  • none of the mentioned
Answer: time
Explaination:
as the immersion time increases, depth of the etching increases.
Q6 | What is the range of reagent temperatures used for chemical dissolution in CHM?
  • 12ᵒc to 35ᵒc
  • 37ᵒc to 85ᵒc c) 90ᵒc to 101ᵒc d) 121ᵒc to 142ᵒc
Answer: 37ᵒc to 85ᵒc c) 90ᵒc to 101ᵒc d) 121ᵒc to 142ᵒc
Explaination:
the optimum temperature of reagent used should range between 37ᵒc to 85ᵒc.
Q7 | In Chemical milling, excessive flow of chemical reagent results in which of the following defects?
  • channellings
  • grooves
  • ridges
  • all of the mentioned
Answer: all of the mentioned
Explaination:
in chemical milling, if the reagent flows excessively, then the defects mentioned above may occur.
Q8 | State whether the following statement about Chemical milling is true or false. “At higher temperatures, faster etching rates occur in Chemical milling.”
  • true
  • false
Answer: true
Explaination:
as the temperature increases, reaction rate increases which in turn increases etching rate in chm.
Q9 | Of the following, which ratio defines the etch factor?
  • etching depth to undercut
  • undercut to etching depth
  • undercut to mask area
  • mask area to undercut
Answer: undercut to etching depth
Explaination:
etch factor is defined as the ratio of undercut to etching depth.
Q10 | CHM cannot eliminate which of the following defects?
  • irregularities and dents
  • surface scratches
  • waviness
  • all of the mentioned
Answer: all of the mentioned
Explaination:
chm is not a finishing process as that of maf, there are some sort of defects in chemical milling
Q11 | Which of the following are the tools required for Chemical milling?
  • maskants
  • etchants
  • scribing plates
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the components mentioned above, are required to carry out chemical milling process.
Q12 | State which of the following statement is true or false regarding Chemical milling. “Maskants are generally used in CHM, to protect the work piece from the etching chemical agent.”
  • true
  • false
Answer: true
Explaination:
in chm, maskants are used to protect the work piece from chemical agents.
Q13 | Which of the following are the materials used for making maskants?
  • synthetic materials
  • rubber materials
  • polymeric materials
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the materials mentioned above, can be used for making maskants.
Q14 | What are the properties that a maskant used in Chemical milling should possess?
  • be tough and adhere well
  • scribe easily
  • be inert to chemical reagent
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the properties mentioned above, should be possessed by the maskants.
Q15 | Which of the following can be used to apply the maskants on work piece in Chemical milling?
  • dipping or spraying
  • rolling or electro coating
  • adhesive tapes
  • all of the mentioned
Answer: all of the mentioned
Explaination:
maskants can be applied to work piece, by the above mentioned means.
Q16 | State whether the following statement is true or false regarding maskants. “After etching, maskants should be removed easily and inexpensively.”
  • true
  • false
Answer: true
Explaination:
after etching is done, maskants should be removed easily by inexpensive means.
Q17 | In maskant application, photo-resist masks ensure which of the following advantages?
  • high accuracy
  • ease of repetition
  • ease of modification
  • all of the mentioned
Answer: all of the mentioned
Explaination:
we will have the advantages which are mentioned above, if we use photo resist masking.
Q18 | Which of the following, are the main uses of etchants applied in Chemical milling?
  • good surface finish
  • uniform material removal
  • control intergranular attack
  • all of the mentioned
Answer: all of the mentioned
Explaination:
in chm, etchants are used for the above mentioned factors.
Q19 | State whether the following statement is true or false about etchants. “Etchants are used for controlling H2 absorption in case of Ti alloys.”
  • true
  • false
Answer: true
Explaination:
etchants control the h2 absorption in ti alloys.
Q20 | Scribing plates are used to define, which of the following parameters in Chemical milling?
  • areas to be exposed
  • volumes to be exposed
  • areas not to be exposed
  • volumes not to be exposed
Answer: areas to be exposed
Explaination:
scribing plates defines the areas that are to be exposed for removal of material.
Q21 | Which of the following are can be used as guides for scribing process in Chemical milling?
  • layout lines
  • simple templates
  • fibre glass
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the guides mentioned above, can be used for scribing process.
Q22 | Which of the following are the accessories, included in the tooling of Chemical milling?
  • tanks and hooks
  • brackets and racks
  • fixtures
  • all of the mentioned
Answer: all of the mentioned
Explaination:
the accessories mentioned above are included in the tooling of chemical milling.
Q23 | Which of the following come under process parameters of Chemical milling?
  • reagent type
  • concentration
  • operating temperature
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the parameters mentioned above, are different process parameters required for chemical milling.
Q24 | State whether the following statement is true or false about Chemical milling. “Maskants, applied on work pieces, are not responsible for CHM process.”
  • true
  • false
Answer: false
Explaination:
maskants are also responsible for process to take place in chemical milling.
Q25 | To machine high quality parts using CHM, which of the following need not be necessary?
  • heat treatment of work piece
  • grain size of work piece
  • frequency of vibrations
  • range of work pieces
Answer: frequency of vibrations
Explaination:
to machine high qualities products vibrational frequency is not necessary in chm.
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