Size the branch circuit conductors and the overcurrent protection for the following circuits: a. A 60A, 480V., 3-Phase linear load that runs at maximum ampacity for 5 hours.
b. A 120V., branch circuit that supplies a cord and plug connected linear 15A load that operates continuously and operates at maximum ampacity for 20-minute durations and supplies a linear 22.5A load that runs for 6 hours.
c. An 88.6A., 208V., 3-Phase non-linear load that runs at maximum ampacity for 1.5- hour durations.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.