Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

0.75/(0.75 + √v)
3/(3 + v)
6/(6 + v)
4.5/(4.5 + v)

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

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

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