sketch a labeled equivalent circuit of a 3 phase synchronous generator having an output voltage E supplying load P + jQ through an impedance R + jX when voltage at the load is V

5) A balanced three-phase source of 4160 V is feeding a balanced three-phase induction motor through a cable of negligible impedance. The induction motor draws 400 kW at 0.8 power factor lagging. Calculate the reactive power consumed by the induction motor. Design two different techniques to improve the overall power factor from 0.8 to 0.96 lagging. Show the effectiveness of your design through a numerical example. i) ii)

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.)

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?

In the equivalent circuit, when the slipio 1 Cire at stert) rotor cirouit has much lower impedance than magnetising eircuit. At start approximates to: Iph Cfull) Toad' Ri Vph. craduced) XI+x² Cequele Xea) can be obtained from the input reactive R1+ RZ' CRTeStator Resistance & RZé Ro tor Resistanca) c20 be obtained from the input. powerand current pawer and current Total real power P=3 CIine) CR the) W Total absgrbed nductor reactive pawer Qy = 3E Lined. Xeq VAr The mea sured eddy corrent prake torque O.48 Nm. The line corrent is 4.94A, Total (3ph) inputreal power is 214.7W. The Statorphae resistance is Voltage CVey)s 29.V, stahr What is Xeq, R1+R2, R), R2

A single-phase AC voltage controller has a resistive load R = 10 Ohm, and the RMS input voltage is Vs = 230 V, 60 Hz. The delay angle is 120 degree. Then the RMS output voltage is: Select one: O a. 101 V O b. 39 V O c. None of the above O d. 143 V O e. 215 V

A 500 MVA synchronous machine has H, = 5.6 MJ/MVA and a 1200 MVA machine has H₂ = 2.0 MJ/MVA. The two machines operate in parallel in a power station. What is the equivalent. H constant for the two, relative to a 100 MVA base?

A 40kW induction motor with a lagging power factor of 0.76 is supplied by a 120Vrms 60Hz sinusoidal voltage source. find the capacitance needed in parallel with the motor to raise the power factor to (a) 0.9 lagging and (b) 1.0

A single phase AC generator winding has an effective resistance of 0.2 ohm and synchronous reactance of 2.2 ohms. Find the generated emf when the load is 50A at a terminal voltage of 500 V at pf 0.8 leading.

Question 1. An industrial load consisting of a set of induction motors connected to a 220 V, 60 Hz single phase source consumes 50 kW with a back power factor of 0.8. The power factor will be increased back to 0.95 by connecting a set of capacitors in parallel. For this, calculate the VA value that the connected capacitor will provide.