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Unformatted text preview: Name_______________________________ SID___________________________________ University of California, Berkeley – College of Engineering Department of Electrical Engineering and Computer Sciences Summer 2011 Instructor: Neel Shah 2011-07-08 Last Name Key First Name Solution Student ID Number Name of the person to your left Name of the person to your right All the work is my own. I had no prior knowledge of the exam contents nor will I share the contents with others in EE40 who have not taken it yet. I have not cleverly hidden notes and/or computational devices that give me an unfair advantage. (please sign) Instructions: • You have 100 minutes to complete this exam, which we’ll start at 12:15 PM. Once time is out at 1:55 PM, we’ll announce that time is up, and you should stop writing immediately. The exact times will depend on when we can get everyone settled in. • There are 10 pages on the exam. All work should be on this exam. Don’t hand in random sheets of paper. • Please turn off anything that might make noise, unless it is necessary for you to stay alive. Remove all hats and headphones. Allow at least one empty seat between your neighbor and you. All backpacks, laptops, and jackets should be up front, and nothing should be in the seats or on the floor between you and your neighbors. • Calculators are allowed and recommended, but cell phone calculators are not. • You may use 1 page of notes (8.5” x 11” or A4), front and back, handwritten or typed, no magnifying glasses! • Partial credit will be given for incomplete answers, so please show your work. The best possible thing you can do if you start running out of time is to write out things like the correct node voltage equations for problems you haven’t completed. • If you get stuck on an algebra problem, move on! The numerical part of a problem will be worth less than the conceptual part! • This is a hard test, but hopefully not too hard! If the average is too low, remember that we’re going to nudge grades up if we went too hard on you and wrote problems that were too difficult. Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Total Earned Max 25 25 50 50 50 200 Name_______________________________ SID___________________________________ Problem 1. Short Answer a) Why don’t birds get electrocuted when they sit on high-voltage power lines? How could they get electrocuted? Birds sit with both of their feet on the same power line. This places both of their feet at the same voltage. Thus no current flows through their body. If they place one foot on a different power line than another, then they risk electrocution, since their feet may be at different voltages and a lethal current may pass through their body....
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