Machine Design
When a metal or alloy is cold worked,

Its hardness and strength increases
Both (A) and (B)
None of these
It is worked below recrystallization temperature

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Machine Design
In oilness bearings

Grease required to be applied after some intervals
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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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
In increasing the slip of the belt
To increase pulley life
To keep the belt in centre on a pulley while it is in motion

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