Manufacturing And Production Technology
In ultrasonic machining, the metal is removed by

Erosion caused by rapidly recurring spark discharges between the tool and work
Using abrasive slurry between the tool and work
Maintaining an electrolyte between the work and tool in a very small gap between the two
Direct contact of tool with the work

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Manufacturing And Production Technology
Which of the following statement is correct regarding grinding of high carbon steel?

Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
The grinding wheel has to be of open structure.
All of these
Aluminium oxide wheels are employed.

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