This set of Basic Advanced Machining Processes Interview questions and answers focuses on “LBM-Applications – 3”.
1. Which of the following are the other applications of LBM?
a) Dressing of grinding wheels
b) Scribing
c) Micromachining
d) All of the mentioned
View Answer
Explanation: Dressing of grinding wheels, scribing, micromachining, controlled fracturing are some of the other applications of Laser beam machining.
2. How the grooves in grinding wheels are produced using laser?
a) Evaporation
b) Damage of composite
c) Evaporation & Damage of composite
d) None of the mentioned
View Answer
Explanation: Grooves on the grinding wheels are produced due to evaporation and damage of the composite wheel material.
3. Work piece tilting depends on which of the following factors?
a) Incident power
b) Beam speed
c) Groove direction
d) All of the mentioned
View Answer
Explanation: Work piece tilting depends on the incident power, beam speed, groove direction, and optical absorption coefficient of the material.
4. What are the values of thickness used is fine cutting process?
a) 0.01 to 0.05 mm
b) 0.05 to 0.1 mm
c) 0.5 to 15 mm
d) 15 to 50 mm
View Answer
Explanation: The thickness of material used in fine cutting process vary from 0.5 to 16 mm.
5. The advantages of excimer laser are due to __________ laser wavelength and _________ pulse duration.
a) Short, short
b) Short, long
c) Long, short
d) Long, long
View Answer
Explanation: The practical advantages of excimer laser are mainly due to short laser wavelength and pulse duration.
6. Lasers of which type are used for modification of electronic components?
a) High power
b) Small spot size
c) Short pulse length
d) All of the mentioned
View Answer
Explanation: Lasers of high power density, small spot size and short pulse length are useful devices for modification of electronic components.
7. Material removal rates which are about mg/pulse produces which type of holes?
a) Shallow
b) Deep
c) Very deep
d) All of the mentioned
View Answer
Explanation: In LBM, material removal at the rate of milligrams per pulse produces shallow holes in the material.
8. Which of the following materials can be easily separated by laser scribing?
a) Silicon
b) Glass
c) Ceramic
d) All of the mentioned
View Answer
Explanation: Brittle materials such as silicon, glass and ceramics may be effectively shaped or separated by laser scribing.
9. Which type of holes can be drilled using Nd-YAG laser?
a) Small holes
b) Large holes
c) Small & Large holes
d) None of the mentioned
View Answer
Explanation: Nd-YAG laser can be used for drilling small holes as well as large holes by trepanning process.
10. Which type of laser can be used for direct drilling or percussion?
a) Ruby laser
b) Nd-YAG laser
c) Ruby & Nd-YAG laser
d) None of the mentioned
View Answer
Explanation: Both Ruby and Nd-YAG laser can be used for direct (percussion) drilling purpose.
11. Which of the following lasers is used for cutting thick materials in LBM?
a) CO2 + gas assisted
b) CO2 only
c) Nd-YAG
d) Ruby
View Answer
Explanation: CO2 + gas assisted laser is used for cutting thicker materials in Laser beam machining process.
12. Which of the following lasers is used for slitting of thin metallic materials in LBM?
a) CO2 + gas assisted
b) CO2 only
c) Nd-YAG
d) Ruby
View Answer
Explanation: Nd-YAG laser is used for slitting of thin metallic materials in Laser beam machining process.
13. Which of the following lasers is used for slitting of thin plastic materials in LBM?
a) CO2 + gas assisted
b) CO2 only
c) Nd-YAG
d) Ruby
View Answer
Explanation: CO2 laser is used for slitting of thin plastic materials in Laser beam machining process.
14. Which of the following lasers is used for organics and non-metallic materials in LBM?
a) CO2 + gas assisted
b) Pulsed CO2
c) Nd-YAG
d) Ruby
View Answer
Explanation: Pulsed CO2 laser is used for organics and non-metallic materials in Laser beam machining process.
15. Which of the following lasers is used for ceramic materials in LBM?
a) Pulsed CO2
b) Nd-YAG
c) Pulsed CO2 & Nd-YAG
d) None of the mentioned
View Answer
Explanation: Both pulsed CO2 and Nd-YAG lasers can be used for ceramic materials in LBM.
Sanfoundry Global Education & Learning Series – Advanced Machining.
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