Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Face width
Backlash
Working depth
Clearance

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

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