SolutionExamThree2040Spring09

SolutionExamThree2040Spring09 - SOLUTIONS Third Exam ECE...

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SOLUTIONS Third Exam ECE 2040d Spring 2009 Name:___________________________________________ INSTRUCTIONS: 1. Closed book, three pages (front and back) of notes, and calculator allowed. 2. Write answers on answer sheet on ONE SIDE ONLY, in order. 3. Staple answer sheets to back of this test (include this sheet). 4. One hour and 20 minutes will be allowed for the exam. 5. Exams must be handed in before time is up. Exams handed in after that time will have 3 points deducted. Problem Worth Grade 1a 20 1b 20 2 20 3a 20 3b 20 Total 100
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1. Consider the power line model below. The frequency of the source is 50 Hz. (a) Give the power factor of the load. The power factor is () () Z ang cos where Z is the impedance of the load, and ( ) Z ang is the angle of the impedance. In this problem 30 30 j Z + = , so the angle is 4 / π , so the power factor is () 2 / 1 4 / cos = = ρ . (b) Find the value of the capacitor, such that if placed across nodes a and b, would make the load have a power factor of 0.97 lagging.
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This note was uploaded on 09/17/2009 for the course ECE 2025 taught by Professor Juang during the Spring '08 term at Georgia Tech.

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SolutionExamThree2040Spring09 - SOLUTIONS Third Exam ECE...

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