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Practice_Test_4

Practice_Test_4 - Color fl/ORY University of Arizona...

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Unformatted text preview: Color: fl/ORY University of Arizona Department of Electrical & Computer Engineering ECE 220 Basic Circuits Examination 1 VFebruary 14, 2003 V Closed book/notes, calculators allowed. Part I: 8 questions Part II: 8 questions. Part II is worth twice as much as Part I. On the SCANTRON write and bubble-in your: 1. Name (Last, first) 2. 1-3 digit ID number which is given on your exam paper. (Remember this ID for future exams.) Write this left-justified under columns A-C under IDENTIFICATION NUMBER. Write the color of your exam paper (IVORY or GREEN) on the top left margin of the SCANTRON. DJ Place your UA picture ID card on the adjacent desk where it can be easily seen. When the 9:00 bell rings, begin the examination. All work should be done on the examination paper. Allow for reasonable amounts of roundoff error, and carefully mark one choice for each problem on the SCANTRON answer sheet. A B C D E e.g. 1 (D @ . ® ® ifthe answer for Question 1 is C. All answer sheets and examinations will be collected at or before 9:55. You will be asked to stop writing and hand in your papers/answer sheets. Failure to comply promptly may result in disqualification from the exam. Remember this number: NAME: SIGNATURE: It will be used to post your ECE 220 grades throughout the semester. Part I. 10 mins I, A 3300 pF capacitor can also be specified as: (a) 0.33 pF (b) 33x109fF (c) 3.3 nF (d) 33 nF (6) None of these 2 . All resistors shown have value 3 Q. The equivalent resistance seen at terminals {a,b} is: (a) 5 Q a (b) 4.5 Q (c) 9 Q (d) 6 Q (e) None of these 3. How much power is the element absorbing? 3A _ .4:— (a) ~27 W (b) 27 W (c) 3 W 9V (d) -3 W (e) None of these + 4’. The value of voltage v is: + (a) 8 V 16 kQ (b) 6 V v 12 V (c) 4 V 8 k9 (d) 16 V - (6) None of these 5 The value ofthe current i0 is: 1:, (a) -20A 0'55 4—— (b) -5A ———W\/V— (c) 20A + 10V - (d) 5 A (e) None ofthese Part I. 10 mins (cani'rleL) b - The power dissipated in the 9 k0 resistor is: 9 k9 (a) 81 mW (b) 9 mW (c) 900 mW (d) 100 mW (e) None of these 6 1 k9 '7; . Kyle is in a potentially dangerous predicament. Which one of the following values of R will save him from electrocution? (a) 2 D (b) 5 Q R (c) 0.80 (d) 1.25 O 500 kV 1 Q g What is the value of V0 ? 4k§2 (a) -10 V (b) 22 V (c) 14 V (d) 10 V (e) None of these Part II. 40 mins q. After the switch is closed, the current is given by: i(t) = 2e—0‘“ A How much energy is absorbed by the circuit element during the first 5 seconds after the switch is closed? (a) 47.22 J (b) 56.78] (c) 32'5J Circuit (d) 18.58 J element (e) None of these I 0 c Find the power delivered by the 10 mA current source. (a) 50 11W (b) 75 pW (c) 100 “W (d) 150 “W (e) None of these 0.25 v0 10 mA i I Find the power dissipated in the 60-ohm resistor. (a) 45 W (b) 15 W (c) 3 W (d) 9 W (e) None ofthese 409 101 209 i 600 100v 90 f2 '2 . Find the value ofthe current i. (a) 2 A (b) 4 A (c) 4.5 A (d) 8A (e) None of these 120V SQ 6Q 3Q I 3‘ Find the value of the voltage v0. (a) 2.4V (b) 3.6V (c) 5.2V (d) 1.6V (6) None ofthese 300 mA 29 4Q I 9' Find Rab. (All resistances shown are in ohms.) (a) 8 0 (b) 160 4 (c) 11 Q a (d) 13.2 Q (6) None of these 10 2.6 [6- Find the voltage v0. (a) UV (b) 9V (c) -6V (d) 3V (6) None ofthese 16. (a) (b) (C) (d) (6) This meter has been designed to: measure currents of 0-1 A measure currents of 0-10 A measure voltages of 0—1 V measure voltages of 0-10 V None of these functions make sense for this meter l: ...
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