a) 1.5mm
b) 2mm
c) 5mm
d) 3mm

Answer: d
Explanation: Preferred nominal length of shank are 28,30,32,…..,225mm. Range of length depends on rivet diameter. Tolerance on length = 1.5mm, for rivet diameter ≤ 16mm and tolerance on length = 3mm, for rivet diameter > 16mm.