Machine Design
The temperature at which the new grains are formed in the metal is known as

Upper critical temperature
Recrystallization temperature
Lower critical temperature
None of these

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being greater than unity
Radial load only
Both radial and axial loads and the ratio of these being less than unity
Axial load only

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Machine Design
In hydrodynamic bearings

Grease is used for lubrication
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant

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