Unconventional Machine Process Set 2

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 2

Q1 | 8 – 25 mm.
  • 0.0001 – 0.025 m/min
  • 0.05 – 0.25 m/min
  • 0.5 – 200 m/min
  • 200 – 500 m/min
Answer: 0.5 – 200 m/min
Explaination:
in water jet machining, value of the feed rate ranges between 0.5 – 200 m/min.
Q2 | In WJM, what are the properties of jet fluid that affect the MRR?
  • velocity
  • flow rate
  • viscosity
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the mentioned properties above, of jet fluid affect the mrr in water jet machining.
Q3 | Which of the following property/ies of nozzle does not affect the material removal rate in Water jet machining?
  • material
  • diameter
  • outside temperature
  • stand-off distance
Answer: outside temperature
Explaination:
in the nozzle, outside temperature has no effect on the rate of material removal.
Q4 | In the following materials, Water jet machining can be used on which type of material?
  • metals
  • plastics
  • ceramics
  • all of the mentioned
Answer: all of the mentioned
Explaination:
wjm can be used on metals, cloth, paper, plastics, food, leather, and ceramics.
Q5 | What are the processes and applications, where Water jet machining can be used?
  • cutting
  • drilling
  • deburring
  • all of the mentioned
Answer: all of the mentioned
Explaination:
water jet machining can be used for drilling, cutting, deburring, surface treatment and many more applications.
Q6 | What is the tolerance limit range of thin materials in WJM?
  • ± 0.1 mm
  • ± 10 mm
  • ± 25 mm
  • ± 50 mm
Answer: ± 25 mm
Explaination:
in water jet machining, the range of tolerance is ± 25 mm.
Q7 | In cutting of rocks using water jet machining, which type of pressure is needed?
  • low pressure
  • medium pressure
  • high pressure
  • none of the mentioned
Answer: high pressure
Explaination:
in wjm, very high pressures and velocities are needed while cutting rocks.
Q8 | In deburring, which combination removes the material from non-metallic materials?
  • high pressure and low flow rate
  • high pressure and high flow rate
  • low pressure and low flow rate
  • low pressure and high flow rate
Answer: high pressure and low flow rate
Explaination:
for non-metallic materials high pressure and lower flow rates are used in deburring.
Q9 | Which of the following materials has some drawbacks of cutting WJM?
  • food
  • rocks
  • fibre-reinforced plastics
  • none of the mentioned
Answer: fibre-reinforced plastics
Explaination:
water gets deflected due to the fibre embedded in the matrix of fibre- reinforced plastics when we use wjm.
Q10 | In WJM, surface treatment includes which type of processes?
  • removing deposits
  • removing chemicals
  • degreasing
  • all of the mentioned
Answer: all of the mentioned
Explaination:
surface treatment is done using wjm to clean the surface from many toxic chemical, deposits, residues etc
Q11 | In how many directions, can the cutting takes place in Water jet machining?
  • uni-directional
  • bi-directional
  • multi-directional
  • none of the mentioned
Answer: multi-directional
Explaination:
water jet machining has multi directional cutting capacity i.e.., in any direction in three dimensional space.
Q12 | In Water jet machining, cuts can be started at which place of workpiece?
  • from left
  • from right
  • from middle
  • from any point
Answer: from any point
Explaination:
in wjm, cuts can be started from any point on the workpiece.
Q13 | Which of the following is not an advantage of Water jet machining?
  • burr produced is minimal
  • no heat is produced
  • relatively low hourly rates
  • environmentally safe
Answer: relatively low hourly rates
Explaination:
costs per hour are relatively high in water jet machining.
Q14 | In Water jet machining, tool need not require sharpening once the machining is done.
  • true
  • false
Answer: true
Explaination:
tool does not wear in water jet machining, so it need not be sharpened.
Q15 | Which of the following secondary processes are eliminated in Water jet machining?
  • grinding of surface
  • surface treatment
  • polishing of surface
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the mentioned secondary processes above, are eliminated in water jet machining.
Q16 | How many parts are cut using Water jet machining, on a single blank?
  • one part
  • two parts
  • three parts
  • multiple parts
Answer: multiple parts
Explaination:
depending up on the kerf width, multiple parts can be machined using a single blank.
Q17 | Which of the following is the disadvantage of water jet machining?
  • narrow kerf width
  • small diameter of nozzle
  • not suitable for mass production
  • burr is minimal
Answer: not suitable for mass production
Explaination:
due to high maintenance, wjm cannot be used for mass production.
Q18 | . In advanced machining processes, what is the full form of AJM?
  • automatic jet manufacturing
  • abrasive jet machining
  • automated jet machining
  • abrasive jet manufacturing
Answer: abrasive jet machining
Explaination:
in advanced machining processes, full form of ajm is abrasive jet machining.
Q19 | In AJM, which of the following materials are used as abrasive grains?
  • al2o3
  • sic
  • glass beads
  • all of the mentioned
Answer: all of the mentioned
Explaination:
in abrasive jet machining, any of the particles mentioned above can be used as abrasive grains.
Q20 | In Abrasive jet machining, work piece material of removed by which of the following means?
  • vaporization
  • electro plating
  • mechanical abrasion
  • corrosion
Answer: mechanical abrasion
Explaination:
abrasive particles hit the surface with high pressure and high velocities, which removes the material.
Q21 | Which type of materials can be machined using Abrasive jet machining?
  • glass
  • ceramics
  • hard materials
  • all of the mentioned
Answer: all of the mentioned
Explaination:
materials like ceramics, glass, hard and super hard materials can be machined using abrasive jet machining.
Q22 | In machining system of AJM, which is the medium of carrying the abrasive grains for machining?
  • liquids
  • gases
  • any fluids
  • none of the mentioned
Answer: gases
Explaination:
in ajm, different types of gases are used as the medium for carrying abrasives.
Q23 | In machining system of AJM, what is/are the gas/es used for carrying the abrasives?
  • co2
  • air
  • nitrogen
  • all of the mentioned
Answer: all of the mentioned
Explaination:
in ajm, gases like co2, air or nitrogen are used to carry the abrasives.
Q24 | What is the pressure of gas that is to be supplied, for carrying the abrasives?
  • 0.1 to 1.0 kg/cm2
  • 2.0 to 8.0 kg /cm2 c) 10.0 to 18.0 kg/cm2 d) 25.0 to 35.5 kg/cm2
Answer: 2.0 to 8.0 kg /cm2 c) 10.0 to 18.0 kg/cm2 d) 25.0 to 35.5 kg/cm2
Explaination:
the pressure of the carrying gas should range between 2 to 8 kg/cm2.
Q25 | Which of the following gas, should never be used as the carrier of abrasives?
  • nitrogen
  • co2
  • oxygen
  • air
Answer: oxygen
Explaination:
oxygen should not be used as carrier because it causes a violent chemical reaction with abrasives or work piece.
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