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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.35
0.2
0.65
0.5

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Machine Design
Brittle coating technique is used for

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

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Machine Design
When two springs are in series (having stiffness K), the equivalent stiffness will be

K/4
K
2K
K/2

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Machine Design
The belt slip occurs due to

Any one of the above
Heavy load
Driving pulley too small
Loose belt

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Machine Design
Maximum principal stress theory is applicable for

All of these
Elastic materials
Ductile materials
Brittle materials

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.5
2.5
2.8
3.0

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