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If each phase impedance is changed to a 10-O resistor in series with a 20-O inductive reactance.
Each phase impedance is changed to a 22-O resistor in parallel with a 22-O inductive reactance.
A balanced D load having a 220-O resistance in each leg is connected to a three-phase, D-connected generator having a line voltage of 440 V.
A balanced, three-phase, D-connected load has a line voltage of 200 and a total power consumption of 4800 W at a lagging power factor of 0.8.
Each phase impedance is changed to a 12-O resistor in series with a 16-O capacitive reactance.
Phase impedance is changed to a 10-O resistor in parallel with a 10-O capacitive reactance.
The phase impedances are changed to a 9-O resistor in series with a 12-O inductive reactance.
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° .