Q2. A single-phase power system is shown in Figure P2-1. The power source feeds a 100-kVA 14/2.4-kV transformer through a feeder impedance of 38.2 + j140 2. The transformer's equivalent series impedance referred to its low-voltage side is 0.10 + j0.4 N. The load on the transformer is 90 kW at 0.8 PF lagging and 2300 V. 0.100 j0.40n Load 90 kW Joso PF lagging Souce Feeder Trandomer Load (transmiion line) FIGURE P2-1 (a) What is the voltage at the power source of the system? (b) What is the voltage regulation of the transformer? (c) How efficient is the overall power system?

the following electrical circuit questions 1. Check the Reciprocity theorem for the network, with source and output response positions being at input and output terminals. 2.Draw an oriented graph for the network and obtain the corresponding incidence matrix. Then, find all cut sets and loops of the network. 3.For the network, assign arbitrary branch voltages and branch currents subject only to KVL and KCL constraints. Then, verify the conclusion of Tellegen’s theorem.

4. Impoundment hydroelectric power plant: The physical head of an impoundment power plant is 204 m. When the penstock is fully closed, the pressure at the outtake end is 2.0 MPa. When the penstock is fully open, the pressure is reduced to 1.75 MPa. a) What is the water density? b) Compute the effective head.

Consider the mobile communication system shown in Figure 2. Assume the tower is providing mobile communication to a cellphone user. The height of the base station (BS) tower is 100m. Assume the elevation of the cellphone from the ground is 2 m, which is insignificant and can be ignored. Assume the smartphone needs at least -50dBm of received power from the base station in order to be able to communicate. Assume the transmit power at the base station is 40dBm, the transmitter and receiver gains are 5 and 2, respectively. The cell phone operates at 1900MHz carrier frequency. B5 h 100m BS_MS_D Figure 2 a) Calculate how far you can be away from the base station (i.e., BS_MS_D distance) and still be within communication range of the base station, i.e., be able to receive the signal sent from the BS. You may use link budget analysis discussed in class. What should be the transmit power of the BS to allow the range R = 21 and still be able to communicate with the BS? Calculate the Path Loss…