Machine Design
A feather key is generally

Loose in both shaft and hub
Loose in shaft and tight in hub
Tight in both shaft and hub
Tight in shaft and loose in hub

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

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
Equating tearing resistance of the plate to the crushing resistance of the rivets

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