Machine Design
A coupling used to connect two perfectly aligned shafts, is

All of these
Muff coupling
Compression coupling
Flange coupling

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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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