Machine Design
Factor of safety for fatigue loading is the ratio of

Elastic limit to the working stress
Elastic limit to the yield point
Young's modulus to the ultimate tensile strength
Endurance limit to the working stress

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

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
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)

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