Question

Endurance limit is of primary concern in the design of a/an                              

         (1) Rotating shaft

         (2) Industrial structure

         (3) Column

         (4) Machine base

         Which of the above is/are correct?

         (a) 1 only                    (b) 2 only

         (c) 3 and 4 only          (d) 1,2,3 and 4