222 - EE 234: Electronics & Microcontrollers
First Major Exam
Wednesday, Feb 15, 2023, at 6:00 - 7:30 PM (H)
Student Name:
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Q
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Ans
D
E
B
A
A
D
B
D
C
B
D
D
D
E
C
Q1. The power, and energy transferred from t = 0 to t =10 s of the following element, respectively, are
A)
B)
C)
D)
E)
200 − 20𝑡 W, 1000 J
−200 − 20𝑡 W, 1000 J
200 − 20𝑡 W, − 1000 J
−200 + 20𝑡 W, − 1000 J
200 + 20𝑡 W, − 1000 J
Q2. The voltages 𝑣𝑎 , 𝑣𝑏 , and 𝑣𝑐 in the following circuit, respectively, are
A)
B)
C)
D)
E)
−5 V, −25 V, 35 V
−5 V, 25 V, 35 V
5 V, −25 V, −35 V
5 V, 25 V, −35 V
5 V, −25 V, 35 V
Q3. The power of the voltage source 𝑉𝑆 in the following circuit is
A)
B)
C)
D)
E)
−48 W
48 W
−64 W
64 W
36 W
2
Q4. The value of 𝐼𝑥 in the following circuit is
A)
B)
C)
D)
E)
12 A
9A
−12 A
−9 A
6A
Q5. The node-voltage equations of the following circuit in matrix form are
0.45
(A) [−0.25
0
−0.25
0.85
−0.2
𝑣1
0
−3.5
−0.2] [𝑣2 ] = [ 3.5 ]
0.3 𝑣3
2
0.45
(B) [ 0.6
0
0.45
(C) [−0.25
0
−0.25
0.75
−0.2
𝑣1
0
−3.5
−0.2] [𝑣2 ] = [ 3.5 ]
0.3 𝑣3
2
0.45
(D) [−0.25
0
0.45
(E) [−0.25
0
−0.25
0.85
−0.2
𝑣1
0
−3.5
𝑣
]
[
2 ] = [ 3.5 ]
−0.2
−0.1 𝑣3
2
−0.25
0.85
−0.2
−0.25
0.85
−0.2
𝑣1
0
−3.5
−0.2] [𝑣2 ] = [ 3.5 ]
0.3 𝑣3
2
0 𝑣1
−3.5
0.4] [𝑣2 ] = [ 3.5 ]
0.3 𝑣3
2
Q6. The value of the mesh current I2 in the following circuit is
A)
B)
C)
D)
E)
2.75 A
-4.75 A
-2 A
4.75 A
2A
3
Q7. The value of the Thevenin voltage (Vt) in the following circuit (between points a, b) is
A)
B)
C)
D)
E)
12 V
-12 V
-18 V
-5 V
18 V
Q8. The value of the Norton current in the following circuit (between points a, b) is
A)
B)
C)
D)
E)
-1 A
1A
-3 A
3A
9/6 A
Q9. Find RL for maximum power transfer from the circuit below. Also, find the maximum power of RL
A)
B)
C)
D)
E)
2 Ω, -4.5 W
6 Ω, 4.5 W
2 Ω, 4.5 W
2 Ω, 9 W
9 Ω, 4.5 W
4
Q10. The node-voltage equation of V1 in the following circuit is
1
1
4
1
2
1
4
1
2
1
4
1
2
1
A) 𝑉1 ( +
B) 𝑉1 ( +
C) 𝑉1 ( +
D) 𝑉1 ( +
4
2
1
6
1
6
1
6
1
6
1
6
1
6
1
+ ) − 𝑉2 ( ) = 4
+ ) + 𝑉2 ( ) = 4
+ ) − 𝑉2 ( ) = 4
6
1
1
4
2
E) −𝑉1 ( +
1
+ ) − 𝑉2 ( ) = −4
3
1
1
6
6
+ ) − 𝑉2 ( ) = 4
Q11. Find the mesh currents in the following circuit
A) 𝑖1 = 2.364 A, 𝑖2 = 1.118 A
B) 𝑖1 = −2.364 A, 𝑖2 = 1.818 A
C) 𝑖1 = 3.364 A, 𝑖2 = 1.818 A
D) 𝑖1 = 2.364 A, 𝑖2 = 1.818 A
E) 𝑖1 = 2.98 A, 𝑖2 = 1.818 A
Q12. Determine V in the following circuit (you may combine the resistance series/parallel)
A)
B)
C)
D)
E)
1/5 V
6V
2V
−2 V
−1/3 V
5
Q13. For the following circuit, the value for 𝑅 that makes the equivalent resistor 𝑅eq = 50 Ω is
(A)
(B)
(C)
(D)
(E)
𝑅 = 41 Ω
𝑅 = 12 Ω
𝑅=8 Ω
𝑅 = 16 Ω
𝑅 =4Ω
Q14. Find the power dissipated in the 5 Ω resistor in the following figure
(A)
(B)
(C)
(D)
(E)
𝑃 = 42 W
𝑃 = 50 W
𝑃 = 60 W
𝑃 = 100 W
𝑃 = 80 W
Q15. Find 𝑖0 in the circuit shown below (you may use source transformation)
(A)
(B)
(C)
(D)
(E)
𝑖0 = 409.3 mA
𝑖0 = −409.3 mA
𝑖0 = 636.4 mA
𝑖0 = −636.4 mA
𝑖0 = 119.7 mA
6
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