Machine Design
Residual stress in materials

Acts when external load is applied
Is always harmful
Is independent of external loads
Becomes zero when external load is removed

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Machine Design
Which of the following statement is correct regarding power screws?

The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
Both (A) and (B)
The efficiency of a self locking screw can not be more than 50%

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