9. Let the line voltage VL = 208 V and the wattmeter readings of the balanced system in Fig. 12 be P₁ = -560 W andP2 = 800 W. Determine: a. the total average power. b. the total reactive power. c. the power factor. d. the phase impedance.
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- electrical engineering department plzz solveWhich 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. 1/3A network is supplied by a 120 V rms, 60-Hz voltage source. An ammeter and a wattmeter indicate that 12 A rms is drawn from the source and 800 W are consumed by the network. Determine: a. The network power factor b. The network phase angle c. The network impedance d. The equivalent resistance and reactance of the network
- 2) Figure shows three loads connected in parallel across a 1000-V (rms), 60-Hz single-phase source. Load 1: Inductive load, ... kVA, 0.28 p.f. lagging Load 2: Capacitive load, ... kW, 40 kvar Load 3: Resistive load, 15 kW Determine the total (a) kW, (b) kvar, (c) kva, and (d) supply power factor. (Please determine the power values within the specified limits: Load 1 apparent power: 100-150 kVA, Load 2 active power: 5-20 kW. By considering the power values you determined yourself, solve the question.) Load Load DE 1 2 Load 3A non-sinusoidal quasi-square wave voltage v(t) is applied to a nonlinear load, resulting in a non-sinusoidal current i(t). The voltage and current waveforms are shown below. Assume any values of your choice for Vp (≤ 200 V) and Ip (≥ 5 A). 1. calculate the average power and net power factor of the load. 2. The total load harmonic distrotion (THD) of the load current, assuming the smallest frquency term as fundamental.1. a) Find the average power dissipated in the line shown.2. b) Find the capacitive reactance that when connected in parallelwith the load will make the load look purely resistive.3. c) What is the equivalent impedance of the load in (b)?4. d) Find the average power dissipated in the line when the capacitivereactance is connected across the load.5. e) Express the power loss in (d) as a percentage of the power lossfound in (a).
- 4.7. For the circuit below, calculate the value of Z₂ for maximum average power transfer to the load. In addition, determine the value of the maximum average power absorbed. (Hint: One approach is to find the open-circuit voltage and the short-circuit current.) j4 2 Vx -j2 n 16 Vx20 4/0° V ZLIf the voltage and current given below are suppliedby a source to a circuit or load, determinea. The power supplied by the source which isdissipated as heat or work in the circuit (load).b. The power stored in reactive components in thecircuit (load).c. The power factor angle and the power factor.˜VS = 7∠0.873 V ˜IS = 13∠(−0.349) A
- 2. A single-phase a.c. distributor AB is fed from end A and has a total impedance of (0-2 +j03) ohm. At the far end, the voltage VR = 240 V and the current is 100 A at a p.f. of 0-8 lagging. At the mid-point M, a current of 100 A is tapped at a p.f. of 0-6 lagging with reference to the voltage Vy at the mid-point. Calculate the supply voltage V and phase angle between V and Vg- [292 V, 2-6°] T 40 A1.26. A Y-connected load with an impedance of 12 - j15 per phase is con- nected to a balanced A-connected 208-V, 60-Hz, three-phase, positive phase-sequence supply. Determine (a) the line and phase voltages, (b) the line and phase currents, and (c) the apparent, active, and reactive powers in the load. Draw the phasor diagram and the power diagram.A Y-connected balanced three-phase source is feeding a balanced three-phase load. The voltage and current of the source coil are: Calculate the following: The rms phase voltage. The rms line-to-line voltage. The rms current in the source. The rms current in the transmission line. The frequency of the supply. The power factor at the source side, state leading or lagging. The three-phase real power delivered to the load. The three-phase reactive power delivered to the load. If the load is connected in delta configuration, calculate the load impedance.