exam1 S12 solutions

exam1 S12 solutions - ENME 350 Electronics and...

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Unformatted text preview: ENME 350 Electronics and Instrumentation I Spring 2012 Exam 1 (50 minutes) NOTE: Work 4 out of the 5 problems. Draw a line through the problem you do NOT want graded in the scoring table below as well as place an “X” through the pages of the problem. If we cannot figure out which problem you do NOT want graded, we will grade the first 4 problems. Name (first and last): SID: Problem Score 1 2 Section (or Lab day): 3 4 Name of Student to left: 5 Total Name of Student to right: Check the units of your results Copy answers into marked boxes on exam sheets Include your work for partial credit Closed book, closed notes (one page cheat sheet allowed) Calculators are allowed Turn off cell phones Take off caps and hats Leave bags, books in aisle Simplify numerical and algebraic results as much as possible. Be kind to the graders and write legibly. You will receive no credit for illegible results. No credit for multiple, differing answers to the same question. Write the full honor pledge in your own handwriting and sign it. I pledge on my honor that I have not given or received any unauthorized assistance on this examination. Signature: ___________________________________________________ Exam 1 Page 1 of 7 Prof. D. Barker ENME 350 Electronics and Instrumentation I Spring 2012 [25 pts] Short Anwer. Include Units Exam 1 Page 2 of 7 Prof. D. Barker ENME 350 Electronics and Instrumentation I Spring 2012 Problem 2 [25 pts]. Calculate Vth and Rth of the Thevenin equivalent for the circuit shown below in terms of the circuit elements V1, I1, I2, and R. Write down your intermediate results and simplify your answer. Exam 1 Page 3 of 7 Prof. D. Barker ENME 350 Electronics and Instrumentation I Spring 2012 Problem 3 [25 pts]. Calculate an algebraic expression for ix in terms of the circuit elements Vs and R. Write down your intermediate results and simplify your answer. Exam 1 Page 4 of 7 Prof. D. Barker ENME 350 Electronics and Instrumentation I Spring 2012 Problem 4 (25 pts). What is the current IA leaving the voltage source in terms of the circuit elements Vs, R1, R2, R3, and R4? (a) (15pts) Write down your intermediate answer for the circuit equivalent resistance, Req, in general form showing which resistors are in parallel and which are in series. Your answer should be in the form as we have been using in class, e.g. (R1+(R2||R3))||R4. Do not solve for your answer any further for this part of the problem! Exam 1 Page 5 of 7 Prof. D. Barker ENME 350 Electronics and Instrumentation I Spring 2012 (b) (7pts) After setting up the form of Req in part (a), solve for Req with the simplifying assumption that R1=R2=R3=R4=R. Simplify your answer (no fractions of fractions) (c) (3pts) Solve for IA with the above simplification in terms of R & VS. Exam 1 Page 6 of 7 Prof. D. Barker ENME 350 Electronics and Instrumentation I Spring 2012 Problem 5 [25 pts]. A battery, which can be modeled by a Thevenin equivalent circuit, has an open circuit voltage Vbatt. When a load resistor (RL) is connected across the battery terminals, the output voltage across the battery drops to V0 = 4Vbatt/5. How much power is dissipated in the Thevenin equivalent resistance of the battery in terms of Vbatt and RL? Write down your intermediate results and simplify your answer (no fractions of fractions). Exam 1 Page 7 of 7 Prof. D. Barker ...
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This note was uploaded on 04/05/2012 for the course ENME enme350 taught by Professor Hasouneh during the Spring '10 term at Maryland.

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