Machine Design
In order to withstand resistance to wear, the best profile of gear is

20° full depth involute tooth
20° involute stub tooth
14½° full depth involute tooth
14½° stub tooth

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Machine Design
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

There are five rivets per pitch length, out of which four are in double shear and one is in single shear
There are four rivets per pitch length, out of which two are in single shear and two are in double shear
There are five rivets per pitch length, all in double shear
There are four rivets per pitch length, all in double shear

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