A single-phase, 60-Hz supply is connected to a load consisting of a 100 Ω resistor in parallel with a 50-µF capacitor. Find the source power factor. (Make sure to indicate leading or lagging PF)
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A single-phase, 60-Hz supply is connected to a load consisting of a 100 Ω resistor in parallel with a 50-µF capacitor. Find the source power factor. (Make sure to indicate leading or lagging PF)
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- Two balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at 0.9 power factor leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. (a) Determine the source current. (b) If the load neutrals are connected to the source neutral by a zero-ohm neutral wire through an ammeter, what will the ammeter read?Three identical impedances Z=3030 are connected in to a balanced three-phase 208-V source by three identical line conductors with impedance ZL=(0.8+j0.6) per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance (j60) per phase is connected in parallel with the load.Figure 2.26 shows three loads connected in parallel across a 1000-V(RMS),60Hz single-phase source. Load 1: Inductive load, 125kVA,0.28PF lagging. Load 2: Capacitive load, 10kW,40kvar. Load 3: Resistive load, 15kW. (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in F. Comment on the magnitude of the supply current after adding the capacitor.
- Design a power factor correction circuit with the value of parallel capacitance needed tocorrect a load of 179 kVAR at 0.85 lagging pf to unity pf. Assume that the load issupplied by a 110-V (rms), 60-Hz line.A 25 kVA, 240 V single phase source supply the rated power at the rated voltage to a motor at 0.8 power factor lagging. Find the capacitor bank in order to improve the power factor to 0.9 lagging connected to a motor.a. Calculate the real power, reactive power and current before capacitor bank is connected? b. Calculate the power and reactive power after capacitor bank is connected? c.What is kVA rating of capacitor bank QC?A single-phase circuit is placed across a 120-Vrms, 60-Hz source, with an ammeter, a voltmeter, and awattmeter connected. The instruments indicate 12 A,120 V, and 800W, respectively. Finda. The power factor.b. The phase angle.c. The impedance.d. The resistance.
- A load of 500 kVA operates at 0.6 lagging power factor on 1100V, 50 Hz mains. The power factor of the system is improved from 0.6 lagging to 0.95 lagging by using a delta connected capacitor bank. Assuming VA of the load remains constant, indicate the rating of the capacitor and find the additional kW that can be obtained.A series circuit composed of a resistance of 24 ohms, an inductance of 0.09 henry and a capacitance of 8 microfarad, is connected to a 120-volt 50-Hz supply. Calculate (a) the line current, (b) impedance of the circuit, (c) voltage drop, (d) total reactive power, (e) power factor.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?
- Circuit elements with an inductance of 200 mH, a capacity of 50 μF and a resistance of 10 Ω are connected in parallel. If the average value of 198 V sinusoidal AC voltage is applied to this system, find the line current, impedance and phase angle of the circuit. (Take the frequency as 60 Hz.)An industrial load of200KW has a powerfactor of 0.5 lagging. Agroup of synchronousmotors operating at apower factor of 0.8leading is installed andthe over-all power factorimproves to 0.75 lagging.Determine the KVArating of the synchronousmotors installed.Answer = 130.2354 KVAA load of 500 kVA operates on 1100 V, 50 Hz mains with power factor of 0.6 lagging. It is required to improve the power factor to 0.95 lagging by using the star connected capacitor bank. Assuming that the load KVA remains constant, suggest the rating of the capacitors.