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Machine Design

Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Very fine
Same
Finer
Coarser

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

7500-10,000 kg/cm²
4000-4500 kg/cm²
2000-3000 kg/m²
3000-4000 kg/cm²

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Machine Design
Multiple threads are used to secure

High efficiency
High mechanical advantage
Low efficiency
High load lifting capacity

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
Just below the surface
Surface
None of these

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

3 × (π/4) d² × τ × n
2 × (π/4) d² × τ × n
1.875 × (π/4) d² × τ × n
(π/4) d² × τ × n

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Machine Design
Shear stress theory is applicable for

Elastic materials
All of these
Brittle materials
Ductile materials

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