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Machine Design

Machine Design
A bench vice has following type of threads

Buttress
Metric
Acme
Square

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Machine Design
Brittle coating technique is used for

Determining brittleness
Experimental stress analysis
Protecting metal against corrosion
Protecting metal against wear and tear

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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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Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Tensile stress
Shear stress
Combined tensile and shear stress
Any one of these

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

εc + εl²
2εc + εl
εc² + εl
εc + 2εl

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum shear stress theory
Maximum principal stress theory
Maximum distortion energy theory
Maximum strain energy theory

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