Analyse the methods that improve the power factor of a electrical circuit.
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Subject - Design electrical circuits for single phase AC networks
Question - Analyse the methods that improve the power factor of a electrical circuit.
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- A balanced -connected impedance load with (12+j9) per phase is supplied by a balanced three-phase 60-Hz,208-V source, (a) Calculate the line current, the total real and reactive power absorbed by the load, the load power factor, and the apparent load power, (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the -load currents. Use Vab as the reference.Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toThe 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.
- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsThe real power delivered by a source to two impedances, Z1=4+j5 and Z2=10 connected in parallel, is 1000 W. Determine (a) the real power absorbed by each of the impedances and (b) the source current.The three-phase source line-to-neutral voltages are given by Ean=100,Ebh=10+240, and Ecn=10240volts. Is the source balanced? (a) Yes (b) No
- Describe the concept of three-phase power in electrical systems and its significance in power distribution.Power Transmission and Distribution Discuss the advantages and disadvantages of single-phase and three-phase systemDiscuss the concept of microgrids and their potential benefits for localized power distribution.
- Subject - Design electrical circuits for single phase AC networks Question - Compare the effect of varying resistance, capacitance and inductance in a pararllel and series AC circuits on voltage resistance and impedance.What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generatorIs it possible to measure the phase-shift angle in an AC single-phase circuit by an indirect method using an ammeter and a voltmeter? - Yes, but an instrument must be added to measure the active resistance of the load. - Yes, but an instrument must be added to measure the active power dissipated by the load. - Yes, but an instrument must be added to measure the frequency.