Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

138 d
124 d
168 d
151 d

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

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

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