Questions Bank of Electrical Circuits
Transcript of Questions Bank of Electrical Circuits
Questions Bank of Electrical Circuits
1. If a 100 resistor and a 60 XL are in series with a 115V applied voltage, what is the
circuit impedance?
2. A 50 XC and a 60 resistance are in series across a 110V source , Calculate the
impedance.
3. Find the impedance of a series R-C-L circuit, when R = 6 , XL = 20 , and XC
= 10
4. A 200 resistor, a 100 XL, and an 80 XC are placed in parallel across a
120V AC source (Figure 10). Find: (1) the branch currents, (2) the total current,
and (3) the impedance.
5. A 200 resistor and a 50 XL are placed in series with a voltage source, and the total
current flow is 2 amps. Find: 1. Pf 2. applied voltage, V 3. P 4. Q 5. S
6. A 600 resistor and 200 XL in Parallel R-L Circuit 200 XL are in parallel with a 440V
source Find: 1. IT 2. Pf 3. P 4. Q 5. S
7. An 80 Xc and a 60 resistance are in series with a 120V source, Find: 1. Z 2. IT 3. Pf 4. P
5. Q 6. S.
8. A 30 resistance and 40 XC are in parallel with a 120V power source, as shown in Figure
7. Find: 1. IT 2. Z 3. Pf 4. P 5. Q6. S.
9. An 800 resistance, 100 XL, and an 80 XC are in parallel with a 120V, 60Hz source,
Find: 1. IT 2. Pf 3. P 4. Q 5. S
10. Calculate the power dissipated when a current of 4 mA flows through a resistance of 5 k
11. The hot resistance of a 240 V filament lamp is 960 . Find the current taken by the lamp and
its power rating.
12. Find the equivalent resistance for the circuit shown in Figure .
13. For the series-parallel arrangement shown in Figure, find (a) the supply current, (b) the
current flowing
through each resistor and (c) the voltage across each resistor.
14. For the circuit shown in Figure calculate (a) the value of resistor Rx such that the total power
dissipated in the circuit
is 2.5 kW, and (b) the current flowing in each of the four resistors.
15. For the arrangement shown in Figure, find the current Ix
16. Find the current and voltages in each branch in the circuit shown in figure
50Ω
20Ω 30Ω 30Ω
10Ω
100 v
17. Find V1 and V2 shown in the circuit that shown in figure
40Ω
100 v
v1v2
18. Find Req in the circuit that shown in figure
100Ω
200Ω
10Ω
100Ω
100Ω
200Ω
Req
200Ω
100Ω
150Ω
150Ω
19. Find the value of current iA using Mesh Analysis in the circuit shown in figure
25Ω
5Ω 4.8A
5Ω 0.5 iA30Ω
iA
20. Find the current through 9ohm in the circuit that shown in figure
8A
8Ω
12Ω
3kΩ
9Ω 4Ω 5 v
21. What the value of resistance should be connected between terminal AB to draw a maximum
power in the circuit that shown in figure
+
- 4Ω 3Ω
1Ω 1Ω
5vx 9 v
+vx-
AB
22. Using Nodal Analysis find the voltages value in each branch that shown in figure
4A
25A28 v4Ω
2Ω 2Ω
2Ω
2Ω
23. Find Req in the circuit then find the total current that shown in figure
2Ω
10 v 4Ω
3Ω 2Ω
5Ω
1Ω
24. Use superposition theorem to find the current that shown in figure
DC
+
-
3Ω 12 v
2Ω
1Ω
2A 5 vx
2Ω
I
25. Determine Thevenin voltage and Rth at the terminal AB for the network that shown in figure
12A
4A
12Ω A
B
4Ω 3A
26. Find the current through 9 ohm using Thevenin in the circuit that shown in figure
4Ω
6Ω 10Ω 9Ω
12 v
0.2vx vx
27. Find R.M.S, Average and k-factor value for the shape that shown in figure
28. Find the RMS value, Average value, form factor and peak factor of the wave shown in figure
29. Find the value of RX which consume maximum power, then find Pmax in figure
30Ω
400 v
3Ω
15Ω
4Ω
10Ω
RX
30. find the value of current in the branch BE of the network shown in figure using mesh (Maxwell)
analysis.
31. find the current in (7Ω) in the circuit shown in figure using Norton Method.
3Ω
12Ω 300 v
8Ω 4Ω
7Ω 3Ω 50 A
32. for the circuit shown in figure find the value of E.
E
3Ω
30Ω 40Ω
60Ω
33. find the current in (22Ω) using Nodal Analysis in figure
34. In series R-L circuit consist of resistance 100 Ω and inductance 30mH with voltage across
220 volt, 50Hz. Determine:
Resultant current.
