Machine Design
Shaft coupling is used in machinery to

Reduce the transmission of shock loads
Introduce protection against over loads
Introduce mechanical flexibility
All of these

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Machine Design
A bolt of M 24 × 2 means that

The effective diameter of bolt is 24 mm and there are 2 threads per cm
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals
Do not require external supply of lubricant
The oil film pressure is generated only by the rotation of the journal

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