(i) Calculate the total voltage drop. (ii) Calculate the voltage at point B, VB. (iii) Calculate the the sending voltage, VẠ. (iv) Calculate the sending end power factor.

Describe the various methods used for long-distance power transmission, such as HVDC (High Voltage Direct Current) and UHV (Ultra High Voltage).

Give example scenarios in 'Power Grid Extension' and explain

The reactance data for the power system shown in below figure in per unit ona common base is as the following: X²_x² j0.1 G₁ to j0.25 Ti Select one: O a. No right answer O b.-12.19 pu O c.-14.986 pu O d.-) 3.806 pu 2 j0.3 + AL j0.05 j0.25 Assume that the pre fault voltage at bus 2 = 1 pu. For bolted line (b) to line (c) fault at bus 2, the fault current is = j0.5 3 j0.25 T₂ 4 38 + A j0.25 j0.1 G₂ j0.05

b) A fault occurs at bus 3 of the network shown in Figure Q4. Pre-fault nodal voltages throughout the network are of 1 p.u. and the impedance of the electric arc is neglected. Sequence impedance parameters of the generator, transmission lines, transformer and load are given in Figure Q4. V₁ = 120° p.u. V₂ = 120° p.u. V₂ = 1/0° p.u. V₂= 120° p.u. jXj0.1 p.u. JX2) 0.1 p.u. jX0j0.15 p.u. jXn-j0.2 p.u. 1 JX(2)-j0.2 p.u. 2 jX)=j0.25 p.u. JX20-10.15 p.u. jXa(z)-j0.2 p.u. 4 jX2(0)=j0.2 p.u. jXT(1) j0.1 p.u. jXT(2)=j0.15 p.u. jXT(0)=j0.1 p.u. Figure Q4. Circuit for problem 4b). = jXj0.1 p.u. j0.1 p.u. - JX(2) JXL(0) 10.1 p.u. = (i) Assuming a balanced excitation, draw the positive, negative and zero sequence Thévenin equivalent circuits as seen from bus 3. (ii) Determine the positive sequence fault current for the case when a three- phase-to-ground fault occurs at bus 3 of the network. (iii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus…

25. Write the necessity of power supply and briefly describe different types of SMPS and UPS.

Question A

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…

The single line diagram of a power system is shown in Figure Q2.1 including generator and transformer winding connection and earthing details. The parameters for this system have been calculated on a common 100 MVA base and are given in Table Q2.1. All resistances and shunt susceptances are neglected. This system experiences a single line to ground fault at a point F on line L1. The point F is at a distance d from Bus 4 along the line L1. The total length ?? of the line L1 is 50 km. Note that the location of ?? is not drawn to scale in Figure Q2.1. The fault current at the fault point F is measured to be 6.106 kA. i) Determine the zero, positive, and negative sequence Thevenin equivalent impedances as seen at the fault point F. These should be evaluated in per unit and shown as a function of d.ii) Use the sequence impedances calculated in part (i) to determine the distance d of the fault (in km) from Bus 4.