# ex1f09 - ECE473 EXAM#1 FALL 2009 Instructions 1 Closed-book...

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ECE473 EXAM #1 FALL 2009 Instructions : 1. Closed-book, closed-notes, open-mind exam. 2. Work each problem on the exam booklet in the space provided. 3. Write neatly and clearly for partial credit. Cross out any material you do not want graded. Name : Problem 1 : /20 Problem 2 : /30 Problem 3 : /25 Problem 4 : /25 Total : /100 1

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Problem 1 (20 Points) I ~ + ~ 2 V =120 0 V o - 240-VA 0.96-pf lead Load 2.4 j61.8 + - V 1 ~ (a) Find the complex power ¯ S 2 = P 2 + jQ 2 (VA) absorbed by the load. (b) Find the line current ˜ I (A) in both polar and rectangular forms. (c) Find the source voltage ˜ V 1 (V) in polar form. (d) Find the complex power ¯ S 1 = P 1 + jQ 1 (VA) delivered by the source. 2
(30 Points) + ~ V 2 - I 1 ~ I 2 ~ Source Line Capacitor Load -j24 12 j12 j7 ~ + - V 1 Fill in the missing information in the table below for each load and for the total load supplied by the source. S

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ex1f09 - ECE473 EXAM#1 FALL 2009 Instructions 1 Closed-book...

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