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Unformatted text preview: ECE 430 Exam #1, Spring 2009 Name: _____Solution_________________ 90 Minutes Section (Check One) MWF _______ TTH _______ 1. ________ / 25 2. ________ / 25 3. ________ / 25 4. _________ / 25 Total ________ / 100 Useful information ( 29 ( 29 sin cos 90 x x = o V ZI = * S VI = 3 3 L L S V I φ θ = ∠ 180 (lag) 180 0 (lead) θ θ < < < < o o 3 (delta) 3 (wye) L L I I V V φ φ = = /3 Y Z Z ∆ = 7 4 10 H/m μ π = ⋅ C S da ⋅ = ⋅ ∫ ∫ H dl J n C S da t ∂ ⋅ =  ⋅ ∂ ∫ ∫ E dl B n l A μ ℜ = MMF Ni φ = = ℜ B A φ = Li N λ φ = = 1 2 M k L L = 1 hp = 746 Watts 1. (25 points) Three singlephase loads are connected in parallel. The load voltage is ( 29 v 283sin 120 load t π = . The load characteristics are: Load #1: 100 Amps at 0.8 power factor lag Load #2: 8 KW at 0.7 power factor lag Load #3: ( 29 5 2 j + Ω The impedance of each of the two wires that serves this combination of loads is ( 29 0.1 0.1 j + Ω ....
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This note was uploaded on 10/24/2010 for the course ECE ECE 430 taught by Professor Sauer,p during the Fall '08 term at University of Illinois, Urbana Champaign.
 Fall '08
 Sauer,P

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