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

Erosion caused by rapidly recurring spark discharges between the tool and work
Direct contact of tool with the 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

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Manufacturing And Production Technology
Which of the following statement is correct about hot machining?

The rate of tool wear is lower.
All of these
It requires less power than machining metals at room temperature.
It is used for machining high strength and high temperature resistant materials.

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