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

Buttress threads
Acme threads
Multiple threads
Square threads

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Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
Abrupt change of section
Variation in properties of material from point to point in a member
All of these

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Machine Design
The plasticity is the property of a material which enables it to

Draw into wires by the application of a tensile force
Resist fracture due to high impact loads
Retain deformation produced under load permanently
Regain its original shape after deformation when the external forces are removed

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

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