According to arrangements of plates, which of the following is not a type of riveted joints?

According to arrangements of plates, which of the following is not a type of riveted joints? Correct Answer zigzag joint

According to arrangement of plates butt joint and lap joint are the types of riveted joint. Butt joints may be single cover plate or double cover plate butt joint. Zigzag joint is also type of riveted joint when classified according to arrangements of rivets.

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In leaf springs, the maximum bending stress developed in the plates is (where W = Load acting on the spring, $$l$$ = Span of the spring, n = Number of plates, b = Width of plates and t = Thickness of plates)