Machine Design
A screw is said to be over hauling screw, if the

Friction angle is more than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%
Friction angle is less than helix angle

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Seriousness would depend on other factors
Equally serious in both types of materials
Very serious in ductile materials and less serious in brittle materials
Very serious in brittle materials and less serious in ductile materials

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