Four impedance loads are connected in parallel across a source as shown below. Load 1 absorbs 3 kW and delivers 6 kvars, Load 2 absorbs 6 kW and delivers 3 kvars, Load 3 absorbs 6 kVA at 0.8 leading and Load 4 absorbs 3 kVA at 0.6 lagging. Show that the current supplied to each load is equal to the total current generated. 240 V(rms) Z3 || Z.| Z2
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- Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?The rms value of v(t)=Vmaxcos(t+) is given by a. Vmax b. Vmax/2 c. 2Vmax d. 2VmaxThe 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.
- S. 20020°V L rms S. In the circuit in the figure; • L1 load draws 15 kVA with lagging power factor 0.6. • The load L 2 draws 6 kVA with a leading power factor of 0.8. According to this; What is the value of the reactive power for the load L, ? O 9000 O -3600 O 2700 O 12000 O 4800 O 4500Two relays each with 20-ohm resistance and 0.16-henry inductance are connected in series. What is the equivalent impedance?a. 20 + j102.2 ohms c. 20 + j95.32 ohmsb. 20 + j120.63 ohms d. 10 + j25.32 ohmsA 60 Hz sinusoidal voltage v = 141sinwt is applied to a series RL circuit. The values of the resistance and the inductance are 3 ohms and 0.016 henry respectively. a) Compute the rms value of the current and its phase angle with respect to the voltage.b) write the expression of the instantaneous current.
- The values of the elements for the given circuit are given below.The maximum average power that can be transferred to the ZL load iswhich one?R1 = 400 OhmsL = 1000j OhmsR2 = 500 Ohms8. The total power supplied to a balance delta load is found in the same way as for a balance wye load. True False Either Neither 12. A load of 20 + j35 ohms is connected across a 220 V, 60 Hz supply. Find the reactive power of the load in var. 595 2420 1042 1382 13. A type of DC source where the characteristic output voltage has perfect unidirectional waveform and is based on electrochemical principle. Generator Inverter Converter Battery 14. Calculate the Rf of a circuit whose impedance is 20+j35 and current of 2A. 0.86 0.91 0.50 0.71 15. What capacitor shall be installed in parallel with a circuit to achieve a unity power factor if the reactive power of a circuit is 200VARS and the voltage is 100V. 80.45 microfarad 53.05 microfarad It's already in unity 62.45 microfarad)Two complex loads Z1 and Z2 are connected in parallel and powered by a value voltage effective 7.2 kV and frequency 60 Hz. The first load has a power of 50 kVA and a factor of rear power of 0.9. The second charge has a power of 45 kW and a rear power factorof 0.91. Determine in steady state the kVAR power and the capacity required to correct the Total power factor to a value of 0.97 rear.
- Three-phase supply from utility The diagram shown in figure has two three- phase loads that form part of a manufacturing plant. They are connected in parallel and require 4.16 kV rms. Load 1 is 1.5 MVA, 0.75 lag pf A connected. Load 2 is 2 MW, 0.8 lagging pf, Y connected. The feeder from the power utility's substation transformer has an impedance of 0.4+j0.8 2/phase. Deter- mine the following: (a) The required magnitude of the line voltage at the supply. (b) The real power drawn from the supply. (c) The percentage of the real power drawn from the supply that is consumed by the loads. 0.4 Ω j 0.8 Ω 0.4 Ω j 0.8 Ω 0.4 Ω j 0.8 Ω m Load 1 am Load 2There is an installation with two equal triphasic loads of 300 kVA each and a power factor of 0.9 lagging. When connecting a pure reactive element in parallel, the reactive power at the entrance of the installation is 150 kVARS, with a lagging power factor. We can say that: a) A bank of reactors was connected and the fp deteriorated. b) A capacitor bank was connected and the pf deteriorated. c) A bank of reactors was connected and the fp improved. d) A capacitor bank was connected and the pf improved. e) None of the aboveWhich of the following descriptions IS NOT correct for loads in power systems? A. The purely resistive load absorbs the real power from the power grid B. The purely inductive load absorbs the positive reactive power from the power grid C. The purely capacitive load absorbs the positive reactive power from the power grid. D. The average value of the instantaneous power through loads is equal to its real power. In an ac circuit, power factor correction or improvement is achieved by A. Connecting a resistor in parallel with the inductive load B. Connecting an inductor in parallel with the inductive load C. Connecting a capacitor in parallel with the inductive load A balanced delta-load can be converted to an cquivalent balanced wye- load by dividing the delta-load impedance by A. square root of 3 В.3 C. 1/3