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

Ultrasonic machining
Electro-discharge machining
None of these
Electrochemical machining

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Manufacturing And Production Technology
A better machinable metal is one which gives

Higher chip-tool contact area and smaller shear angle
Lower chip-tool contact area and larger shear angle
Lower chip-tool contact area and smaller shear angle
Higher chip-tool contact area and larger shear angle

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