Power factor.
Power in VA.
Quality factor.
Voltage across R and L.
35. find the current in (27Ω) using Nodal Analysis in figure
36. find the current in (8 Ω) by using superposition method in figure
12Ω 5Ω
150A 80 v 3Ω 3Ω 8Ω
37. find RMS, Average values, form factor and peak factor in figure
38. find Req for the circuit shown in figure
10Ω
6Ω 8Ω 2Ω
12Ω 4Ω 100 v
39. find the current in (90Ω) for the circuit shown in figure by using Thevenin Theorem.
50 v
20Ω
33Ω
44Ω
12Ω
90Ω
40. A resistance of 80Ω, inductance of 5mH, and capacitance of 200µF connected in series
across 100v and 50 Hz. Determine:
Impedance .
Current.
Power factor.
Voltage across R, L, C.
Power in VA.
V(t)
2 4 6
t
20
41. find Req between A and B for the circuit shown in figure
60Ω 5kΩ
10Ω 30Ω
200Ω
30Ω
10Ω 60Ω
10Ω
Req
A
B
42. using nodal analysis find the currents in the figure
43. find the currents in the circuit shown by kirchoffs law.
44. Find the current in each resistor using mesh method.
45. Find the current in each resistor using nodal analysis.
46. Find the current in each resistance by using super position theorem.
47. Find the current in 60 ohm by using thevenin.
48. Find the current in 5ohm using Norton method.
49. A 50 XC and a 60 resistance are in series across a 110V source Calculate the
impedance.
50. A 200 resistor, a 100 XL, and an 80 XC are placed in parallel across a120V AC
source .Find: (1) the branch currents, (2) the total current, and (3) the impedance.
51. A series circuit has a 50Ώ, a 75 Ώ, and a 100 Ώ resistor in series Find the voltage necessary
to produce a current of 0.5 amps.
52. Find the total resistance of a 4Ohm, an 8Ohm, and a 16Ohm resistor in parallel
53. Find the current in a circuit (Figure below) by using Kirchhoff’s voltage law
54. Find I2 in the circuit shown in Figure Below using Kirchhoff’s voltage and current laws.
55. Find i1 and i2! If i1 and i2 is the direction of electron flow
56. Find i1 and i2! If i1 and i2 is the direction of current flow
57. Find Vx by applying Kirchhoff voltage loop at loop 1 and loop 2. For simplifying use this
equation: i1 − i2 = 2 A.
58. Find I4
59. A 10μF capacitor is connected in series to a 120V, 60Hz power source Find the capacitive
reactance and the current flowing in the circuit. Draw the phasor diagram.
60. Using super position method find the current in 30kΩ.
61. Using mesh analysis method find the current in 20kΩ.
62. Using nodal analysis method find the current in 40Ω.
63. Using nodal analysis method find the current in 5Ω.
25Ω
5Ω 4.8A
5Ω 0.5 iA30Ω
iA
64. Find the power in the figure below using thevenin method.
25Ω
5Ω 4.8A
5Ω 0.5 iA30Ω
iA
65. Using nodal analysis method find the current in 5Ω.
12Ω 5Ω
150A 80 v 3Ω 3Ω 8Ω
66. Using superposition method find the current in 22Ω.
67. Using thevenin method find the current in 1Ω.
2Ω
10 v 4Ω
3Ω 2Ω
5Ω
1Ω
68. Using superposition method find the current in 22Ω.
4Ω
6Ω 10Ω 9Ω
12 v
0.2vx vx
69. Using superposition method find the current in 22Ω.
3Ω
12Ω 300 v
8Ω 4Ω
7Ω 3Ω 50 A
70. Find the value of R1, RL and L if you know that the value of VL= 150volt and the current flow the circuit is 1.5 A
with angle 55 lagging.
AC
R1 RLXL
VL220<0
50Hz
71. Find Req for the circuit shown below.
DC
60v
20Ω 15kΩ
10Ω
18Ω
15kΩ
72. Find the value of R, L and C if you know that the value of VR is 100 volt and the value of VL is 100
volt and the value of Vc is 20 volt when you know that the value of current through circuit 7A with angle 30 leading.
AC
L
C
220<0
50Hz
R
73. Find Thevenin equivalent between A and B.
74. Find Thevenin equivalent in 2 ohm.
75. Find Norton equivalent in 4k ohm.
76. Find Thevenin equivalent in 7 ohm.
77. Find Norton equivalent in 7 ohm.
78. Find the current in 5 ohm using super position theory.
79. Find the current in 220 ohm using super position theory.
80. Find the currents in the circuit shown below using super position theory.