Machine Design
A key capable of tilting in a recess milled out in a shaft is known as

Hollow saddle key
Woodruff key
Feather key
Flat saddle key

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

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Machine Design
The flank of the tooth is the

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

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