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What are the values of entrance angles that vary in Laser drilling process?

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in Advanced Machining by (962k points)
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

This question was addressed to me in class test.

Enquiry is from LBM-Applications topic in chapter Thermal Processes of Advanced Machining

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Best answer
Right choice is (c) 15 – 90 ^oC

Easy explanation: Values of the entrance angles in Laser drilling process range between 15 – 90 ^oC.

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