Top 550+ Solved Unconventional Machine Process (UMP) MCQ Questions Answer
Q. What is the wavelength value of Nd-YAG and Nd-glass lasers used in LBM?
a. 633 nm
b. 694 nm
c. 856 nm
d. 1064 nm
Q. What is the wavelength value of neutral gas laser used in LBM?
a. 633 nm
b. 694 nm
c. 856 nm
d. 1064 nm
Q. What is the material removal mechanism of Laser beam machining process?
a. melt and evaporate
b. electro chemical corrosion
c. mechanical erosion of materials
d. electro chemical dissolution
Q. Physics of laser is very complex due to which of the reasons below?
a. scattering loss
b. reflection loss
c. scattering & reflection loss
d. none of the mentioned
Q. What happens when the heat is diffused into bulk material?
a. phase change occurs
b. melting occurs
c. vaporization may take place
d. all of the mentioned
Q. What happens to the process efficiency if plasma plumes are formed in LBM?
a. increases
b. enhances
c. decreases
d. improves
Q. Machining of LBM takes place when power density is than what is lost by conduction and radiation.
a. greater
b. smaller
c. lower
d. same as
Q. Which of the following phenomenon take place before melting and evaporating in LBM?
a. conduction
b. reflection
c. absorption
d. all of the mentioned
Q. What happens to the material removal rate when reflectivity is higher?
a. will decrease
b. will increase
c. will enhance
d. remains same
Q. Reflectivity of the materials depends on which of the following factors?
a. wave length
b. properties of material
c. surface finish
d. all of the mentioned
Q. How much amount of incident radiation is reflected at lower power densities?
a. 10 percent
b. 20 percent
c. 50 percent
d. 90 percent
Q. How are minimum energies required for plastics when compared to that required for metals?
a. lower than
b. higher than
c. same as
d. none of the mentioned
Q. Which of the following has high machining speeds in Laser Beam Machining?
a. metals
b. non metals
c. metal alloys
d. all of the mentioned
Q. Which of the following are the applications of Laser Beam Machining?
a. drilling
b. cutting
c. texturing
d. all of the mentioned