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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Machine Design
Spring index is

Ratio of coil diameter to wire diameter
Indication of quality of spring
Its capability of storing energy
Load required to produce unit deflection

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