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MACHINE DESIGN

Machine Design
Maximum principal stress theory is applicable for

All of these
Ductile materials
Elastic materials
Brittle materials

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Machine Design
In the levers of __________ type, the mechanical advantage is less than one.

Second
First
None of these
Third

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Machine Design
The surface finish factor for a mirror polished material is

0.85
1
0.65
0.45

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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

εc² + εl
εc + 2εl
εc + εl²
2εc + εl

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

Less than 50%
Equal to 50%
More than 50%
None of these

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