Machine Design
The distribution of the forces along the length of key fitted in a shaft

Varies exponentially, being more near the torque-input end
Varies exponentially, being less near the torque-input end
Is uniform throughout
Varies linearly

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

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