Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Square threads
Acme threads
Multiple threads
Buttress threads

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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 shearing resistance to the crushing resistance of the rivets
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

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