26) 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)

27) In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

28) The value of stress concentration factor depends upon

29) Which of the following material has the maximum ductility?

30) When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the