Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Clearance circle diameter × cosφ
Pitch circle diameter × sinφ
Pitch circle diameter × cosφ
Addendum circle diameter × cosφ

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Machine Design
When the speed of belt increases,

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

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