Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Bolted joint
Cotter joint
Knuckle joint
Universal joint

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Machine Design
Turn buckle has

Left hand threads on both ends
Right hand threads on bout ends
No threads
Left hand threads on one end and right hand threads on other end

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Machine Design
According to Rankine's theory, the failure occurs at a point in a member

When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test
When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test
When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

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