Asingle-phase, 50-kva, 2400/240-v, 60-hz distribution transformer has the following parameters: resistance of the 2400-v winding: r1 = 0.75 ω resistance of the 240-v winding: r2 = 0.0075 ω reactance of the 2400-v winding: x1 = 1.0 ω reactance of the 240-v winding: x2 = 0.01 ω (neglect the exciting admittance) the transformer is supplying a rated load of 50 kva at a rated secondary voltage of 240-v and 0.8 power factor lagging. if the transformer is used as a step-down transformer at the load end of a feeder whose impedance is 0.5 + .0 ω, find the voltage vs and the power factor at the sending end of the feeder.

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

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?

Consider airflow over a flat plate of length l = 1.5 m under conditions for which transition occurs at le = 0.9 m based on the critical reynolds number, re,e = 5 x 10. evaluating the thermophysical properties of air at 400 k, determine the air velocity. (hint: use the tables to find the properties of air)