Four jobs are to be processed on a machine as per data listed in the table.

Using the Shortest Processing Time $$(SPT)$$ rule, total tardiness is

A bracket shown in fig. is rigidly mounted on wall using four rivets. Each rivet is $$6mm$$ in diameter and has an effective length of $$12mm.$$

Direct shear stress in $$MPa$$ in the most heavily loaded rivet is

Tooth interference in an external involute spur gear pair can be reduced by

A band brake having band-width of $$80mm,$$ drum diameter of $$250mm,$$ coefficient of friction of $$0.25$$ and angle of wrap of $$270$$ degrees is required to exert a friction torque of $$1000N$$-$$m$$. The maximum tension (in $$kN$$) developed in the band is