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ECE 20100 – Fall 2017

Exam #1

September 19, 2017

Sections (include on scantron)

Ersoy (8:30) – 0002 Hosseini (3:30) – 0004 Michelusi (4:30) – 0005

Peleato-Inarrea (11:30) – 0011 Lin (2:30) – 0012

Elliott (10:30) – 0013 Kildishev (10:30) – 0014

Name ____________________________ PUID____________

Instructions

1. DO NOT START UNTIL TOLD TO DO SO.

2. Write your name, section, professor, and student ID# on your Scantron sheet. We may check PUIDs.

3. This is a CLOSED BOOKS and CLOSED NOTES exam.

4. The use of a TI-30X IIS calculator is allowed, but not necessary.

5. If extra paper is needed, use the back of test pages.

6. Cheating will not be tolerated and will be dealt with according to the policy in your section. In

particular, continuing to write after the exam time is up is regarded as cheating.

7. If you cannot solve a question, be sure to look at the other ones, and come back to it if time permits.

8. All of the problems on Exam #1 provide evidence for satisfaction of this ECE 20100 Learning

Objective:

i) An ability to analyze linear resistive circuits.

The minimum score needed to satisfy this objective will be posted on Blackboard after the exam has

been graded. Remediation options will be posted in Blackboard if you fail to satisfy any of the course

outcomes.

By signing the scantron sheet, you affirm you have not received or provided assistance

on this exam.

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Question 1

Find the voltage VAB (in V).

(1) 1

(2) 2

(3) 3

(4) 4

(5) 5

(6) 6

(7) 7

(8) 8

(9) 9

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Question 2

In the circuit below, the dependent voltage source absorbs 3W of power. Find the resistance of

the resistor (in ).

(1) 1

(2) 1/2

(3) 1/3

(4) 1/4

(5) 2/3

(6) 3/4

(7) 2

(8) 3

(9) None of the above

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Question 3

In the circuit shown, determine the current through the 200 resistor (in mA).

1) 10

2) 20

3) 30

4) 40

5) 50

6) 100

7) 200

8) 0

9) Impossible to answer

10) None of the above

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Question 4

In the circuit shown below, find the voltage Vo (in mV).

1) 10

2) 20

3) 30

4) 40

5) 50

6) 100

7) 200

8) 0

9) None of the above

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Question 5

Find the equivalent resistance as shown in the figure if all resistors have the value R .

(1) R/8

(2) R/4

(3) R/2

(4) R

(5) 2R

(6) 4R

(7) 8R

(8) None of the above

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Question 6

Which of the following resistor combinations is NOT possible? Note: VBA = −5 V.

(1) R1 = 1 , R2 = 1

(2) R1 = 0 , R2 = 2

(3) R1 = 0.5 , R2 = 0.5

(4) R1 = 0.5 , R2 = 1.5

(5) R1 = 2 , R2 = 0

(6) None of the above

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Question 7

For the circuit below, find the current Ix (in A).

(1) 1

(2) 2

(3) 3

(4) 0.1

(5) 0.2

(6) 0.3

(7) 0.4

(8) None of the above

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Question 8

In the circuit below, find nodal voltage VC (in V).

(1) 1

(2) 2

(3) 3

(4) 4

(5) 5

(6) 6

(7) 7

(8) None of the above

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Question 9

What is the current, I (in A), through the 3 resistor in the figure?

(1) 5

(2) –5

(3) 3

(4) –3

(5) 2

(6) –2

(7) 1

(8) –1

(9) None of the above

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Question 10

Find the mesh equations of the loops shown below.

(1) 2I1 – 3I2 = 5, −3I1 + 5I2 = 24

(2) 2I1 + 3I2 = 5, 3I1 − 5I2 = 24

(3) 2I1 + 3I2 = 5, −3I1 + 5I2 = 24

(4) 4I1 + 3I2 = 5, 3I1 + 9I2 = −24

(5) 4I1 + 3I2 = 5, 3I1 − 9I2 = 24

(6) 4I1 – 3I2 = 5, 3I1 + 9I2 = −24

(7) 4I1 – 3I2 = 5, −3I1 + 9I2 = −24

(8) None of the above

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Question 11

Using superposition to determine Vout, identify which of the following voltage pairs is correct

(Vo1 is the output voltage with the 6V source inactive and Vo2 is the output voltage with the 0.5A

source inactive.)

(1) Vo1 = 1.5 V; Vo2 = −1 V

(2) Vo1 = −1.5 V; Vo2 = 1 V

(3) Vo1 = 0.5 V; Vo2 = −1 V

(4) Vo1 = 1.5 V; Vo2 = 0 V

(5) Vo1 = −1.5 V; Vo2 = 0 V

(6) Vo1 = 0 V; Vo2 = 2 V

(7) Vo1 = 0 V; Vo2 = −2 V

(8) None of the above

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Question 12

Use source transformation to determine the current i in the circuit below. The current i is (in A):

(1) 1

(2) 2

(3) 3

(4) 4

(5) –1

(6) –2

(7) –3

(8) –4

(9) None of the above