Machine Design
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

Yield stress
Repeated stress
Fluctuating stress
Alternating stress

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Machine Design
Coaxing is the procedure of increasing

Metal hardness by surface treatment
Metal resistance to corrosion by coating
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal strength by cycling

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Machine Design
A tap bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other
Has both the ends threaded
Has pointed threads

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