Arail maintenance team is studying the downtime of the 9e locomotive. data analysis in thousands of rands for a 4 month period is: back pressure regulator, 30; adjust feed worn, 15; jam copper head, 6; lost cooling, 52; valve replacement, 8; and other 5. a) construct a pareto diagram for one month. b) identify the vital few and important many for that particular month.

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa. s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)