Machine Design
The ball bearings are provided with a cage

To reduce friction
To maintain the balls at a fixed distance apart
To facilitate slipping of balls
To prevent the lubricant from flowing out

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

When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test
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

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Machine Design
The elasticity is the property of a material which enables it to

Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Retain deformation produced under load permanently
Resists fracture due to high impact loads

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Machine Design
Turn buckle has

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

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