Manufacturing And Production Technology
A taper tap has

Its end tapered for about three or four threads
Its end tapered for about eight or ten threads
Full threads for the whole of its length
None of these

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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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