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Machine Design

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

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

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-eighth
Double
One-half
One-fourth

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Machine Design
The design of shafts made of brittle materials is based on

St Venant's theory
Rankine's theory
Guest's theory
Von Mises theory

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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

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

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Machine Design
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Larger
Smaller
Equal
Larger/smaller depending on diameter of spring coil

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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 + 2εl
εc + εl²
εc² + εl
2εc + εl

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