Which statement is not correct regarding the deformation of a circular shaft in torsion? Which statement is not correct regarding the deformation of a circular shaft in torsion? Circular sections remain circular. Cross sections remain flat. Longitudinal lines remain straight. Radial lines on the sections remain straight.

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)