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 five 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 four rivets per pitch length, all in double shear

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Machine Design
Machine screws are

Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between two parts
Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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