For the circuit shown. Take Van = 120<0 Vrms, then the reading of the first wattmeter W1 is. W.* 4571 O2159 4482 3529
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- Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformerA high-voltage direct-current generating station delivers power to a city. The generator output voltage is V0 = 400 kV, the city is represented by resistance RL = 3918 ohms, and each wire of the transmission line round-trip between the station and city is represented by resistance RTL = 151 ohms. How much power (in mega watt) is lost along the transmission wire?If a load is symmetric with 50 ohm of series impedance and 13 ohms of mutual impedance, what are the sequence impedances? a. z11 = z22 = 63 ohm, z33 = 89 ohm, else 0 b. z11 = z22 = 33 ohm, Z00 = 76 ohm, else 0 c. z11 = z22 = 50 ohm, Z00 =89 ohm, else 0
- A Z0 = 50 Ω transmission line of length l = 4.25 m (with dielectric material with parameters εr= 4, µr = 1) is attached to a time-harmonic generator (V0rms = 30 V, Rg = 20 Ωf = 75 MHz). The line is terminated with a load ZL = 100 + j50 Ω.Write Matlab (or similar high level language) code to find the complex instantaneous voltagesand currents along the line and time averaged losses in the load and generator. Use this codeto make a movie of the instantaneous total voltage and current along the line, and plot thecomplex voltage and current for the line in the following two cases:a) Assume the line is losslessb) Assume the line has a small loss equivalent to R’ = 1.2 Ω/m please solve part bFor the single-phase power system below, find the transmission losses in Watts (assume that the transformers are ideal). Hint: Remember that loads can be represented by complex numbers in either rectangular or polar form.Under balanced operating conditions, consider the 3-phase complex power delivered by the 3-phase source to the 3-phase load. Match the following expressions, those on the left to those on the right. 0) Real power, Py (ii) Reactive power, Qu (ii) Total apparent power Sy (iv) Complex power, Sy (a) (V3 VLL. IL)VA (b) (V3 Vu sng) var (e) (V3 VLL. IL cos ø) W (d) Py +Qy Note that VLL is the rms line-to-line voltage, IL is the ms line current, and o is the power-factor angle.
- The load impedance ZL for the circuit shown is adjusted until maximum average power is delivered to ZL.1. a) Find the maximum average power delivered to ZL.2. b) What percentage of the total power developed in the circuit isdelivered to ZL?Estimate the distance over which a load of 15000 KW at p.f-0.8 lagging can be delivered by a 3-phase T.L having conductor each of resistance 0.8 2 per km the voltage at the receiving end is to be 132 KV and the losses in the line is to be 5% of received powerThe three-phase power and line-line ratings of the electric power system shown in Figure-1 are given below: G1:82 MVA 30 kV X=10% T1:72MVA 30/300 kV X=11% T2:72MVA 300/30 kV X=11% M:62MVA 25 kV X=9% 300 kV Z= 89+j179 Apply the knowledge of per unit system on above network and draw an impedance diagram showing all impedances in per unit when Sb =100MVA and Vb = 30 kv
- In the system given below, Za=Zb=Zc= (25+j5) Ω.a) Find the line currents?b) Calculate the total average, reactive and complex powers?a short three phase transmission line connected to 33kv 50 hertz generating station at starting and is required to supply a load of 10 MW at pointed start lagging power factor at 30 KV addresses in that is the minimum transmission efficiency is to be determined96% estimate the per face value of resistance and inductance of a lineA three-phase, 3-wires CBA System alternator, sending 3-phase voltages of 339.4 volt to the lines, having a delta connected load, with VCA is the reference vector. ZBC = 12.99 – j7.5 ZCA = 8.66 + j5 ZAB = 10 + j0 Determine the phase and line current b) draw the phasor diagram and c) true power generates by the generator neglect the line losses.