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- A single-phase source is applied to a two-terminal, passive circuit with equivalent impedance Z=3.045, measured from the terminals. The source current is i(t)=22cos(t)kA. Determine the (a) instantaneous power, (b) real power, (c) reactive power delivered by the source, and (d) source power factor.One advantage of balanced three-phase systems over separate singlephase systems is reduced capital and operating costs of transmission and distribution. (a) True (b) FalseA single-phase transmission line has a resistance of 0.22 ohm and inductive reactance of 0.36 ohm. Find the voltage at the sending end to give 500kva at 2000V at the receiving end at a load power factor of 0.707 lagging. Also find the efficiency of transmission at this load.
- Using a test equipment, Vmax was found to be 5V while Vmin is 1V. The distance between voltage maximas is 14 cm and the first maximum was found to be 7 cm from the load. What is the load impedance if the characteristic impedance of the line is 75 ohms?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 lineThe real and reactive power of slack bus are determined after the power flow analysis.Select one:TrueFalse
- 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 power20/ For balanced three phase star connected load, the phase angle difference between VR and VY is 30 degrees. Select one: True FalseVan = 330∠510°, Vbn = 330∠270°, Vcn = 330∠390°" A POSITIVE PHASE SEQUENCE B NEGATIVE PHASE SEQUENCE
- A short 3-phase transmission line connected to a 33kV, 50 Hz generatingstation at the sending end is required to supply a load of 10 MW at 0·8lagging power factor at 30 kV at the receiving end. If the minimumtransmission efficiency is to be limited to 96%, estimate the per phasevalue of resistance and inductance of the line.Use the Y-Y circuit shown below,a)Solve for the phase voltage at load endb)Solve for the phase current.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. transformer