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

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

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Manufacturing And Production Technology
Threading is an operation of

Sizing and finishing a small diameter hole
Smoothing and squaring the surface around a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface

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