Machine Design
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

Four times
Equal to
Twice
Three times

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Machine Design
Coaxing is the procedure of increasing

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

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