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ECE320_SS09_Exam_1a_solutions

# ECE320_SS09_Exam_1a_solutions - ECE 320 Energy Conversion...

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1 ECE 320: Energy Conversion and Power Electronics Exam 1 February 9, 2009 Prof. Tim Hogan Print your name: Student ID #: Question Score 1 2 3 4 Total Prefixes 10 12 tera T 10 9 giga G 10 6 mega M 10 3 kilo k 10 -3 milli m 10 -6 micro μ 10 -9 nano n 10 -12 pico p 10 -15 femto f 10 -18 atto a This exam is out of 100 points. Read through the exam before starting and feel free to do the easier parts first. Show your work. Careful of units.

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1 Problem #1: Matching & True/False 20 points Match the Property in the left column to the Phrase in the right column by placing the appropriate letter from the Property column in the boxes provided. Each Property can be used any number of times, such that some letters might not be used, while others could be used more than once . (2 points each) Property Phrase A) Impedance Required condition for Y Z Z 3 = Δ B) Phasor Ratio of flux linkage to current. C) Three Phase Assumed to be zero for magnetic circuits studied in this class. D) Faraday’s Law The capacity for retaining magnetism after the magnetizing force has been removed. E) Retentivity Stores energy in the form of a magnetic field. F) Inductor or Inductance G) Displacement Current H) Balanced I) Permeability K) Coersivity L) Ampere’s Law M) Flux Linkage N) Power Factor Answer true or false to the following statements by circling the correct answer (2 points per question). True False In an electrical power system the apparent power supplied to the system by the source(s) is equal to the sum of apparent power of the load(s) and transmission line(s).

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ECE320_SS09_Exam_1a_solutions - ECE 320 Energy Conversion...

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