A60-hz single-phase transformer with capacity of 150 kva has the following parameters: rp = 0.35 ω rs = 0.002 ω rc = 5.2 kω xp = 0.5 ω xs = 0.008 ω xm = 1.1 kω the primary transformer voltage is 2.8 kv and the secondary is 230 v. the transformer is connected to a variable load (0 to 300 kw) with a lagging power factor of 0.83 and a load voltage equal to the rated transformer secondary. determine: (a) the total input impedance of the transformer when the secondary is shorted; and (b) the input current, voltage, power and power factor at full load (150 kw). (c) plot the voltage regulation versus load, and determine the load that produces 5% regulation.

No matter what energy transformation we discuss, we know that no energy transfer is 100% efficient. you are about to enter a bicycle rave. you have trained extensively and eaten well to maximize your energy input throughout the bicycle race. you know that some of your kinetic energy will become wasted energy in the form of heat. what is the source of the heat energy and how can you minimize it to maximize the efficiency of your performance in the race? a) you are the source of the heat energy. you can minimize the heat energy but selecting the appropriate clothes to wear. b) air resistance is the source of he heat energy. you can minimize the air resistance by your position while riding the bicycle. c) friction is the source of the heat energy. you can minimize the friction by lubricating all appropriate parts and keeping the tires well inflated. d) kinetic energy is the source of the heat energy. you can reduce the production of heat energy but minimizing the energy you expend to race on the bicycle.