Manufacturing And Production Technology
A taper tap has

None of these
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

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Manufacturing And Production Technology
The grooving is an operation of

Beveling the extreme end of a workpiece
Embossing a diamond shaped pattern on the surface of a workpiece
Enlarging the end of a hole cylindrically
Reducing the diameter of a workpiece over a very narrow surface

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