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Machine Design

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

n.d.t.σc
p.t.σc
p.d.σc
(p - d) t.σc

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Machine Design
The objective of idler pulley in belt drive is to

Increase the power transmission capacity
All the above objectives
Decrease the tendency of belt to slip
Increase the wrap angle and belt tension

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kt + 1)/ (Kf + 1)
(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt - 1)/ (Kf - 1)

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Machine Design
When the belt is transmitting maximum power, the belt speed should be(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(Pmax / 3m)
√(3m /Pmax)
√(Pmax / m)
√(Pmax / 2m)

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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
0.2
0.5
0.35

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Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Dynamic loading
Static loading
Combined static and dynamic loading
Completely reversed loading

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