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Machine Design

Machine Design
If a material fails below its yield point, failure would be due to

Fatigue
Creep
Straining
Sudden loading

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

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

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/3σt
pd/σt
pd/2σt
pd/4σt

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Machine Design
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

Both A and B
Left hand
Right hand
None of these

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Machine Design
The shear modulus of resilience is proportional to

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

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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
(8WD/ πd3) × K
(4WD/ πd3) × K

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