Spring-2023_Exam-232_V1_Answers

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Clemson University *

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2020

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Electrical Engineering

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Dec 6, 2023

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pdf

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Uploaded by ProfessorCamel3094

1 ECE-2020 Exam #2 February 28, 2023 Version #1 General Instructions: 1) This is a multiple-choice exam. Work out any analytical problems on scrap paper, Circle the answer on your exam sheet, and finally, Mark the answer on your OMR Answer Sheet. Turn in your completed OMR Answer Sheet only. 2) For all problems choose the answer choice that is closest to the answer that you have calculated; often times answers will be rounded to the nearest integer or tenth’s place. 3) Fill out the Scan sheet with your Last Name, First Initial, Middle Initial, and CUID Number. 4) Course Number is 2020. Section is 01. 5) There are multiple versions of this Exam. Your exam version is listed at the top of this page. Write the Version number in the blank space on your OMR Answer Sheet, near the Clemson Tiger in the upper left-hand corner. When turning in your OMR Answer Sheet, place it in the location corresponding to your Version number. If you get this wrong, your exam will be graded automatically with respect to the wrong answer key, and thus you will fail the exam! 6) The exam is closed note and closed book. You can bring one sheet of equations. 7) Be sure to fill in the proper circle corresponding to the Exam question number. YOUR NAME: Please Print: _____________________________________________________

2 ECE-2020 Exam #2 February 28, 2023 Version #1 1) Using the defined nodes and reference node shown for the circuit in Figure 1, calculate the node 1 voltage, v 1 . Figure 1 a) ࠵ౣ࠵? 1 = 144 ࠵౉࠵? b) ࠵ౣ࠵? 1 = 72.5 ࠵౉࠵? c) ࠵ౣ࠵? 1 = 100 ࠵౉࠵? d) ࠵ౣ࠵? 1 = − 20.5 ࠵౉࠵? e) None of the above 2) Using the defined nodes and reference node shown for the circuit in Figure 1, calculate the node 2 voltage, v 2 . a) ࠵ౣ࠵? 2 = 20 ࠵౉࠵? b) ࠵ౣ࠵? 2 = 15 ࠵౉࠵? c) ࠵ౣ࠵? 2 = 30.0 ࠵౉࠵? d) ࠵ౣ࠵? 2 = − 20.5 ࠵౉࠵? e) None of the above 3) Given the following three Node voltage equations, what is the voltage, V 3 ? 30 ࠵౉࠵? 1 − 3 ࠵౉࠵? 2 − 20 ࠵౉࠵? 3 = 150 50 ࠵౉࠵? 1 + 8 ࠵౉࠵? 2 − 58 ࠵౉࠵? 3 = 0 − 20 ࠵౉࠵? 1 − 5 ࠵౉࠵? 2 + 42 ࠵౉࠵? 3 = 150 a) ࠵౉࠵? 3 = − 5 ࠵౉࠵? b) ࠵౉࠵? 3 = − 4 ࠵౉࠵? c) ࠵౉࠵? 3 = 7 .5 ࠵౉࠵? d) ࠵౉࠵? 3 = 9.5 ࠵౉࠵? e) None of the above

3 4) For the Circuit in Figure 2, determine the number of essential nodes. Figure 2 a) 8 Essential Nodes b) 3 Essential Nodes c) 11 Essential Nodes d) 4 Essential Nodes e) None of the above 5) For the Circuit in Figure 2, determine the total number of unique branch currents, including known as well as unknown currents. a) 8 Branch Currents b) 11 Branch Currents c) 7 Branch Currents d) 4 Branch Currents e) None of the above 6) For the Circuit in Figure 2, Node Voltages 1, 2, & 3 are defined, and the reference node is on the bottom of the circuit as indicated. Indicate the valid Nodal expression for Node 1. a) ࠵౉࠵? 1 −࠵౉࠵? ࠵ె࠵? ࠵౅࠵? 0 +࠵౅࠵? 1 + ࠵౉࠵? 1 ࠵౅࠵? 2 + ࠵౉࠵? 1 −࠵౉࠵? 2 ࠵౅࠵? 3 − ࠵఼࠵? ࠵ె࠵? = 0 b) ࠵౉࠵? 1 − ࠵౉࠵? 3 − ࠵౉࠵? ࠵ె࠵? ࠵౅࠵? 0 + ࠵౅࠵? 1 + ࠵౉࠵? 1 − ࠵౉࠵? 3 ࠵౅࠵? 2 + ࠵౉࠵? 1 − ࠵౉࠵? 2 ࠵౅࠵? 3 − ࠵఼࠵? ࠵ె࠵? = 0 c) ࠵౉࠵? 1 −࠵౉࠵? ࠵ె࠵? ࠵౅࠵? 1 + ࠵౉࠵? 1 ࠵౅࠵? 2 +࠵౅࠵? 4 + ࠵౉࠵? 1 −࠵౉࠵? 2 ࠵౅࠵? 3 − ࠵఼࠵? ࠵ె࠵? = 0 d) ࠵౉࠵? 1 = ࠵౉࠵? ࠵ె࠵? − ࠵౉࠵? 0 e) None of the above

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