Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

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

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Machine Design
In case of V belt drive

The belt should touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
The belt should not touch the bottom of groove in the pulley
None of these

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