Unit 4                                                             

2270                                                      PRACTICE EXAM                                                             

 

1.      (30 points)

a.   Calculate the value of rms current, Irms, flowing through zL.

b.   Calculate the complex power, S, for zL. Include appropriate units.

 

2.      (30 points)

Balanced three-phase, positive-sequence system

IaA = 15 ∠ 0°A                        Zg = (0.2 + j0.2)Ω

VaA = 22.5 ∠ 53.13°V            ZΔ = (30 + j24)Ω

a.   Draw a single-phase equivalent circuit.

b.   Calculate IAB.

3.      (40 points)

a.   Write a numerical time-domain expression for the current i(t).

 

b.   Calculate V1.