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
3
2.5
2.8

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Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley increases
The coefficient of friction between the belt and pulley decreases
The power transmitted will increase
The power transmitted will decrease

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