What is the DC resistance per phase? What is the effective resistance per phase?
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A generator is rated 100 MW, 13.8kV and 90% power factor. The effective
resistance is 1.5 times the ohmic resistance. The ohmic resistance is
obtained by connecting two terminals to a DC source. The current and
voltage are 87.6 A and 6 V respectively. What is the DC resistance per
phase? What is the effective resistance per phase?
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- For the circuit element of Problem 2.3, calculate (a) the instantaneous power absorbed, (b) the real power (state whether it is delivered or absorbed). (c) the reactive power (state whether delivered or absorbed). (d) the power factor (state whether lagging or leading). [Note: By convention the power factor cos() is positive. If | | is greater than 90, then the reference direction for current may be reversed, resulting in a positive value of cos() ].The voltage v(t)=359.3cos(t)volts is applied to a load consisting of a 10 resistor in parallel with a capacitive reactance XC=25. Calculate (a) the instantaneous power absorbed by the resistor, (b) the instantaneous power absorbed by the capacitor. (c) the real power absorbed by the resistor, (d) the reactive power delivered by the capacitor, and (e) the load power factor.Two balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at 0.9 power factor leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. (a) Determine the source current. (b) If the load neutrals are connected to the source neutral by a zero-ohm neutral wire through an ammeter, what will the ammeter read?
- A source supplies power to the following three loads connected in parallel: (1) a lighting load drawing 10kW. (2) an induction motor drawing 10kVA at 0.90 power factor lagging, and (3) a synchronous motor operating at 10hp,85 effIciency and 0.95 power factor leading (1hp=0.746kW). Determine the real, reactive, and apparent power delivered by the source. Also, draw the source power triangle.Let a voltage source v(t)=4cos(t+60) be connected to an impedance Z=230. (a) Given the operating frequency to be 60 Hz, determine the expressions for the current and instantaneous power delivered by the source as functions of time. (b) Plot these functions along with v(t) on a single graph for comparison. (c) Find the frequency and average value of the instantaneous power.Don't use other platforms answer and also don't use chatgpt. A 3 phase 6000 kVA, 6600V, Y connected 2 pole 60 Hz alternator has the following characteristics: a. Field current= 125A, Open Circuit Voltage line value=8000V, Short circuit current=800A At full load the resistance drop is 3%. Find voltage regulation at power factor of 0.8 lagging.
- A 25 kVA, 240 V single phase source supply the rated power at the rated voltage to a motor at 0.8 power factor lagging. Find the capacitor bank in order to improve the power factor to 0.9 lagging connected to a motor.a. Calculate the real power, reactive power and current before capacitor bank is connected? b. Calculate the power and reactive power after capacitor bank is connected? c.What is kVA rating of capacitor bank QC?A 3 phase synchronous generator has a synchronous reactance Xs of 9 Ω perphase, a no-load line to neutral AC voltage E of 12 kV and a line to line terminalvoltage of V of 17.3 kV.(a) Derive the formula for the 3 phase power produced by the generator in terms ofthe power angle δm, |V |, |E|, and Xs. (δm is the angle between E and V ).(b) The power angle δm = 30 degrees. Calculate the 3 phase real power delivered to thegrid at the terminals of the generator.(c) The real power increases when the power angle δm increases, but there is amaximum possible theoretical power that the generator can produce. Calculate themaximum 3 phase real power. Solve A-CConsider the following power system model with the following entities:i. A generator generates a sinusoidal waveform with amplitude of 300 V and angular frequency of 5 radians,ii. The transmission line has a resistance of 1Ω, andiii. A capacitive load with a value of 2F presents at the end of the system. Answer the following questions:(a) Draw the relevant diagram and label all entity values of the power system as described above.(b) Replacing the real source in Figure from part (a) with a complex source, find the response of the steady-state capacitor voltage in time-domain.(d) Repeat the sub-question (a) above, now showing calculations in s-domain.
- Consider the following power system model with the following entities:i. A generator generates a sinusoidal waveform with amplitude of 300 V and angular frequency of 5 radians,ii. The transmission line has a resistance of 1Ω, andiii. A capacitive load with a value of 2F presents at the end of the system. Answer the following questions:(a) Draw the relevant diagram and label all entity values of the power system as described above.(b) Replacing the real source in Figure from part (a) with a complex source, find the response of the steady-state capacitor voltage in time-domain.(c) Repeat the sub-question (a) above, now showing calculations in frequency-domain.(d) Repeat the sub-question (a) above, now showing calculations in s-domain.Q.1 A 5000 kVA, 6600 V , 3 - phase , star connected alternator has a resistance of 0.75 ohm per phase. Estimate by zero power factor method the regulation for a load of 500 A at power factor (a) unity, (b) 0.9 leading and (c) 0.71 lagging, form the open circuit and full load, zero power factor curves: Field current, A Open circuit voltage, V ZPF curve, V 32 3100 0 50 4900 1850 75 6600 4250 100 7500 5800 140 8300 7000Which 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