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An Industrial Plant has a load of 2,500 KVA at an average power factor of 0.6 lagging. Neglecting all losses; Calculate: a) the KVA input to a synchronous condenser for an over-all power factor of unity. b) The total KW load.
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- The output of a station with two alternators in parallel is 40MW at 0.75 power factor lagging. One machines is loaded to 20,000KW at 0.8 power factor lagging. Determine the: a. KVA rating and power factor of the load b. KVA rating and power factor of the other alternator6. 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.fQ.1) A single phase load consisting of 5 2 in series with an inductance of 0.02297 H is operated in a phase control mode with a of 90°. The source is 240 V RMS, 60HZ. Find: a) Draw the waveform of VTI and VR. b) Find the conduction angle (6). c) Calculate the RMS value of load current. d) Find the power factor e) What is the minimum value of a for which phase control is in effet. f) Find the size of the first three terms in the Fourier series for the current. T Zoom
- A 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.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. 1/3The p.u. impedance value of an alternator corresponding to base values of 13.2 kV and 30 MVA is 0.2 p.u. Then the p.u. impedance value of an alternator for the new base values of 13.8 kV and 50 MVA is......
- Two alternators A and B operate in parallel and supply a load of 15MW at 0.5 power factor lagging. a) By adjusting steam supply of Alternator A, its power output is adjusted to 6MW and by changing its excitation, its power factor is adjusted to 85% lagging. Find the power factor of Alternator B. b) If steam supply of both machines is left unchanged, but excitation of Alternator B is reduced so that its power factor becomes 85% leading. Find the new power factor of Alternator A.Two parallel loads are connected to a 120 volt rms, 60 Hz power line. One load absorbs 10 k watts at 0.8 power factor lagging. The second load absorbs 4 k watts at 0.9 power factor leading. Determine the real (watts) and reactive (VARS) power of the combined load.A 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.
- One side of a transformer has What is the voltage (in V rms) at the secondary? 1,800 turns while the other side has 450 turns. The high voltage side is connected to a 240 Vrms source. The low What is the current (in A rms) at the secondary? What is the current (in A rms) out of the source? What is the value of the load impedance when referred to the primary? • Referred impedance = voltage side (secondary) is connected to an impedance ZL = 20 + j10 Q. Provide at least 4 digits after the decimal point. +j_ N What is the value of the source voltage (in V rms) when referred to the secondary?a load of 15 mva with power factor 0.86 lagging is given. Calculate the reactive power delivered by shunt capacitors to increase power factor to 0.9 laggingThe 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)?