Machine Design
The face of the tooth is the

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

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Machine Design
When the speed of belt increases,

The power transmitted will increase
The coefficient of friction between the belt and pulley increases
The power transmitted will decrease
The coefficient of friction between the belt and pulley decreases

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

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