Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = √t
d = 2√t
d = 1.6√t
d = 6√t

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

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

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