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

Oldham coupling
Knuckle joint
Cotter joint
Universal joint

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Machine Design
Which is correct statement?

A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Which one is rigid will depend on several other factors
Both will be equally rigid
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

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