EE362L_Summer05_Tests - VERSION 2 (V2) 75 minute test. Ten...

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VERSION 2 (V2) 75 minute test. Ten multiple choice questions. One 8.5x11” note sheet permitted (both sides). No laptop computers. No credit for guessing - you must show sufficient reasoning, equations, and steps to justify your answer. Circle the correct answer. I intended for the correct answer to be one of the choices, but if not, then choose “other” (if provided) and write in your answer. Do not unstaple. Synchronized starting. Seating assignments. No partial credit. If you finish more than 15 minutes early, quietly turn in your test. Else, wait until the end of class to avoid disturbing others. Problem 1. A MOSFET is operating with 5W of average power loss. The MOSFET is mounted on a heat sink that has a thermal coefficient of 2.0°C rise/W. The ambient temperature of the room is 30°C. The heat sink temperature is monitored by a thermistor (10k @ 25°C) whose resistance variation is shown in the table below. Compute the resistance of the thermistor at the operating condition described. Temp T - ºC RT/R(T=25ºC) 0 3.28 5 2.55 10 1.993 15 1.573 20 1.250 25 1.000 30 0.806 35 0.653 40 0.532 45 0.437 50 0.360 55 0.298 a. 6530 b. 4370 c. 3600 d. 5320 e. Other _________________ Problem 2. A 2,500μF capacitor is charged to 32V and then connected across a load resistor R. The response is shown on the oscilloscope snapshot below. Compute the resistance of load resistor R.
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This note was uploaded on 04/03/2012 for the course EE 462 taught by Professor Grady during the Fall '11 term at University of Texas at Austin.

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EE362L_Summer05_Tests - VERSION 2 (V2) 75 minute test. Ten...

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