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Machine Design

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

Brittle
Ductile
Plastic
Elastic

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Machine Design
For steel, the ultimate strength in shear as compared to ultimate strength in tension is

43834
43833
43864
43832

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Machine Design
The included angle for the V-belt is usually

10°-20°
40°-60°
60°-80°
30°-40°

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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
0.5
0.65

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Surface
Just below the surface
None of these
Within the core

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2136 N-m
2000 N-m
2050 N-m
2100 N-m

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