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ECE320_SS09_Exam_3a_solutions

# ECE320_SS09_Exam_3a_solutions - ECE 320 Energy Conversion...

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1 ECE 320: Energy Conversion and Power Electronics Exam 3 April 13, 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 . (3 points each) Property Phrase A) Squirrel-Cage Rotor Used to spatially modify the magnetomotive force (MMF) of a specific coil. B) Slip Torque of a motor is directly proportional to this, and the speed of the motor is inversely proportional to this. C) Number of Poles The most common form of induction motors has this configuration. D) Wound Rotor In the design of ac machines, this is used to minimize the higher-order harmonic components and to produce an air-gap flux that consists predominantly of the space-fundamental sinusoidal component. E) Efficiency F) Torque G) Generator

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