Machine Design
When spring index increases, the value of Wahl's stress factor

Increases exponentially
Increases linearly
Remains same
Decreases linearly

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The product of the endurance limits with and without stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

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Machine Design
Which is correct statement? Stress concentration in static 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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