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

Knuckle joint
Universal joint
Cotter joint
Bolted joint

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards left of the bearing making metal to metal contact
Have contact at the bottom most of the bearing
Move towards right of the bearing making metal to metal contact
Move towards right of the bearing making no metal to metal contact

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