# ex1f11 - ECE473 EXAM #1 FALL 2011 Instructions: 1....

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EXAM #1 FALL 2011 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 : /20 Problem 4 : /30 Total : /100 Single-Phase AC Circuits : ˜ V = ¯ Z ˜ I = | ˜ V || ˜ I | ̸ ϕ, ϕ = θ v - θ i ¯ S = P + jQ = ˜ V ˜ I = | ˜ V || ˜ I | ̸ ϕ = ¯ Z | ˜ I | 2 = | ˜ V | 2 ¯ Z S = P 2 + Q 2 = V I = ZI 2 = V 2 Z P = V I cos ϕ = RI 2 = V 2 R Q = V I sin ϕ = XI 2 = V 2 X Three-Phase AC Circuits : ¯ Z = 3 ¯ Z Y S 3 ph = 3 V LN I L = 3 V LL I L P 3 ph = 3 V LN I L cos ϕ = 3 V LL I L cos ϕ Q 3 ph = 3 V LN I L sin ϕ = 3 V LL I L sin ϕ ˜ V AB = ( 3 ̸ 30 o ) ˜ V AN , ˜ V BC = ( 3 ̸ 30 o ) ˜ V BN , ˜ V CA = ( 3 ̸ 30 o ) ˜ V CN ˜ I aA = ( 3 ̸ - 30 o ) ˜ I AB , ˜ I bB = ( 3 ̸ - 30 o ) ˜ I BC , ˜ I cC = ( 3

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## This document was uploaded on 11/01/2011 for the course ECE 473 at Boise State.

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ex1f11 - ECE473 EXAM #1 FALL 2011 Instructions: 1....

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