A three-phase, Y-connected synchronous generater supplies current of 10 A having phase angle of 20º lagging at 400 V. Find the load angle if Xs = 10 ohms per phase. Assume Rs to be negligible. Also, calculate the total generated real and reactive power.
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A three-phase, Y-connected synchronous generater supplies current of 10 A having phase angle of 20º lagging at 400 V. Find the load angle if Xs = 10 ohms per phase. Assume Rs to be negligible. Also, calculate the total generated real and reactive power.
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- 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 componentsA synchronous generator has been synchronized to an infinite grid of 13.8 kV and 60 Hz. The generator prime mover C/C is such that the no-load frequency is 62.5 Hz and the power slope is 1 MW/Hz. The AVR C/C (The reactive power against the terminal voltage C/C) is such that the zero reactive power voltage is 14.6 kV, while the slope is 0.4 MVAR/kV. Calculate (a) the kVA loading of the generator and its power factor. (b) the settings of the prime mover and AVR such that the generator delivers 3 MW at 0.85 lagging power factor.1980628cmid 11616 For reactive load, the power factor is equal to Select one: O a. 1 O b. 90 O c. 2 O d.0 If the voltage V, = 800 mV, then the current flowing in the primary winding Ip is: j2on Select one: O a. None of these O b. l, =40<0° mA O c.l, = 0.320<90° A O d. Ip =320<-90° mA if a Load absorbs an average power of 8 kW at a lagging power factor of 0.5 Select one: O a. -8000 + j13856.4 VA O b. None of these O c. 8000 - j13856.4 VA O d. 8000 - j13856.4 VA estion-299141-3 freactive power is
- There 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 aboveA 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.The total power drawn by the two-impedance load in parallel is 26kW at 0.98 power factor lagging, it is being supplied by a 230-volts AC source. One of the loads (Load 1) takes 16kVA at 0.77 power factor lagging. What is the reactive power of the unknown impedance (Load 2)?
- Which 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. 1/3Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6 ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V. a.) Find the currents flowing from transformers to the load. b.) Find the active powers that transformers transfer to the load.Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V. a.) Find the currents flowing from transformers to the load. b.) Find the active powers that transformers transfer to the load.
- Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.In an alternator delivering lagging pf load, the excitation emf leads terminal voltage by the power angle True False The regulation of an alternator is likely to be negative in case of resistive load True False The short circuit characteristic of an alternator is always non- linear True False6. If a power system has 10,000 kVA capacity, operating at 0.7 lagging power factor and cost of synchronous capacitors to correct the p.f is $10.5/kVA.Determine the cost involved and also required leading reactive power to increase the power factor to (a) 0.85 lagging p.f