Manufacturing And Production Technology
A bottoming tap has

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

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Manufacturing And Production Technology
When the temperature of a solid metal increases,

Both strength and ductility of the metal decreases
Both strength and ductility of the metal increases
Strength of the metal decreases but ductility increases
Strength of the metal increases but ductility decreases

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