Why are single-phase distribution transformers made whit the low-voltage winding in two sections? A- to make two voltages available on the secondary side, B- to minimize losses, C- to provide a spare, D- none The neutral conductor on the secondary side of a single-phase 3-wire distribution transforme carries the____. A- total load current of both outside conductors. B- product of currents in both of  the outside conductors, C- difference in the currents between both the outside conductors, D- none The primary purpose of a control transformer is to reduce the line ...... A- current to the value needed to operate control circuits, B- wattage to the value needed to operate control circuits, C-voltage to the value needed to operate control circuits, D- none

solve for follwing if the 3 - phase transformer configuration in figure 6 worksheet in imagen 3 has the givens as listed below : E - line on high side = 480V, turns ration=2:1/coil, resistance per load=10, efficiency=100% E-resitor of the load is _______(a-480V , b-240V, c-120V d-69.28) I/resistor on the load is___________, I-line on the llow side is________, I/phase on the low side is________ , I/coil on the lsow side is_______.(a-2A b-4A c-6.93A d-12A0

need detailed solution and complete steps for the parts 4,5 and 6.

The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it has a voltage rating of 8.0-kV:78-kV. A short-circuit test from the high-voltage side (low-voltage winding shortcircuited) gives readings of 4.53 kV, 321 A, and 77.5 kW. An open-circuit test is conducted fromthe low-voltage side and the corresponding instrument readings are 8.0 kV, 39.6 A, and 86.2 kW. (a) Calculate the equivalent series impedance of the transformer as referred to the high-voltageterminals.(b) Calculate the equivalent series impedance of the transformer as referred to the low-voltageterminals.(c) Making appropriate approximations, draw a T equivalent circuit for the transformer.(d) Determine the efficiency of the transformer if it is supplying rated load (unity power factor)at rated voltage at its low-voltage terminal