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Phase impedances are changed to a 6-O resistance in parallel with an 8-O capacitive reactance.
A balanced ? load having a 20-O resistance in each leg is connected to a three-phase, three-wire, Y-connected generator having a line voltage of 208 V.
Determine the magnitude and phase angle of the voltage across each phase of the load: Van, Vbn, and Vc.
Each phase impedance is changed to a 6.8-O resistor in series with a 14-O inductive reactance.
Each phase impedance is changed to an 18-O resistance in parallel with an 18-O capacitive reactance.
Phase impedances are changed to a 100-O resistor in series with a capacitive reactance of 100 O.
The phase impedances are changed to a 3-O resistor in parallel with an inductive reactance of 4 O.
Find the magnitude of the unknown voltages and currents.
If VL = 240 V, ZL = 20-O resistor, Ip = 0.05 A, and Ns = 50, find the number of turns in the primary circuit .
Find the transformation ratio required to deliver maximum power to the speaker.
The new load voltage if we assume the transformer to be ideal with a 4 : 1 turns ratio. Compare the result with that of part e.
If the resistive load is replaced by an inductive reactance of 20 O:
Determine the voltage across Re and Xe, and find the reflected load.
Discuss in your own words the frequency characteristics of the transformer.
Determine the input impedance to the air-core transformer of Figure.
Find the current rating of the secondary if the 120 V is the secondary voltage.
For the center-tapped transformer of Fig. where Np= 100, Ns = 25, ZL = R?0° = 5 O?0°, and Ep = 100 V?0°.
For the multiple-load transformer of Fig. where N1 = 120, N2 = 40, N3 = 30, Z2 = R2 ?0° = 12 O?0° .
Calculate the magnitude of VC at resonance (fp). Determine the power absorbed at resonance.
Sketch the curve of VC versus frequency. Indicate its peak value, resonant frequency, and band frequencies.
Determine Ql and Qp at fp after a source conversion is performed.
Show that the resonant frequency is in fact 40 kHz, the cutoff frequencies are as calculated, and the bandwidth is 1.85 kHz.
Find fp and fm for the parallel resonant network of Fig. , and comment on the resulting bandwidth .
What is the power dissipated in the circuit at the half-power frequencies?
Write a program to provide a general solution for the network of Fig.(A).