A 300-km power line transmits 300 amps at 333,000 V source voltage. The transmission efficiency (the fraction of source power that reaches the destination) is 0.96. Perform your calculations as though the power line were operating with direct current; the calculation with alternating current requires the use of ac impedance rather than resistance.

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)