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Machine Design

Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.75
0.55
0.65
0.45

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(2WD/ πd3) × K
(WD/ πd3) × K
(4WD/ πd3) × K
(8WD/ πd3) × K

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Machine Design
When a metal or alloy is cold worked,

Its hardness and strength increases
Both (A) and (B)
It is worked below recrystallization temperature
None of these

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Machine Design
The shear modulus of resilience is proportional to

(Shear stress)⁴
Shear stress
(Shear stress)²
(Shear stress)3

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Machine Design
The bending stress in a curved beam is

Zero at the centroidal axis
Zero at the point other than centroidal axis
Maximum at the neutral axis
None of these

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

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

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