Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

45 to 60%
63 to 70%
80 to 90%
70 to 83%

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Machine Design
Crowning on pulley helps

To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt
To increase pulley life
In increasing the slip of the belt

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