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Machine Design

Machine Design
The included angle in unified of American National threads is

60°
47°
55°
29°

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Machine Design
The maximum shear stress theory is used for

Ductile materials
Plastic materials
Brittle materials
Nonferrous materials

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Machine Design
The number of slots in a 25 mm castle nut is

8
4
6
2

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Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.65
0.5
0.35
0.2

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Machine Design
Guest's theory is used for

Brittle materials
Plastic materials
Elastic materials
Ductile materials

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Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

p = D sin (180°/T)
p = D sin (90°/T)
p = D sin (120°/T)
p = D sin (360°/T)

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