Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

None of these
Within the core
Surface
Just below the surface

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

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

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Machine Design
A woodruff key is

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

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Machine Design
The face of the tooth is the

Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth
Width of the tooth measured along the pitch circle

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