Find the value of resistance R and capacitive reactance Xc that will require a reactive power of -1540 VAR at 230 Volts rms source while drawing 10 amperes of rms current.
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- a) Write down the expression of instantaneous voltage for an AC voltage having a Peak value of 220 Volts and a frequency of 50 Hz provided at time t=0, the instantaneous voltage is 220 Volts. What is the instantaneous voltage of the source at time “t = 5 seconds” What is its RMS voltage? b) Two 200Ω resistances are connected in series with one 0.5 H Inductance and two 100μF Capacitance with the power supply of part (a). (i)Draw the circuit diagram of the above network (ii)What is the total impedance of the circuit (iii)What is the max current that flows through the Inductance? (iv)What is the max current that flows through each of the Capacitance? (v)What is the power dissipated in the circuit (vi)What is the power factor of the circuit (vii)What is the resonance frequency of the circuit? (viii) What is the maximum power dissipated by the circuit when it is in resonance1- When connected in series with a pure resistor R with resistance r and inductance L, three pairs of currents are 5A with a sinusoidal voltage application with an effective value of 100V. The voltage across the coil and resistor element is 80V and 30V. a-Find the power and power consumed by the coil alone? b- Find the power consumed by the system and the power factor? c- Draw the voltage triangle, impedance triangle and power triangle?What do you understand by Ferranti effect? Subject Power Transmission and Distribution
- In U.S. residences, electrical power is generally utilized at a nominal voltage of 120 V rms. What problems would become pronounced if the power distribution system and household appliances had been designed for a lower voltage (say, 12 V rms)? For a higher voltage (say, 12 kV)?Answer the following points in detail and rigorously. Instead of resorting to formulas, develop from basic principles (laws of voltages and currents, definition of electrical power, properties of phasors, among others). f) Suppose you know P and Q for a two-terminal element. What is the power factor of this element? When would you be ahead and when would you be behind? g) Suppose you know the equivalent resistance R and the equivalent reactance X of a two-terminal passive network. What is the power factor of this network? When would you be ahead and when would you be behind?A drilling machine is driven by a single-phaseinduction machine connected to a 110-V rms supply.Assume that the machining operation requires 1 kW,that the tool machine has 90 percent efficiency, andthat the supply current is 14 A rms with a power factorof 0.8. Find the AC machine efficiency.
- A 60-Hz 220-V-rms source supplies power to a load consisting of a resistance in series with an inductance. The real power is 1500 W, and the apparent power is 2500 VAR. Determine the value of the resistance and the value of the inductance.A current of 4 A flows when a neon lightadvertisement is supplied by a 110-V rms powersystem. The current lags the voltage by 60◦. Find thepower dissipated by the circuit and the power factor.. Determine the capacitance value that, when placed in parallel with this load, would produce a unity power factor. Assume that the source is 230 V at 60 Hz. The Q shown is a positive Inductive reactive power, which would have to be “offset” by the same value of Reactive Capacitance Power.
- Describe the operation of a power factor correction capacitor and its role in improving power efficiency.What is voltage stability? How is reactive power linked with the voltage stability in the power system? Write down the effect of ‘Load Tap Changer (LTC)’ on voltage stability and analyze very briefly using P-U (nose) curve.1. A motor load consists of a resistance of 6 Ohms in series with an inductance of 12 mH. Assume 120Vac, 60 Hz supply. a. What is the complex impedance of the load? b. What is the ac current through this load? c. What is theta, the angle between voltage and current through this load? d. What is the power factor? e. What capacitance should be added in parallel with this load to correct the power factor to 1? f. What is the current from the supply when the power factor is corrected?