Machine Design
The centre distance between two meshing involute gears is equal to

Difference of base circle radii/cosφ
Difference of pitch circle radii/cosφ
Sum of base circle radii/cosφ
Sum of pitch circle radii/cosφ

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

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