Fatigue effect for light and medium duty cranes need not be checked if . b) Nsc < 5×106 3 c) Nsc > 5×106 2 d) Nsc < 5×106 .

Correct Answer: (27/γmft)/γmt
Fatigue effect for light and medium duty cranes need not be checked if normal and shear design stress ranges f ≤ (27/γmft) or if actual number of stress cycles, Nsc < 5×106 3, where f = actual fatigue stress range, γmft = partial safety factor for strength, γmf = partial safety factor for material = 1.10.