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

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

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch

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Machine Design
Tapered roller bearings can take

Radial load only
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Both radial and axial loads and the ratio of these being less than unity

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