Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

None of these
Equal to
Larger than
Smaller than

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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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