This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “LBM-Applications – 1”.
1. Which of the following are the applications of Laser Beam Machining?
a) Drilling
b) Cutting
c) Texturing
d) All of the mentioned
View Answer
Explanation: Drilling, cutting and grooving, texturing and structuring, milling and dressing etc.., are the applications of Laser beam machining process.
2. State whether the following statement is true or false regarding the drilling using LBM.
“Compared to LBM, conventional machining is more accurate and efficient.”
a) True
b) False
View Answer
Explanation: Conventional machining is less sufficient than Laser Beam machining because of their material toughness.
3. Other non-conventional processes lay behind Laser beam machining in drilling process because of which factors below?
a) High cost
b) Long lead times
c) Low machining speeds
d) All of the mentioned
View Answer
Explanation: Other non-conventional processes need high costs for tools, long lead times, and low machining speeds when compared to LBM.
4. Laser drilling has proven to be more efficient in which of the following factors?
a) Cost
b) Quality
c) Reliability
d) All of the mentioned
View Answer
Explanation: Laser drilling has proven to be an efficient one in terms of cost, quality, and reliability for large-scale production applications.
5. Which of the following are different laser drilling processes in Laser beam machining?
a) Direct drilling
b) Drill and ream
c) Trepanning
d) All of the mentioned
View Answer
Explanation: Laser drilling can be performed by three methods that are – direct (percussion) drilling, trepanning, drill and ream.
6. The hole size in direct drilling depend up on which of the factors below?
a) Input power
b) Focusing adjustments
c) Input power & Focusing adjustments
d) None of the mentioned
View Answer
Explanation: The hole size in the direct drilling method of Laser drilling process, depend on input power and focusing adjustments.
7. Which method mentioned below is used for drilling of large size holes?
a) Direct drilling
b) Drill and ream
c) Trepanning
d) All of the mentioned
View Answer
Explanation: Trepanning method of laser drilling process is used for drilling large holes either by rotating or moving the part.
8. What are the values of diameters obtained by using Laser drilling process?
a) 0.0001 – 0.001 mm
b) 0.001 – 0.01 mm
c) 0.005 – 1.25 mm
d) 1.5 – 10.5 mm
View Answer
Explanation: Values of diameters obtained by using Laser drilling process range between 0.005 – 1.27 mm.
9. What is the value the maximum optimum depth that can be machined using Laser drilling process?
a) 0.17 mm
b) 1.7 mm
c) 17.1 mm
d) 171.7 mm
View Answer
Explanation: The maximum depth obtained when by using laser drilling is about 1.7 mm.
10. What are the values of entrance angles that vary in Laser drilling process?
a) 0.1 – 1 oC
b) 1 – 5 oC
c) 15 – 90 oC
d) 90 – 150 oC
View Answer
Explanation: Values of the entrance angles in Laser drilling process range between 15 – 90 oC.
11. The taper obtained in Laser drilling process is how much of the hole diameter?
a) 1 – 5%
b) 5 – 20%
c) 20 – 50%
d) 50 – 90%
View Answer
Explanation: Taper value obtained in Laser drilling process range between 5 – 20% of the hole diameter.
12. What is the depth-to-diameter ratio obtained in drilling process using Laser beam machining?
a) 10:1
b) 20:1
c) 50:1
d) 80:1
View Answer
Explanation: Value of the maximum depth-to-diameter ratio obtained in drilling using Laser beam machining is 50:1.
13. What is the maximum value of drilling depth in trepanning method of laser drilling process?
a) 1.7 mm
b) 4.3 mm
c) 6.4 mm
d) 7.9 mm
View Answer
Explanation: The depth increases when we use a trepanning method for laser drilling process and that is about 6.40 mm.
14. What are the tolerance values obtained when we use laser drilling process?
a) 0.1 – 5%
b) 5 – 20%
c) 25 – 50%
d) 50 – 80%
View Answer
Explanation: The tolerance values are will range between 5 – 20% of the diameters obtained in Laser drilling process.
15. What is the value of minimum corner radius obtained by drilling in Laser beam machining?
a) 0.10 mm
b) 0.25 mm
c) 0.50 mm
d) 0.65 mm
View Answer
Explanation: The value of the minimum corner radius obtained while drilling using LBM is about 0.25 mm.
Sanfoundry Global Education & Learning Series – Advanced Machining.
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