Manufacturing Engineering Multiple Choice Questions on “Laser Beam Machining”.
Click that Pen button, and then choose Laser Pointer from the pop-up menu: Press the Option key, and then click and drag the left mouse button to point to the contents on the slide that you want to draw attention to. Change the color of your laser pointer. By default, the color of the pointer is red, but green and blue are also available. Workpiece material laser beam machining. introduction. characteristics of laser. physical principle of laser. types of laser laser is classified as: i. Semiconductors lasers. laser action in ruby rod. set-up of laser beam machining it consists of, i. Ruby rod with reflecting mirror.
1. LASER stands fora) Light amplification by stimulated emission of radiation
b) Light amplification by stimulated erosion of reaction
c) Light amplification by stimulated erosion of radiation
d) Light amplification by stimulated emission of reaction
Answer: a
Clarification: LASER stands for light amplification by stimulated emission of radiation. LASER have a high amount of energy, which can be used to generate heat.2. Ruby laser is most efficient when
a) Kept cold
b) Kept hot
c) Kept at normal temperature
d) None of the mentioned
Answer: a
Clarification: Ruby laser is most efficient when it is kept cold. Ruby laser is used to produce a LASER. It generally uses chromium ions to produce LASER.
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a) Decrease in power supply
b) Decrease in laser beam spot diameter
c) Increase in cutting speed
d) None of the mentioned
Answer: b
Clarification: Time of machining in the laser beam machining process is directly proportional to laser beam spot diameter. Larger the diameter, larger will be the HAZ.4. Laser beam machining process can be used for
a) Conductors
b) Insulators
c) Metals
d) All of the mentioned
Answer: d
Clarification: Laser beam machining is more versatile and can be used for the metal as well as non metal. It does not require vacuum environment.5. In laser beam machining process, as compared to other unconventional machining processes, heat affected zone is
a) Larger
b) Smaller
c) Not present
d) None of the mentioned
Answer: b
Clarification: In laser beam machining process heat affected zone have smaller area in comparison with other unconventional machining processes. It does not require vacuum environment.6. Which of the following is an unconventional process of machining?
a) Turning
b) Milling
c) Drilling
d) Laser beam machining process
Answer: d
Clarification: Laser beam machining is an unconventional process of machining. It does not require vacuum environment.7. Which of the following is a conventional process of machining?
a) Electro chemical machining
b) Electron beam machining
c) Drilling
d) Laser beam machining process
Answer: d
Clarification: Drilling is a conventional process of machining. Laser beam machining is an unconventional process of machining.8. For machining of plastic material which of the unconventional process can be used effectively?
a) Electro chemical machining
b) Electron beam machining
c) Laser beam machining process
d) None of the mentioned
Answer: c
Clarification: Laser beam machining is more versatile and can be used for metal as well as non metal. In laser beam machining process heat affected zone have smaller area in comparison with other unconventional machining processes.9. Time of cutting in laser beam machining process increases
a) With decrease in cutting speed
b) With Increase in Cutting speed
c) With increase in power
d) None of the mentioned
Answer: a
Clarification: Time of cutting in the laser beam machining process increases with a decrease in cutting speed.10. In laser beam machining process lens is used to
a) Deflect laser beams
b) Diverge laser beams
c) Converge laser beams
d) None of the mentioned
Answer: c
Clarification: Lens is used to converge a laser beam on a very small area.
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------>>[MOST IMPORTANT]<<------Advanced Machining Processes Multiple Choice Questions on “Laser Beam Machining-Introduction”.
1. What is the full form of LBM in advanced machining processes?a) Laser Beam Manufacturing
b) Laser Beam Machining
c) Light Blast Manufacturing
d) Light Beam Machining
Answer: b
Clarification: The full form of LBM is Laser Beam Machining in the advanced machining processes.2. LBM offers a good solution for which material properties below?
a) Thermal conductivity
b) Specific heat
c) Boiling temperature
d) All of the mentioned
Answer: d
Clarification: LBM offers good solution for material properties such as thermal conductivity, specific heat, melting and boiling temperatures.3. What is the abbreviation of Laser?
a) Light allowed simple emission of radiation
b) Light amplification by stimulated emission of radiation
c) Light amplified simultaneous emission of rays
d) Light amplified stimulated emanation of rays
Answer: b
Clarification: Full form of laser is Light Amplification by Stimulated emission of radiation.4. Which of the following are the properties of a laser?
a) Highly collimated
b) Monochromatic
c) Coherent light beam
d) All of the mentioned
Answer: d
Clarification: Highly collimated, high monochromaticity and the coherence of the light beam are the properties of a laser.5. Laser beam machining uses which type of power sources for machining?
a) Very low power
b) Low power
c) Medium power
d) High power
Answer: d
Clarification: High power densities are used for the generation of laser and for machining in Laser beam machining.6. Which of the following are different types of lasers used in Laser beam machining?
a) Solid-state ion
b) Neutral gas
c) Semiconductor
d) All of the mentioned
Answer: d
Clarification: Laser such as solid-state ion, neutral gas, molecular, semiconductor etc.., can be used in LBM.7. Which types of lasers are used in Laser beam machining?
a) Continuous wave
b) Pulsed mode
c) Continuous wave & Pulsed mode
d) None of the mentioned
Answer: c
Clarification: Laser may be in continuous wave (CW) or in Pulsed mode (PM) for machining in LBM.8. What is the wavelength value of Ruby laser used in Laser beam machining?
a) 633 nm
b) 694 nm
c) 856 nm
d) 1064 nm
Answer: b
Clarification: The value of wave length of Ruby laser used in Laser Beam machining is 694 nm.9. 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
Answer: d
Clarification: The value of wave length of Nd-YAG and Nd-glass lasers used in LBM is 1064 nm.10. What is the wavelength value of neutral gas laser used in LBM?
a) 633 nm
b) 694 nm
c) 856 nm
d) 1064 nm
Answer: a
Clarification: The value of wave length of Neutral gas laser used in Laser beam machining is 633 nm.
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11. What is the wavelength value of CO2 laser used in Laser beam machining?a) 0.16 μm
b) 1.6 μm
c) 10.6 μm
d) 106 μm
Answer: c
Clarification: The value of wave length of CO2 laser used in Laser Beam machining is 10.6 μm.12. What are the values of wavelengths of GaAs laser used in LBM?
a) 100 – 200 nm
b) 200 – 400 nm
c) 600 – 700 nm
d) 800 – 900 nm
Answer: d
Clarification: The wavelengths of GaAs laser used in LBM range from 800 – 900 nm.13. What are the values of wavelengths of Excimer laser used in LBM?
a) 100 – 200 nm
b) 200 – 500 nm
c) 600 – 700 nm
d) 800 – 900 nm
Answer: b
Clarification: The wavelengths of Excimer laser used in LBM range from 200 – 500 nm.
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14. What are the values of wavelengths of Argon laser used in LBM?a) 120 – 230 nm
b) 220 – 310 nm
c) 330 – 530 nm
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d) 760 – 940 nmAnswer: c
Clarification: The wavelengths of Argon laser used in LBM range from 330 – 530 nm.