If in a Y- connected ac generator, each phase voltage has a magnitude of 90 Vrms, what is the magnitude of each line voltage Select one: O a. 90 Vrms b. 180 Vrms OG 155.88 Vrms O d. None of these
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- A load has a leading power factor. a) Is it a capacitive or inductive load? b) Is the reactive power positive or negative? c) Repeat for a load with lagging power factorThe reactance of a generator is given as 0.1 pu based on the generator of 17 KV, 300 MVA. Determine the pu reactance on a base of 17 KV, 250 MVA. New pu reactance is.......The 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......
- Assum rms for the phase currentA 220 Ω resistor is in series with an 80 mH inductor. The AC source is 48 at 1 kHz. The power factor is ________. Hint: Draw the circuit and get Vs and IsTwo three-phase alternators operate in parallel and the excitation is such that theinduced emfs are 1 kV/ph. The load admittance is (0,427 – j0,214) S. Theadmittance/phase of the machines are (0,0262 – j0,499) S and (0,0218 – j0,312) Srespectively. The emf of B leads A by 10°e. Calculate:(a) the terminal voltage(b) the current supplied by A(c) the power factor of B
- In capacitive AC circuit voltage is leading current O a. True O b. Falsewhat is the reactive power absorbed by the load ZL in VAR? Assume source is in rms3 X 0.1 1 2 XL = 0.2 to Eato oto O X = 0.1 X = 0.1 Above is the one-line diagram of a simple power system. Each generator is represented by an emf behind the subtransient reactance. All impedances are expressed in per unit on a common base. All resistances and shunt capacitance are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A symmetrical fault occurs at bus 1 through a fault impedance Z, =j0.08 per unit. a) Using Thevenin's Theorem, determine the impedance to the point of fault and the fault current in per unit. (2 Marks) b) Find the bus voltages and line currents during the fault. (2 Marks)
- Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)a) An electrical engineer is assigned to analyze the generator specification that produces a sinusoidal wave with no phase angle. The maximum e.m.f value of the generator is 120V over the period, T = 250 ms. i. Calculate the e.m.f value at coil position 80° and 1.75x rad. Determine the generated e.m.f at t = 150 ms. ii. ii. If the phase angle of the generator shifted to –25° during the measurement process. Evaluate the time, to produce the instantaneous e.m.fof 67V .