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

Universal joint
Knuckle joint
Cotter joint
Bolted joint

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Machine Design
In case of V belt drive

The belt should not touch the bottom of groove in the pulley
The belt should touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
None of these

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