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

2.5
3.0
3.5
2.8

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Machine Design
The creep in the belt is due to

Material of belt
Effect of temperature on belt
Stresses beyond elastic limit of belt material
Unequal extensions in the belt due to tight and slack side tensions

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