Machine Design
The ratio of pitch circle diameter in millimeters to the number of teeth, is called

None of these
Module
Circular pitch
Diametral pitch

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Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It is more stretched than the outer side during the manufacturing process
It has a lower curvature than the outer side
It is subjected to a higher stress than the outer side
It is subjected to a higher cyclic loading than the outer side

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