1.

In which year, discovery of USM took place?(a) 1910(b) 1925(c) 1943(d) 1945I had been asked this question in quiz.This interesting question is from Ultrasonic Machining topic in chapter Mechanical Processes of Advanced Machining

Answer»

The CORRECT choice is (d) 1945

For EXPLANATION: Ultrasonic Machining was discovered in 1945.



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