Unconventional Machine Process Set 3

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 3

Q1 | What is the frequency of mixing chamber, consisting of gas and abrasives?
  • 10 hz
  • 30 hz
  • 50 hz
  • 70 hz
Answer: 50 hz
Explaination:
mixing chamber consisting of carrier gas and the abrasive grains, vibrates at a frequency of 50 hz.
Q2 | What are the processes where Abrasive jet machining can be used?
  • cleaning
  • cutting
  • deburring
  • all of the mentioned
Answer: all of the mentioned
Explaination:
abrasive jet machining can be used for deburring, cutting, cleaning and for many other heavy duty applications.
Q3 | In machining system of AJM, which of the following controls the relative motion between work piece and nozzle?
  • cam drives
  • pantographs
  • trace mechanisms
  • all of the mentioned
Answer: all of the mentioned
Explaination:
relative motion in abrasive jet machining can be controlled by the above mentioned means.
Q4 | Masks, which are used to confine the jet stream location on work piece are made of, which type of materials?
  • copper
  • glass
  • rubber
  • all of the mentioned
Answer: all of the mentioned
Explaination:
masks can be made of any of the above-mentioned materials.
Q5 | In AJM, what is the mechanism of removal of material from the work piece?
  • corrosion
  • abrasion
  • electron transfer
  • vaporization
Answer: abrasion
Explaination:
in abrasive jet machining, the removal of material takes places by mechanical abrasion, using abrasive grains.
Q6 | In AJM, abrasive jet from the nozzle follows, which type of path for a short distance?
  • parallel
  • inclined
  • perpendicular
  • none of the mentioned
Answer: parallel
Explaination:
abrasive particles follow a parallel path for short distance and then flare outward.
Q7 | Which of the following components, influence the material removal rate in Abrasive jet machining?
  • nozzle
  • carrier gas
  • abrasive grains
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the components mentioned above, influence the rate of material removal, directly or indirectly.
Q8 | In the following properties of nozzle, which of them does not influence the MRR?
  • size
  • wear
  • outside temperature
  • distance from work piece
Answer: outside temperature
Explaination:
the outside temperature of nozzle has no influence on the material removal rate.
Q9 | In the following properties of abrasive grains, which of them changes rate of material removal?
  • size
  • strength
  • shape
  • all of the mentioned
Answer: all of the mentioned
Explaination:
the above mentioned properties of abrasive grains influence the material removal rate.
Q10 | As the abrasive flow rate increases, what happens to the volumetric removal rate?
  • increases
  • decreases
  • increase and then decrease
  • decrease and then increase
Answer: increase and then decrease
Explaination:
in ajm, volumetric removal rate increases up to a level and then decreases.
Q11 | What is the value of abrasive grain flow rate in Abrasive jet machining?
  • 0.1 – 2 g/min
  • 3 – 20 g/min
  • 30 – 56 g/min
  • 68 – 85 g/min
Answer: 3 – 20 g/min
Explaination:
abrasive grain flow rate is between 3 – 20 g/min, in ajm.
Q12 | What is the value of carrier gas flow rate in Abrasive jet machining?
  • 6 l/min
  • 17 l/min
  • 28 l/min
  • 39 l/min
Answer: 28 l/min
Explaination:
in abrasive jet machining, the flow rate of abrasive carrier gas is around 28 l/min.
Q13 | Which of the following material/s cannot be used for making of nozzle in Abrasive jet machining?
  • tungsten carbide
  • steel alloy
  • sapphire
  • synthetic sapphire
Answer: steel alloy
Explaination:
nozzle in abrasive jet machining is made up of sapphire or wc.
Q14 | What is the life of Tungsten carbide material nozzle?
  • 1 – 8 hrs
  • 2 – 5 hrs
  • 10 – 15 hrs
  • 25 – 40 hrs
Answer: 10 – 15 hrs
Explaination:
nozzle made up of wc material has a life period which range between 10 – 15 hrs.
Q15 | In AJM, what is the life of synthetic sapphire material nozzle?
  • 100 hrs
  • 300 hrs
  • 500 hrs
  • 700 hrs
Answer: 300 hrs
Explaination:
nozzle made up of synthetic sapphire material has a life period which is about 300 hrs.
Q16 | 05 mm.
  • 0.01 – 0.10 µm
  • 0.15 – 1.5 µm
  • 2.0 – 5.0 µm
  • 7.0 – 10.0 µm
Answer: 0.15 – 1.5 µm
Explaination:
surface roughness value in ajm varies between 0.15 – 1.5 µm, depending on grain size.
Q17 | Which of the following, are the processes and applications in which Abrasive jet machining can be applied?
  • drilling
  • cutting
  • deburring
  • all of the mentioned
Answer: all of the mentioned
Explaination:
abrasive jet machining can be used for cutting, drilling, deburring and cleaning processes.
Q18 | Using abrasive jet machining, wire cleaning and insulation stripping take place without affecting the conductor.
  • true
  • false
Answer: true
Explaination:
without affecting the conductor, both stripping and cleaning are done, by using abrasive jet machining.
Q19 | In Abrasive jet machining, intricate shapes and holes are machined on which type of materials?
  • brittle
  • thin
  • difficult to machine
  • all of the mentioned
Answer: all of the mentioned
Explaination:
abrasive jet machining is used to machine, intricate shapes and holes in brittle, thin and difficult to machine materials.
Q20 | State whether the following statement is true or false, about Abrasive jet machining. “Using Abrasive jet machining, micro deburring of hypodermic needles can take place.”
  • true
  • false
Answer: true
Explaination:
abrasive jet machining can be used for micro deburring of hypodermic needles.
Q21 | What are the type of materials that can be machined using Abrasive jet machining?
  • glass
  • sapphire
  • quartz
  • all of the mentioned
Answer: all of the mentioned
Explaination:
in abrasive jet machining, the above mentioned materials can be machined, which are heat sensitive and brittle.
Q22 | What is the amount of material utilizes when we machine parts using Abrasive jet machining?
  • very low
  • low
  • medium
  • high
Answer: high
Explaination:
in abrasive jet machining, material utilization is very high since it removes material by using abrasives.
Q23 | After how much time tool has to be changed in AJM?
  • 1 hr
  • 2 hrs
  • 5 hrs
  • no tool change required
Answer: no tool change required
Explaination:
in abrasive jet machining, tool changes are not required.
Q24 | By using Abrasive jet machining, how much amount of hardening does the materials experience?
  • no hardening
  • very less hardening
  • average hardening
  • high hardening
Answer: no hardening
Explaination:
in abrasive jet machining, hardening is not experienced by the machined materials.
Q25 | Which type of materials cannot be machined using Abrasive jet machining?
  • soft materials
  • hard materials
  • difficult to machine materials
  • none of the mentioned
Answer: soft materials
Explaination:
soft materials such as candy bars, thin softwood etc.., cannot be machined using ajm.
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