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Machine Design

Machine Design
Which of the following property is essential for spring materials?

Ductility
Resilience
Plasticity
Stiffness

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Machine Design
Yield point in fatigue loading as compared to static loading is

Higher
Lower
Depends on other factors
Same

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Machine Design
In a marine flange coupling, the thickness of flange is taken as

d/3
d/2
3d/4
d/4

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Machine Design
The included angle between the sides of V-belt is

60°
40°
38°
45°

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.d.σt
p.t.σt
(p - d) t.σt

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Increasing the length of bar
Decreasing the modulus of elasticity of the bar
All of these
Decreasing the cross-sectional area of the bar

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