10/20/21, 5:32 PM
Pre-test: Attempt review
Engineering and IT
EEMS - Electrical Energy & Mobility Systems
2021WS-M1-Electrical Engineering
 Dashboard /Courses /CUAS Campus /2021WS /EngIT /EEMS_M_0673 /2021WS-M1-EE /Exams /Pre-test
Started on Mittwoch, 20 Oktober 2021, 4:01
State
Finished
Completed on Mittwoch, 20 Oktober 2021, 5:31
Time taken 1 hour 30 mins
Grade 10.0 out of 100.0
Question 1
Correct
Mark 10.0 out of 10.0
How many branches, nodes, and independent loops (meshes) has the circuit below?
(count elements in series as one branch!)
Number of branches:
4

Number of nodes:
2

Number of independent loops (meshes):
3

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Question 2
Incorrect
Mark 0.0 out of 16.0
Determine the Thevenin-equivalent circuit on the pins a and b; calculate the load current.
Use the following numbers:
V1 = 10 V, I1 = 9 A, R1 = 8 Ω, R2 = 4 Ω, R3 = 6 Ω, RL = 2 Ω
Enter the results with an accuracy of ± 1% with three significant digits (use a point as decimal separator):
Thevenin resistor RTh (in Ω):
1.5

One possible correct answer is: 4
Thevenin voltage VTh (in V):
1.111 
One possible correct answer is: 27.333333333333
Load current IL (in A):
0.555 
One possible correct answer is: 4.5555555555556
The answer is wrong.

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Question 3
Not answered
Marked out of 12.0
Calculate the current through a 3 mH inductor, if the voltage across it is measured as v (t ) = 5 sin(322t + 38°) V .
Enter the result with an accuracy of ± 1% with three significant digits (use a point as decimal separator); phases as angle between -180° and
+180°:
I=
/
°A

One possible correct answer is: 5.175983436853, -142
The answer is wrong.
Question 4
Not answered
Marked out of 16.0
Calculate the voltage gain vo /vi.
Your numbers are:
R1 = 11 kΩ, R2 = 8 kΩ, R3 = 400 kΩ, R4 = 6 kΩ
Enter the result with an accuracy of ± 1% with three significant digits (use a point as decimal separator):
Voltage gain vo /vi :

One possible correct answer is: 16.012987012987
The answer is wrong.

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Question 5
Not answered
Marked out of 16.0
Calculate the node voltages V1, V2, and V3 (suitable method: Node-Voltage analysis).
Your numbers are:
I1 = 4 A, I2 = 3 A, R1 = 4 Ω, R2 = 4 Ω, R3 = 6 Ω, R4 = 6 Ω
Enter the results with an accuracy of ± 1% with three significant digits (use a point as decimal separator):
Voltage V1 (in V):

One possible correct answer is: 11.5
Voltage V2 (in V):

One possible correct answer is: 4
Voltage V3 (in V):

One possible correct answer is: -1.25
The answer is wrong.

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Pre-test: Attempt review
Question 6
Incorrect
Mark 0.0 out of 16.0
The switch in the circuit has been open for a long time. At t = 0 it is closed. Calculate v (t ) for t > 0.
Your numbers are:
V1 = 5 V, V2 = 47 V, R1 = 5 Ω, R2 = 4 Ω, C = 0.7 F
Enter the result with an accuracy of ± 1% with three significant digits (use a point as decimal separator):
v (t ) = [ 3.8
+ 5
· exp(-t / 2.8
) ]
V

One possible correct answer is: -23.888888888889, 28.888888888889, 1.5555555555556
The answer is wrong.

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Question 7
Not answered
Marked out of 14.0
Calculate the values of the three resistors, if the y parameters are given.
The y parameters are:
0.6
−0.1
−0.1
0.6
[y] = [
] S
Enter the results with an accuracy of ± 1% with three significant digits (use a point as decimal separator):
Resistor R1 (in Ω):

One possible correct answer is: 2
Resistor R2 (in Ω):

One possible correct answer is: 10
Resistor R3 (in Ω):

One possible correct answer is: 2
The answer is wrong.
◄ Module FEE-11: Sinusoids and Phasors
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