Refer to the circuit shown in Fig. 11.88. (a) What is the power factor? (b) What is the average power dissipated? (c) What is the value of the capacitance that will give a unity power factor when connected to the load? 120 Vrms 60 Hz C Z=10+j1292
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- An induction motor draws 45 kW at a 73% power factor from a 16 AC line. a) What is the phase angle? b) What is the reactive power? c) What is the apparent power? A E A/ d) How many standard 15 kVAR and/or 25 kVAR capacitors are needed to improve the power factor without producing a leading power factor? A 15 kV AR capacitor(s) A/25 kVAR capacitor(s) e) What is the new power factor (round to three decimal spots)?a) Calculate the power factor of the load shown in the figure without the capacitor. b) Determine the capacitance that will improve the power factor to unity (1.0). Function Generator 1 KHz 5 V rms OV DC offset Ground C 5 mH 30 ΩPART 1 The voltage across a 100+j25 Q impedance is 230230° V. The power factor of the load is 0.97 lagging. a) What is the real power absorbed by the load? Answer: W b) What is the reactive power absorbed by the load? VAR Answer: A generator is producing 2 kW at 0.85 pf lead. a) What is the reactive power produced by the generator? VAR Answer: b) What is the apparent power of the generator? VA Answer: c) If the voltage at the generator terminals is 440 Vrms, what is the current (in rms)? Answer: A
- The following signal with maximum value of 1. Determine: a) Instantaneous value at t= 1800 ms. b) RMS value c) Average value Vsal 0*45* 180* 360*A 10.8-2 resistor, a 11.8-µF capacitor, and a 16.4-mH inductor are connected in series with a 130-V generator. (a) At what frequency is the current a maximum? (b) What is the maximum value of the rms current? Note: The ac current and voltage are rms values and power is an average value unless indicated otherwise. (a) Number i Units (b) Number i UnitsA sinusiodal voltage having maximum amplitude of 680 V is applied to the terminals of 65 Ohm resistor. Find the rms value of current in the resistor. (Unit: A) Submit Answer
- 1. A sinusoidal alternating voltage has an RMS value of 440 V and a frequency of 50 hz. It crosses the zero axis in a positive direction when t=0. Determine a) the time before passing through its negative maximum reaches the value of 225 V, b) the time to reach a value of 300 V before coming to a period.1. A motor load consists of a resistance of 6 Ohms in series with an inductance of 12 mH. Assume 120Vac, 60 Hz supply. a. What is the complex impedance of the load? b. What is the ac current through this load? c. What is theta, the angle between voltage and current through this load? d. What is the power factor? e. What capacitance should be added in parallel with this load to correct the power factor to 1? f. What is the current from the supply when the power factor is corrected?Determine the total complex, apparent, average, and reactive power. Sketch the power triangle
- A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following: e. Reactive power supplied by the sourcef. Apparent power of the circuitg. Power factor of the entire circuit2. Three series loads are drawing 20A ms current through a 60HZ source. Load 1 is an 400W, 0.8 lagging induction motor. Load 2 is a 500VA, 0.6 lagging power factor and load 3 is a 2 ohm incandescent bulb. a) What is the total VA of the combined load? b) What is the overall PF of the combined load? c) What RMS voltage is the combined load operating? d) What capacitor VAR must be installed in parallel to the combine load to improve its overall PF to unity? e) What is its approximate capacitance in microfarad?1. Calculate the complex power delivered to each passive component of the circuit in figure, and determine the power factor of the source. 2. What value of capacitance must be added in parallel to the 10 Q resistor to increase the PF of the source to 0.95 at 50 Hz? j30 Q 50/-17° V rms ( L -j25 Q 46 102 15Ω