8.8 Calculate ZL for maximum average power transfer in the circuit, and find the maximum average power delivered to the load.
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![8.8 Calculate Z₁ for maximum average power transfer in the circuit, and find the
maximum average power delivered to the load.
24/0° V
12/0° V
202
-j20
j202
Z₁
Answer
ZL=2-j22
45W
PL
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- Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?An alternating current varying sinusoidally with a frequency of 50 Hz has anrms value of 20 A.a) Determine the instantaneous value at 0.0025 seconds.b) Determine the instantaneous value, 0.0125 seconds after passingthrough a positive maximum value.c) At what time, measured from a positive maximum value, will theinstantaneous current be 14.14 A?The values of the elements for the given circuit are given below.The maximum average power that can be transferred to the ZL load iswhich one?R1 = 400 OhmsL = 1000j OhmsR2 = 500 Ohms
- Consider the system in the figure to the right. The Zbus for the system is given as follows: [j0.411 j0.310 j0.3541 Zbusj0.310 j0.446 j0.333 Lj0.354 j0.333 j0.450] j0.8 1.28/0 ele j0.2 vor j2.0 j0.5 m j0.4 m 2 a) Find the voltage at each bus. b) Find the current drawn by a capacitor having a reactance of 5.0 PU connected from bus 3 to the reference. c) Find the change in voltage at each bus when the capacitor is connected at bus 3. d) Find the voltage at each bus after connecting the capacitor. j1.0 1.20/30°Ooredoo 876% D 9:31 Red Bull MOBILE Assignment EP se..6c205abd8b27a - Saved Q1. A square waveform with following specifications RMS Voltage 163.21 Time for two cycle 35ms Sketch the Square waveform. [1] Q2. A coil impedance of 680 is connected and the circuit has capacitance of 0.002mF isAssum rms for the phase current
- Draw the power factor triangle showing the different labelled sides. Illustrate a lagging power factor using a sinusoidal waveform. (d) List 2 negative effects of a poor power factor (e) How can a lagging power factor be corrected?8. The total power supplied to a balance delta load is found in the same way as for a balance wye load. True False Either Neither 12. A load of 20 + j35 ohms is connected across a 220 V, 60 Hz supply. Find the reactive power of the load in var. 595 2420 1042 1382 13. A type of DC source where the characteristic output voltage has perfect unidirectional waveform and is based on electrochemical principle. Generator Inverter Converter Battery 14. Calculate the Rf of a circuit whose impedance is 20+j35 and current of 2A. 0.86 0.91 0.50 0.71 15. What capacitor shall be installed in parallel with a circuit to achieve a unity power factor if the reactive power of a circuit is 200VARS and the voltage is 100V. 80.45 microfarad 53.05 microfarad It's already in unity 62.45 microfarad41. Two ac sources feed a common variable resistive load as shown in figure. Under the maximum power transfer condition, the power absorbed by the load resistance R, is lall 6 2 j8 2 6 2 11020 ( 0706 O9020° (a) 2200 W (b) 1250 W (c) 1000 W (d) 625 W
- Q38 - Q40 refer to the table below: The voltage in a 60 Hz, 1-phase system has the following harmonic content: Harmonic Number Rms value 1 120 V 3 20V 5 9V Use this information to answer the questions Q25 to Q27. Q38. What is the rms value of the resulting current when this voltage is applied across a 100 resistive load? (a) 14.9 A (b) 12.2 A (c) 12.0 A (d) 3.9 A (e) 2.2 A Q39. What is the rms value of the resulting current when this voltage is applied across a 60 inductive load? (a) 24.83 A (b) 23.58 A (c) 20.33 A (d) 20.03 A (e) 20.00 A Q40. What is the rms value of the resulting current when this voltage is applied across a 69 capacitive load? (a) 24.83 A T (b) 23.58 A 20.99 A 20.36 A 20.00 A (c) (d) (e) 11Two relays each with 20-ohm resistance and 0.16-henry inductance are connected in series. What is the equivalent impedance?a. 20 + j102.2 ohms c. 20 + j95.32 ohmsb. 20 + j120.63 ohms d. 10 + j25.32 ohmsSine wave A has a positive-going zero crossing at 20°. Sine wave B has a positive-going zero crossing at 35°. Determine the phase angle between the two signals. What signal lags ? A A-connected system can have wires. The (resultant) voltage between the hot legs (120V) is . The phase angle between the phase voltage and the line voltage of a A-connected generator is degrees. The phase current produced by a certain 240v, Y-connected generator is 12A. The corresponding line current is A certain Y-connected generator produces phase voltages of 30V. The magnitude of the line voltages are When the turns ratio of a transformer is 25 and the primary ac voltage is 6V, the secondary voltage is
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