4 Problems on Power Circuits and Electromechanics with Solution - Exam | ECE 430, Exams of Electrical and Electronics Engineering

Download 4 Problems on Power Circuits and Electromechanics with Solution - Exam | ECE 430 and more Exams Electrical and Electronics Engineering in PDF only on Docsity! Sat UTions ECE330 Name, Exam #1 {Print Name) Spring 2004 Section: (Circle One) 10 MWF 2MWE (Sauer) (Kimball) Problem 1 Problem 2 Problem 3 Problem 4 TOTAL: USEFUL INFORMATION Sen xs los (X-109) Zy= 3 2 S357 2, LE -_ -~-a% > Ve2I SevLk (HP 2 146 W 0464 180° bay ~1g0°£ OF DO Leos ts (Tenda ede 2-4 (8. - ‘ $8 > [gede Gee aden D2 4h Ty (setts) __ -7 =~ yt sgrxto Hf A= Azuge be mer" 0 ae  Problem 1 (25 pts.) A single-phase source with a voltage of 157 cos (377t + 15°) Volts is serving two single- phase loads in parallel. The first load consumes 800 Watts of real power and 400 Vars of reactive power. The second load is an impedance with magnitude 14 Ohms and angle 20 degrees. a) Find the time-domain currents into each load. b) Find the total complex power supplied by the source. c) Find the value of a capacitor (in Farads) that you could add as a third load in parallel to provide all the reactive power consumed by the two other loads. d) What would the time-domain source current be when the capacitor is added? _ be 5400 4y /2b4° ] a i, = * ~— JM CEE . G06 alle" Hy fas tig Lt UB 06 Sz Cos (274-11, 6%) HU" ° Jz = Tyee * 7,43 1S Uy = 243 Se los (9924 —-*) x (bs 3 8604 i400 4 mide (2.4 ls): Poesi¢ou + §8O/ 20% = Sooritoos $2745 301 = M6274 70/7 = 77) (227° (c\ el SHI 2 77e. = SLE (a) 7-[22 Ne res LS? ny pis? Ce nes a C3324 415°)