Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Greater than 30d
Less than 20d
Equal to inside diameter of pipe
Between 20d and 30d

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Machine Design
When the speed of belt increases,

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

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