Machine Design
A hot short metal is

Brittle when hot
Ductile at high temperature
Brittle under all conditions
Brittle when cold

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Machine Design
Turn buckle has

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

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Machine Design
In a hydrodynamic lubricated bearing

There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing

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