453) The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

454) The parallel fillet welded joints are designed for compressive strength.

455) A column of length l is fixed at both ends. The equivalent length of the column is

456) A spring of stiffness 1000 N/m is streteched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

457) A feather key transmits a turning moment and permits axial movement also.