P7.1. Solutions for line voltage and current for an open-circuited line. For a line open- circuited at the far end, as shown in Fig. 7.41, obtain the solutions for the phasor line voltage and current, and sketch the voltage and current standing-wave pat- terns, as in Fig. 7.4. FIGURE 7.41 For Problem P7.1. Zo, B Open Circuit + d d = 0

7.19 If the circuits shown in Figure P7.19 are to be at unity power factor, find Cp and Cs. Cs Rz RL Vs or Load Source ! Load Source R = 52, X, = 50, vs(t) = 100 sin(377f) V нЕ

For the circuit shown in Figure 7.4, determine apparent power S, real power P, reactive power Qand power factor PF. Also, draw the power triangle. The source is 120 volts.

A transmission line has aluminum conductors of a radius of 1.0 inches. If the aluminum conductors are replaced by steel conductors of an effective radius of 2.0 inches, the line: O A. None of the choices are correct O B. There is not enough information available to make any determination O C. Inductance would increase O D. Inductance would decrease but capacitance would increase O E. Inductance would increase

Ans:32.4 kV I have the solution but didnt understand.Kindly explain the solution.

A. A7 Hz B. 74.68 Hz Hz D. 50 Hz 49. A 30 ohm resistor is connected in parallel with ån inductor of inductive reactance Xr. The comblnątion is then connected in series with a capacitor of reactance Xc. What is the value of X, and Xc if the total impedance is 1.92 ohms? A.7.84, 7.34 B.47.4, 47.3 C. 44.8, 84.2 D. 84.7, 34.7 REE - April 1997

7.76 A three-phase motor is modeled by the wye-connected circult shown in Figure P7.76. At t = t1, a line fuse is blown (modeled by the switch). Find the line currents Ig, Iw, and Ig and the power dissipated by the motor in the following conditions: a. t4

1- A single phase line has two parallel conductors 3m apart. The radius of each conductor is 1.2 cm. calculate the loop inductance per km of the line. 2- A single phase line has two parallel conductors 4m apart. The radius of each conductor is 2m. Calculate the capacitance per km of the line.

Q2: A single-phase transmission line consisting of two conductors, the radius of each conductor is 0.4 cm, the distance between the conductors is three and half meters and the height above ground is eight meter. The capacitance in µF/km without effect -1 of ground is إجابتك The capacitance in µF/km with effect of -2 ground is

Fill in the table for a correctly wired duplex outlet (U.S. National Electric Code standards for voltage PARAMETER EQUATION and frequency). Note the used of double- subscript notation. You can assume a 0° phase reference for Vba(t). Vba(t) Vea(t) Vbe(t) Vba (Peak Phasor) Vea (Peak Phasor) Vbc (Peak Phasor) Vba (RMS Phasor) Vea (RMS Phasor) Vbc (RMS Phasor) A C