Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

(1/2) × √(σ² × 4τ²)
(1/2) × [σ + √(σ² × 4τ²)]
σ + √(σ² × 4τ²)
√(σ² × 4τ²)

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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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Machine Design
When the belt speed increases

Power transmitted remains the same
Power transmitted increases
Power transmitted decreases
Power transmitted increases to a maximum value and then decreases

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