Chapter 5, Problem 5.59P

Q#5. Illustrate the variation of output power taken from the wind turbine? How the frequency in wind turbine is affected by excessive generation and load? Justify the relationship of frequency with power generation and load?

Source Transformation method I=? V50ohm=? P50ohm=?

For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ZLand ZLFind the value of the maximum average power transferred to ? (Can you write the steps in detail in sentences?)

*P5.75. Two loads-A and B - are connected in par- allel across a 1-kV rms 60-Hz line, as shown in Figure P5.75. Load A consumes 10 kW with a 90-percent-lagging power factor. Load B has an apparent power of 15 kVA with an 80- percent-lagging power factor. Find the power, reactive power, and apparent power deliv- ered by the source. What is the power factor seen by the source? 1 kV rms 60 Hz + Line 0 0 A B Figure P5.75 IB 4

P5.6. Find the complex impedance in polar form of the network shown in Figure P5.6 for w = 500. Repeat for w = 1000 and w = 2000. 100 mH 50 Ω 10 μF Figure P5.6

Discuss the concept of reactive power and its role in grid stability.

Two loads, A and B, are connected in parallel across a 1-kV-rms 60-Hz line, as shown in Figure P5.81. Load A consumes 10 kW with a 90 percent lagging power factor. Load B has an apparent power of 15 kVA with an 80 percent lagging power factor. Find the power, reactive power, and apparent power delivered by the source. What is the power factor seen by the source? Repeat Problem P5.81 if load A consumes 5 kW with a 90 percent lagging power factor and load B consumes 10 kW with an 80 percent leading power factor.

In the T-Model method which among these are divided into two halves. a. Both (A) and (B) b. None of these c. Shunt capacitance d. Series impedance

A 120V adjustable frequency ac source is connected in series with a resistor, an inductor, and a capacitor. At 60Hz, the resistance is 5 ohms, the inductive reactance is 3 ohms, and the capacitive reactance is 4 ohms. Compute: (a)load impedance at 60Hz  (b)  value of the capacitance and inductance Explain each step.