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What is the depth-to-diameter ratio obtained in drilling process using Laser beam machining?

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What is the depth-to-diameter ratio obtained in drilling process using Laser beam machining?

(a) 10:1

(b) 20:1

(c) 50:1

(d) 80:1

This question was posed to me in an internship interview.

Question is from LBM-Applications topic in division Thermal Processes of Advanced Machining

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The correct answer is (c) 50:1

For explanation: Value of the maximum depth-to-diameter ratio obtained in drilling using Laser beam machining is 50:1.

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