When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as?

When the metal is removed by erosion caused by rapidly recurring spark

1.	When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as?
A.	Electrochemical machining
B.	Electro-discharge machining
C.	Ultrasonic machining
D.	None of these
Answer» C. Ultrasonic machining

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When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as?

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