LASER ASSISTED MACHINING. OF DIFFICULT-TO-MACHINE MATERIALS. Difficult-to-machine materials. Recent years have seen a substantial growth in the use of advanced materials to obtain improved properties such as high hardness, thermal stability, and wear resistance, which are required to meet the stringent specifications of modern products.

Manufacturing Engineering Multiple Choice Questions on “Laser Beam Machining”.

1. LASER stands for

• Switch off laser mode $32=0. Switch on laser mode $32=1 Once in ‘CNC’ mode you can issue a ‘M3′ or ‘M4′ which turns the laser ON. M5 turns it off. The S parm will set the laser power. For example ‘M3 S200′ will turn on the laser beam at 2mA (if you have set the range ‘$30=2000′ or around that mark usually it is closer to.
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a) 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.

3. Time of machining in the laser beam machining process increases with
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

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Answer: c
Clarification: Lens is used to converge a laser beam on a very small area.

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