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Unformatted text preview: Department of Electrical and Computer Engineering The Johns Hopkins University 520.137 Introduction to Electrical and Computer Engineering Fall 2007 Examination II 1. There are 3 problems. You have 55 minutes . 2. Closed book. Closed notes. One 8 . 5 11 cheat sheet allowed. 3. Read the questions carefully. Make sure that you answer EVERY question posed. 4. Express your final answer in the most compact and simplified form. 5. Justify all of your answers. 6. State all of your assumptions if necessary. 7. Show your work clearly, neatly, and precisely. 8. Make sure that your name appears on every page of the exam booklet. I The control logic for a residential heating system is to perate as follows: during the daytime, heating is required only if the temperature falls below 68 o F. At night, heating is only required for temperatures below 62 o F. Assume that we receive the following three signals from the sensors: D : high during the day and low at night H : high only if the temperature is above 68...
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- Winter '06