Machine Design
A woodruff key is

Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end
All of these
Fitted in pairs at right angles

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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
Very serious in brittle materials and less serious in ductile materials
Equally serious in both types of materials

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