7.18 A single-phase motor draws 220 W at a powerfactor of 80 percent (lagging) when connected across a200-V, 60-Hz source. A capacitor is connected inparallel with the load to give a unity power factor, asshown in Figure P7.18. Find the required capacitance.ellww

The circuit diagram of the motor is shown below: First, we will calculate the equivalent impedance…

Answered: 7.18 A single-phase motor draws 220 W…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.13MCQ

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Similar questions

For the circuit shown in Figure P7.43, assume thatvg = 120 V rms. Finda. The total resistance seen by the voltage source.b. The primary current.c. The primary power.
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For an ac circuit consisting of a load connected to a Thévenin circuit, is it possible for the load voltage to exceed the Thévenin voltage in magnitude? If not, why not? If so, under what conditions is it possible? Explain.
Analyze the impact of harmonics in power systems and propose mitigation techniques.
Given that a nonzero AC voltage source is applied, what can you say about whether the power, reactive and complex power are positive, negative, or zero for a load with a lagging Power Factor. Repeat your analysis for this load when connected in parallel with a pure capacitor. Consider all cases and justify your answer(s).
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. Determine the capacitance value that, when placed in parallel with this load, would produce a unity power factor. Assume that the source is 230 V at 60 Hz. The Q shown is a positive Inductive reactive power, which would have to be “offset” by the same value of Reactive Capacitance Power.
A 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.)
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The instantaneous voltage across a circuit element is v(t)=400sin(t+30)volts, and the instantaneous current entering the positive terminal of the circuit element is i(t)=100cos(t+10)A. For both the current and voltage, determine (a) the maximum value, (b) the rms value, and (C) the phasor expression, using cos(t) as the reference.
7- In order to improve the power factor of equipment operating at lagging power factor, a capacitor is connected _______________. a. Series and parallel b. In series with the equipment c. In series-parallel with the equipment d. In parallel with the equipment

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7.18 A single-phase motor draws 220 W at a power factor of 80 percent (lagging) when connected across a 200-V, 60-Hz source. A capacitor is connected in parallel with the load to give a unity power factor, as shown in Figure P7.18. Find the required capacitance. ell ww