# Department of Electrical and Computer Engineering University of

``` NAME ____________________________ Department of Electrical and Computer Engineering University of Idaho Moscow, Idaho 1. This is Exam #1 for ECE 420 for the Spring 2016 semester. 2. This exam consists of four problem groups on four pages and a cover sheet. 3. You have 50 minutes to complete this exam. 4. The format is open book and open notes. You may use a calculator and a desktop or laptop personal computer if you wish. If you have any computer results for which you want credit, please send them to the professor [email protected] Please place your name on each page and file for which you want credit. 5. Please answer the questions in the space provided. If you need more writing space, please use the back of the preceding sheet. If you want to present additional page(s) or computer files generated during the allotted exam period, clearly indicate in the original problem space that such additional material exists. Failure to make such a notation will normally cause the grader to ignore your additional work. 6. You may disassemble this exam if you wish. If you do so, please place your name on each separated page for which you want credit. Problem Maximum 1. _________ (20) AC Power 2. _________ (40) Three Phase Transformer 3. _________ (20) Three Phase AC Power Basics 4. _________ Total _________ (20) (100) AC Power Basics NAME ____________________________ 1. (20 points) AC Power. Consider the circuit shown below. It is an AC circuit, 60 Hertz, 120VAC rms single phase. Its output voltages are as shown. Impedances are given in Ohms. 0.18
j0.30
j0.24
0.18
j0.42
j0.30
+
j0.24 +
jXs
+
120 / 0&deg; V
+
-
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