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

None of these
Electro-discharge machining
Electrochemical machining
Ultrasonic machining

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Manufacturing And Production Technology
Lapping is an operation of

Making a cone-shaped enlargement of the end of a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole
Smoothing and squaring the surface around a hole

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