Machine Design
Auto frettage is the method of

Calculating stresses in thick cylinders
Pre-stressing thick cylinders
Increasing the life of thick cylinders
Joining thick cylinders

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

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

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