Machine Design
A bolt of M 24 × 2 means that

The pitch of the thread is 24 mm and depth is 2 mm
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
Cross-sectional area of the threads is 24 mm²

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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 increases
The coefficient of friction between the belt and pulley decreases

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