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Machine Design

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

0.35
0.5
0.2
0.65

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

P1 / P2 = e–ᶠα
P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα

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Machine Design
Crushing resistance required to crush the rivet per pitch length is

p.d.σc
(p - d) t.σc
p.t.σc
n.d.t.σc

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Machine Design
Shear stress theory is applicable for

Elastic materials
Brittle materials
Ductile materials
All of these

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Machine Design
The expression 0.175 - 0.841/T is the Lewis form factor for

14½° composite and full depth involute system
20° stub system
20° full depth involute system
None of these

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to (Where, Pc = tension in belt due to centrifugal force)

1 Pc
2 Pc
3 Pc
Pc/3

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