Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

None of these
Larger than
Equal to
Smaller than

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Machine Design
Coaxing is the procedure of increasing

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

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