1) three phase power system has a 220 V line-to-line voltage. what is most nearly the line currents ?
2) three phase delta system has line to line cuurent of 4.5 A. What are most nearly the line currents ?
3) a parallel circut has a resistance of 20 ohm a capacitor of 20 uf and inductor of 20 mH . the circuit operataing at 60 Hz . what is the the paralel impednace ?
4 ) a transformer has an rms voltage input of 440 V and rms current input of 4 A . the secondary load dissapates 1600 W . the is nearly the percentage of effeciency ?
5) LC circuit has value of L= 22uH and C = 100 pf . what is the resonant frequency in Hz?
6) series RLC circuit has value of R = 10 ohm , XL= 6 j ohm, Xc =9j ohm , the circuit is driven by sinisoidal source of v(t)= 12 V . what is the peak current ?. including the current phase angle ?
7) A power system operates at rms voltage of 440 V and rms current of 3.5 A .the current lags the voltage by 12 degree. what is the reactive power ?
8) A power system operates at rms voltage of 440 V and rms current of 3.5 A .the current lags the voltage by 12 degree. how much power deleivered to the load ?