Manufacturing And Production Technology
Which of the following statement is wrong about ultrasonic machining?

It removes large amount of material
It produces good surface finish
It is best suited for machining hard and brittle materials.
It cuts materials at very slow speeds

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Manufacturing And Production Technology
Trepanning is an operation of

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

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