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Machine Design

Machine Design
Rankine's theory of failure is applicable for following type of materials

Brittle
Ductile
Elastic
Plastic

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Machine Design
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

None of these
Soderberg relation
Gerber relation
Goodman relation

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Machine Design
A transmission shaft includes

Line shaft
All of these
Counter shaft
Over head shaft

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/2A
2W/A
W/A
3W/A

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

25 mm
5 mm
15 mm
10 mm

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ k₂)/ (k₁ + k₂)

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