Machine Design
The face of the tooth is the

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

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets
None of these
Equating shearing resistance to the crushing resistance of the rivets

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