Unconventional Machine Process Set 19

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 19

Q1 | The process parameters will have direct impact on which of the following factors?
  • etch factor
  • machining rate
  • production tolerance
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factors mentioned above, will have direct impact due to above process parameters.
Q2 | Which of the following, are the general materials used for maskant application?
  • neoprene
  • poly vinyl chloride
  • polyethylene
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the materials mentioned above, can be used as maskant materials.
Q3 | On which of the following factors, MRR will not be depend on?
  • chemical uniformity
  • metallurgical uniformity
  • frequency uniformity
  • temperature uniformity
Answer: frequency uniformity
Explaination:
chemical milling is independent of frequency distribution.
Q4 | Castings having a larger grain size, will show how much surface roughness value?
  • very low
  • low
  • medium
  • high
Answer: high
Explaination:
in castings, as grain size increases, surface roughness increases.
Q5 | Which of the following materials have the highest machining rate and best surface quality?
  • rolled metal sheets
  • thick metal plates
  • polymeric plates
  • plastic sheets
Answer: rolled metal sheets
Explaination:
rolled metal sheets will have highest machining rate and surface quality in chm.
Q6 | For softer materials, which type of etching rates are obtained?
  • very low
  • low
  • medium
  • high
Answer: low
Explaination:
in chemical milling, softer materials need low etching rates.
Q7 | For harder materials, which of the following etching rates are obtained?
  • very low
  • low
  • medium
  • high
Answer: high
Explaination:
in chemical milling, harder materials need higher etching rates.
Q8 | State whether the following statement is true or false about etching rates. “As the etching rate increases, low surface roughness values occur.”
  • true
  • false
Answer: true
Explaination:
high etching rates result in low surface roughness values
Q9 | Which of the following are necessary for best surface quality in Chemical milling?
  • fine grain size and homogenous metallurgy
  • coarse grain size and heterogeneous metallurgy
  • fine grain size and heterogeneous metallurgy
  • coarse grain size and homogenous metallurgy
Answer: fine grain size and homogenous metallurgy
Explaination:
in chm, for best surface quality, fine grain size and homogenous metallurgical work piece must be required.
Q10 | Which of the following are the factors, on which, surface finish depends?
  • grain size
  • heat treatment
  • induced stresses
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factors mentioned above, are responsible for different qualities of surface finish.
Q11 | State whether the following statement is true or false regarding surface finish in CHM. “The surfaces, which are machined using Chemical milling, will have regular lay pattern.”
  • true
  • false
Answer: false
Explaination:
in chm, surfaces do not have regular lay pattern.
Q12 | Which of the following defects cannot be altered or eliminated using CHM?
  • waviness
  • surface imperfections
  • scratches
  • dents
Answer: surface imperfections
Explaination:
using chm, surface imperfections cannot be eliminated.
Q13 | Which type of etching rate, mentioned below, produces low surface roughness?
  • very low
  • low
  • medium
  • high
Answer: high
Explaination:
in chemical milling, high etching rate produces low surface roughness values and tolerances.
Q14 | The depth of cut tolerances increases when machining                          depths at high machining rates.
  • very smaller
  • smaller
  • medium
  • larger
Answer: larger
Explaination:
in chemical milling, tolerance increases when machining depth increases.
Q15 | What is the value of etching rate, which can be achieved using Chemical milling?
  • 0.001 mm/min
  • 0.025 mm/min
  • 0.050 mm/min
  • 0.075 mm/min
Answer: 0.050 mm/min
Explaination:
while we use chemical milling etch rates of around 0.025 mm/min are achieved.
Q16 | What are the tolerance values achieved in Chemical milling, which depend on work piece material and depth of cut?
  • ± 10%
  • ± 20%
  • ± 30%
  • ± 40%
Answer: ± 10%
Explaination:
tolerances of ± 10% of cut width are achieved using chm.
Q17 | For what value of machining depths, surface roughness sharply increases with depth of cut?
  • <100 µm
  • <200 µm
  • <300 µm
  • <400 µm
Answer: <200 µm
Explaination:
for material depths <200 µm, surface roughness increases with depth of cut.
Q18 | What is the value of surface roughness, which is generally obtained using Chemical milling?
  • 0.01 – 0.08 µm
  • 0.1 – 0.8 µm
  • 1 – 8 µm
  • 10 – 80 µm
Answer: 0.1 – 0.8 µm
Explaination:
surface roughness obtained when general conditions are applied, is between 0.1 – 0.8 µm.
Q19 | Which of the following can be easily removed using Chemical milling process?
  • tio2 layer
  • decarburized layer
  • recast structure
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the layers mentioned above, can be removed using chemical milling.
Q20 | What are the advantages when we use Chemical milling process?
  • weight reduction
  • no burrs
  • no stresses
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the advantages mentioned above, can be obtained using chemical milling process.
Q21 | Weight reduction is possible, on which type of contours?
  • very simple
  • simple
  • complex
  • none of the mentioned
Answer: complex
Explaination:
weight reduction can be possible using chemical milling, on complex contours, compared to conventional machining.
Q22 | Simultaneous material removal using Chemical milling, results in which of the following?
  • improves productivity
  • reduces wrapping
  • minimizing part distortion
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the factor mentioned above occur, when we use chemical milling for material removal.
Q23 | State whether the following statement is true or false regarding the advantages of CHM. “As there are no stresses induced, machining of delicate parts is possible.”
  • true
  • false
Answer: true
Explaination:
in chm, no stresses are induced, which makes machining of delicate parts easier.
Q24 | Which type of taper can be achieved, using Chemical milling, on contours?
  • discontinuous
  • continuous
  • periodic
  • none of the mentioned
Answer: continuous
Explaination:
using chemical milling, a continuous taper, on contours can be achieved.
Q25 | State whether the following statement is true or false regarding the advantages? “Capital cost of equipment, for machining large components, is relatively high.”
  • true
  • false
Answer: false
Explaination:
capital cost of equipment, is relatively low for machining large components.
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