Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = 2√t
d = √t
d = 1.6√t
d = 6√t

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Machine Design
A woodruff key is

A tapered key with head at one end
Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
All of these

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