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A source supplies power to the following three loads connected in parallel: (1) a lighting load drawing
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Chapter 2 Solutions
EBK POWER SYSTEM ANALYSIS AND DESIGN
- Is the power factor in Question 6 a leading or lagging power factor? Explain your answer.arrow_forwardA single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)arrow_forwardCalculate the apparent power, real power, andreactive power for the circuit shown in Figure.Draw the power triangle. Assume a.) f = 50 Hz. b.) f = 0 Hz (DC)arrow_forward
- 2. 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?arrow_forwardA source supplies power to the following three loads connected in par- allel: (1) a lighting load drawing 10 kW, (2) an induction motor drawing 10 kVA at 0.90 power factor lagging, and (3) a synchronous motor operating at 7.5 kW, 85% efficiency and 0.95 power factor leading. Deter- mine the real, reactive, and apparent power delivered by the source. Also, draw the source power triangle.arrow_forwardThe reactive power output of an alternator is limited by load angle True Falsearrow_forward
- Find the RMS value of V)-100 sin(377t+76) Varrow_forward41. 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 Warrow_forward244. The apparent power drawn by an a.c. circuit is 20 kVA and reactive power is 12 kVA. The real power in the circuit in kW will bearrow_forward
- 1 Calculate average and RMS value of the voltage waveform given in Figure. 4V %3D t(ms)- 4Varrow_forwardA single-phase motor draws 220 W at a power factor of 0.8 lagging when connected across a 240 V rms, 60-Hz source. A capacitor is connected in parallel with the load to produce a unity power factor. Determine the required capacitance.arrow_forwardLance Smile operated two loads in parallel. The loads draw a total of 3kW at a 90% power factor lagging operating at a 230 Vrms 60-hz voltage source. Load 1 is taking 1000 W at 80% power factor lagging. Determine the following: a. The power factor of the second load. b. If a capacitor is connected in parallel with the loads, what is the value of the capacitance needed to correct the power factor to 95% lagging for the combined load.arrow_forward
- Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage LearningDelmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning